/* ============================================
   刘豪豪技术站 - 资料下载 & 学习分享
   Design System Styles
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.cn/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700&family=Fira+Code:wght@400;500;600&display=swap');

/* ========== CSS Variables ========== */
:root {
  --bg-primary: #1B2E4B;
  --bg-card: rgba(30, 58, 95, 0.65);
  --bg-card-solid: #1E3A5F;
  --python-blue: #3776AB;
  --python-yellow: #FFD43B;
  --ai-cyan: #00D9FF;
  --text-primary: #ECEFF4;
  --text-secondary: #B0B8C8;
  --text-dim: #7E8A9E;
  --border-glow: rgba(0, 217, 255, 0.22);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow-blue: 0 0 20px rgba(55, 118, 171, 0.3);
  --shadow-glow-cyan: 0 0 20px rgba(0, 217, 255, 0.3);
  --shadow-glow-yellow: 0 0 20px rgba(255, 212, 59, 0.3);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;
  --font-code: 'Fira Code', monospace;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--ai-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--python-yellow);
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--python-blue); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--ai-cyan); }

/* ========== Particle Canvas ========== */
#particle-canvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

.grid-bg {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 217, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 217, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ========== Navigation ========== */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  padding: 0 2rem; height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glow);
  transition: background var(--transition-normal);
}
.navbar.scrolled {
  background: rgba(10, 14, 26, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-logo {
  display: flex; align-items: center; gap: 12px; cursor: pointer;
}
.nav-logo svg { width: 40px; height: 40px; }

.nav-logo-text {
  font-family: var(--font-heading);
  font-size: 1rem; font-weight: 700;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: 1px;
}
.nav-logo-id {
  font-family: var(--font-code);
  font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.5px;
}

.nav-links {
  display: flex; align-items: center; gap: 0; list-style: none;
}
.nav-links a {
  display: block; padding: 0.5rem 1.2rem; font-size: 0.9rem;
  font-weight: 500; color: var(--text-secondary); position: relative;
  transition: color var(--transition-fast);
}
.nav-links a:hover, .nav-links a.active { color: var(--ai-cyan); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 50%;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--python-blue), var(--ai-cyan));
  transition: width var(--transition-normal), left var(--transition-normal);
}
.nav-links a:hover::after { width: 70%; left: 15%; }
.nav-links a.active::after {
  width: 90%; left: 5%; height: 3px;
  box-shadow: 0 0 10px rgba(0,217,255,0.8), 0 0 25px rgba(0,217,255,0.4), 0 0 50px rgba(0,217,255,0.15);
  animation: navActivePulse 2s ease-in-out infinite;
}
.nav-links a.active {
  text-shadow: 0 0 12px rgba(0,217,255,0.7), 0 0 35px rgba(0,217,255,0.3);
  font-weight: 700; letter-spacing: 0.5px;
}
.nav-links a::before {
  content: ''; position: absolute; top: 50%; left: 50%;
  width: 0; height: 0; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,217,255,0.15), transparent);
  transform: translate(-50%,-50%);
  transition: width 0.4s, height 0.4s;
  pointer-events: none; z-index: -1;
}
.nav-links a.active::before {
  width: 130%; height: 220%;
  background: radial-gradient(circle, rgba(0,217,255,0.2), rgba(0,217,255,0.05), transparent);
  animation: navActiveGlow 2s ease-in-out infinite alternate;
}
.nav-links a:hover::before { width: 100%; height: 160%; }
.nav-links a.active::before {
  width: 130%; height: 220%;
  background: radial-gradient(circle, rgba(0,217,255,0.2), rgba(0,217,255,0.05), transparent);
  animation: navActiveGlow 2s ease-in-out infinite alternate;
}
@keyframes navActivePulse {
  0%, 100% { box-shadow: 0 0 10px rgba(0,217,255,0.8), 0 0 25px rgba(0,217,255,0.4); }
  50% { box-shadow: 0 0 15px rgba(0,217,255,1), 0 0 35px rgba(0,217,255,0.6), 0 0 60px rgba(0,217,255,0.2); }
}
@keyframes navActiveGlow {
  0% { background: radial-gradient(circle, rgba(0,217,255,0.2), rgba(0,217,255,0.05), transparent); }
  100% { background: radial-gradient(circle, rgba(0,217,255,0.3), rgba(0,217,255,0.08), transparent); }
}

/* ── 灵豆AI·智能体 菜单 HOT 徽章 ── */
.nav-ai-link {
  display: inline-flex !important;
  align-items: center;
  gap: 0;
}
.nav-hot-badge {
  display: inline-block;
  font-size: 0.55rem;
  font-weight: 800;
  font-family: 'Orbitron', monospace;
  letter-spacing: 1px;
  color: #0a0e1a;
  background: linear-gradient(135deg, #FFD43B, #F59E0B);
  padding: 1px 5px;
  border-radius: 4px;
  margin-left: 5px;
  line-height: 1.4;
  position: relative;
  animation: hotPulse 2s ease-in-out infinite;
  box-shadow: 0 0 6px rgba(255,212,59,0.4), 0 0 12px rgba(255,212,59,0.15);
}
.nav-hot-badge::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 6px;
  background: linear-gradient(135deg, #FFD43B, #FF6B6B, #00D9FF, #FFD43B);
  background-size: 300% 300%;
  z-index: -1;
  animation: hotBorderFlow 3s linear infinite;
  opacity: 0.6;
}
@keyframes hotPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 6px rgba(255,212,59,0.4), 0 0 12px rgba(255,212,59,0.15); }
  50% { transform: scale(1.1); box-shadow: 0 0 10px rgba(255,212,59,0.7), 0 0 20px rgba(255,212,59,0.3), 0 0 30px rgba(255,107,107,0.15); }
}
@keyframes hotBorderFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.nav-mobile-btn {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 4px; background: none; border: none;
}
.nav-mobile-btn span {
  display: block; width: 24px; height: 2px;
  background: var(--text-secondary); transition: var(--transition-fast); border-radius: 2px;
}

/* ========== Hero Section ========== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 6rem 2rem 4rem; z-index: 1;
}
.hero-content { max-width: 800px; animation: heroFadeIn 1s ease-out; }
.hero-logo {
  max-width: 320px; margin: 0 auto 2rem;
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-glow-cyan);
  animation: logoPulse 3s ease-in-out infinite;
  border: 2px solid rgba(0, 217, 255, 0.3);
  background: rgba(10, 25, 47, 0.5);
}
.hero-logo img { width: 100%; height: auto; object-fit: contain; display: block; }
.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, 3rem); font-weight: 800; letter-spacing: 2px;
  margin-bottom: 0.8rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--ai-cyan) 50%, var(--python-yellow) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-secondary); margin-bottom: 0.5rem; font-weight: 300;
}

/* ========== ID特效: Harold.Liu | AI 技术分享 ========== */
.hero-id-fx {
  display: inline-flex; align-items: center; gap: 12px;
  margin-bottom: 2rem; padding: 0.5rem 1.2rem;
  background: rgba(0, 217, 255, 0.04);
  border: 1px solid rgba(0, 217, 255, 0.12);
  border-radius: 100px;
  position: relative;
}
.hero-id-name {
  font-family: var(--font-heading);
  font-size: 1.15rem; font-weight: 700; letter-spacing: 2px;
  background: linear-gradient(135deg, #3776AB 0%, #00D9FF 40%, #00D9FF 60%, #3776AB 100%);
  background-size: 200% auto;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: nameShimmer 3s linear infinite;
  text-shadow: none;
  filter: drop-shadow(0 0 8px rgba(0, 217, 255, 0.4));
}
.hero-id-sep {
  width: 1px; height: 18px;
  background: linear-gradient(180deg, transparent, var(--ai-cyan), transparent);
  position: relative;
}
.hero-id-sep::before {
  content: ''; position: absolute;
  top: -3px; left: -2px; width: 5px; height: 5px;
  background: var(--ai-cyan); border-radius: 50%;
  animation: sepBlink 2s ease-in-out infinite;
  box-shadow: 0 0 8px var(--ai-cyan);
}
.hero-id-tag {
  font-family: var(--font-body);
  font-size: 0.95rem; font-weight: 500; letter-spacing: 1px;
  color: var(--python-yellow);
  text-shadow: 0 0 10px rgba(255, 212, 59, 0.5);
  animation: tagGlow 2.5s ease-in-out infinite;
  position: relative;
}


@keyframes nameShimmer {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}
@keyframes sepBlink {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--ai-cyan); }
  50% { opacity: 0.3; box-shadow: 0 0 2px var(--ai-cyan); }
}
@keyframes tagGlow {
  0%, 100% { text-shadow: 0 0 10px rgba(255, 212, 59, 0.5); }
  50% { text-shadow: 0 0 20px rgba(255, 212, 59, 0.8), 0 0 40px rgba(255, 212, 59, 0.3); }
}


.hero-desc {
  font-size: 1rem; color: var(--text-secondary);
  max-width: 600px; margin: 0 auto 2.5rem; line-height: 1.8;
}
.hero-actions {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0.75rem 1.8rem; font-size: 0.9rem; font-weight: 600;
  font-family: var(--font-body); border: none; border-radius: var(--radius-md);
  cursor: pointer; transition: all var(--transition-normal);
  position: relative; overflow: hidden;
}
.btn::before {
  content: ''; position: absolute; top: 50%; left: 50%;
  width: 0; height: 0; background: rgba(255, 255, 255, 0.15);
  border-radius: 50%; transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}
.btn:active::before { width: 300px; height: 300px; }

.btn-primary {
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  color: #fff; box-shadow: var(--shadow-glow-blue);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(0, 217, 255, 0.4); }

.btn-secondary {
  background: transparent; color: var(--ai-cyan);
  border: 1px solid rgba(0, 217, 255, 0.4);
}
.btn-secondary:hover { background: rgba(0, 217, 255, 0.1); transform: translateY(-2px); border-color: var(--ai-cyan); }

.btn-yellow {
  background: linear-gradient(135deg, var(--python-yellow), #f59e0b);
  color: #1B2E4B; box-shadow: var(--shadow-glow-yellow);
}
.btn-yellow:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(255, 212, 59, 0.4); }

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
}
.btn-danger:hover { transform: translateY(-2px); box-shadow: 0 0 20px rgba(239, 68, 68, 0.3); }

.btn-sm { padding: 0.5rem 1.2rem; font-size: 0.85rem; }

/* ========== Section Common — 科技扫描线 ========== */
.section { position: relative; z-index: 1; padding: 5rem 2rem; }
.section::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 80%; max-width: 900px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,217,255,0.2), rgba(55,118,171,0.3), rgba(0,217,255,0.2), transparent);
}
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-tag {
  font-family: var(--font-code); font-size: 0.8rem; color: var(--ai-cyan);
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 0.5rem; opacity: 0.8;
  position: relative; display: inline-block;
}
.section-tag::before, .section-tag::after {
  content: ''; position: absolute; top: 50%; width: 20px; height: 1px;
  background: var(--ai-cyan); opacity: 0.4;
}
.section-tag::before { right: calc(100% + 8px); }
.section-tag::after { left: calc(100% + 8px); }
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700;
  color: var(--text-primary); margin-bottom: 0.8rem;
  position: relative; display: inline-block;
}
.section-title::after {
  content: ''; display: block; width: 60px; height: 2px; margin: 0.6rem auto 0;
  background: linear-gradient(90deg, var(--python-blue), var(--ai-cyan));
  border-radius: 1px;
}
.section-desc {
  font-size: 0.95rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto;
}

/* ========== Glass Card — 科技扫描线特效 ========== */
.glass-card {
  background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow); border-radius: var(--radius-lg);
  padding: 1.5rem; transition: all var(--transition-normal);
  position: relative; overflow: hidden;
}
.glass-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), transparent);
  opacity: 0; transition: opacity var(--transition-normal);
}
.glass-card::after {
  content: ''; position: absolute; top: -100%; left: 0; right: 0; height: 60%;
  background: linear-gradient(180deg, rgba(0,217,255,0.06), transparent);
  opacity: 0; transition: opacity 0.4s, top 0.6s cubic-bezier(0.25,0.8,0.25,1);
  pointer-events: none;
}
.glass-card:hover {
  transform: translateY(-4px); border-color: rgba(0, 217, 255, 0.3);
  box-shadow: var(--shadow-card), var(--shadow-glow-cyan);
}
.glass-card:hover::before { opacity: 1; }
.glass-card:hover::after { opacity: 1; top: 100%; }

/* ========== Download Section ========== */
.download-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem; max-width: 1200px; margin: 0 auto;
}
.download-card-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.download-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.download-icon.cloud {
  background: linear-gradient(135deg, rgba(55, 118, 171, 0.2), rgba(0, 217, 255, 0.2));
  color: var(--ai-cyan);
}
.download-icon.local {
  background: linear-gradient(135deg, rgba(255, 212, 59, 0.2), rgba(245, 158, 11, 0.2));
  color: var(--python-yellow);
}
.download-card-title { font-weight: 700; font-size: 1.05rem; color: var(--text-primary); }
.download-card-meta { font-size: 0.8rem; color: var(--text-dim); margin-top: 2px; }
.download-card-desc { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 1.2rem; line-height: 1.6; }
.download-card-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.tag { display: inline-block; padding: 0.2rem 0.6rem; font-size: 0.75rem; border-radius: var(--radius-sm); font-weight: 500; }
.tag-blue { background: rgba(55, 118, 171, 0.15); color: var(--python-blue); border: 1px solid rgba(55, 118, 171, 0.3); }
.tag-cyan { background: rgba(0, 217, 255, 0.1); color: var(--ai-cyan); border: 1px solid rgba(0, 217, 255, 0.2); }
.tag-yellow { background: rgba(255, 212, 59, 0.1); color: var(--python-yellow); border: 1px solid rgba(255, 212, 59, 0.2); }
.download-card-actions { display: flex; gap: 0.8rem; align-items: center; }
.download-card-actions .btn { flex: 1; justify-content: center; min-width: 0; }

/* ========== Upload Section ========== */
.upload-area { max-width: 800px; margin: 0 auto; }
.upload-dropzone {
  border: 2px dashed rgba(0, 217, 255, 0.3); border-radius: var(--radius-xl);
  padding: 3rem 2rem; text-align: center; cursor: pointer;
  transition: all var(--transition-normal); position: relative;
  background: rgba(0, 217, 255, 0.02);
}
.upload-dropzone:hover, .upload-dropzone.drag-over {
  border-color: var(--ai-cyan); background: rgba(0, 217, 255, 0.06);
  box-shadow: inset 0 0 30px rgba(0, 217, 255, 0.05);
}
.upload-dropzone.drag-over { animation: borderPulse 1.5s ease-in-out infinite; }
.upload-dropzone-icon { font-size: 3rem; margin-bottom: 1rem; color: var(--ai-cyan); opacity: 0.6; }
.upload-dropzone-text { font-size: 1.1rem; color: var(--text-primary); margin-bottom: 0.5rem; }
.upload-dropzone-hint { font-size: 0.85rem; color: var(--text-dim); }
.upload-file-input { display: none; }
.upload-progress-list { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 0.8rem; }
.upload-progress-item {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.8rem 1rem; background: var(--bg-card);
  border-radius: var(--radius-md); border: 1px solid var(--border-glow);
}
.upload-progress-icon { font-size: 1.2rem; flex-shrink: 0; }
.upload-progress-info { flex: 1; min-width: 0; }
.upload-progress-name {
  font-size: 0.88rem; font-weight: 500; color: var(--text-primary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.upload-progress-bar { height: 4px; background: rgba(255, 255, 255, 0.1); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.upload-progress-bar-fill {
  height: 100%; background: linear-gradient(90deg, var(--python-blue), var(--ai-cyan));
  border-radius: 2px; transition: width 0.3s ease; width: 0%;
}
.upload-progress-status { font-size: 0.8rem; font-family: var(--font-code); flex-shrink: 0; }
.upload-progress-status.uploading { color: var(--ai-cyan); }
.upload-progress-status.done { color: #10b981; }
.upload-progress-status.error { color: #ef4444; }
.upload-progress-remove {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; font-size: 1rem; padding: 4px;
  transition: color var(--transition-fast); flex-shrink: 0;
}
.upload-progress-remove:hover { color: #ef4444; }


/* ========== Video Page Layout ========== */
.vp-layout {
  display: flex; gap: 1.5rem; max-width: 1280px;
  margin: 0 auto; align-items: flex-start; padding: 0 1rem 3rem;
}
.vp-player-col { flex: 1; min-width: 0; }
.vp-playlist-col { width: 340px; flex-shrink: 0; }

/* Player Card */
.vp-player-card {
  background: rgba(17, 24, 39, 0.75);
  border: 1px solid var(--border-glow);
  border-radius: 16px; overflow: hidden;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.03);
}
.vp-player-wrap { position: relative; background: #000; }
.vp-player {
  width: 100%; display: block;
  aspect-ratio: 16 / 9; background: #000; outline: none;
}
.vp-player-overlay {
  position: absolute; inset: 0; display: flex;
  align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  cursor: pointer; transition: background 0.3s;
}
.vp-player-overlay:hover { background: rgba(0, 0, 0, 0.2); }
.vp-overlay-icon {
  width: 72px; height: 72px; border-radius: 50%;
  background: rgba(0, 217, 255, 0.15); backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 217, 255, 0.3);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.2);
  transition: transform 0.3s, box-shadow 0.3s;
}
.vp-player-overlay:hover .vp-overlay-icon {
  transform: scale(1.1);
  box-shadow: 0 0 50px rgba(0, 217, 255, 0.35);
}

/* URL Bar */
.vp-url-bar {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.25);
  border-top: 1px solid rgba(0, 217, 255, 0.06);
}
.vp-url-field {
  flex: 1; display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px; transition: border-color 0.2s;
}
.vp-url-field:focus-within {
  border-color: rgba(0, 217, 255, 0.3);
  box-shadow: 0 0 0 2px rgba(0, 217, 255, 0.06);
}
.vp-url-input {
  flex: 1; min-width: 0; border: none; background: none; outline: none;
  font-size: 0.82rem; font-family: var(--font-code);
  color: var(--text-primary);
}
.vp-url-input::placeholder { color: var(--text-dim); }
.vp-url-load, .vp-url-file {
  display: flex; align-items: center; gap: 0.35rem;
  padding: 0.5rem 1rem; font-size: 0.8rem; font-weight: 600;
  border: none; border-radius: 10px; cursor: pointer;
  transition: all 0.2s; white-space: nowrap;
}
.vp-url-load {
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  color: #fff;
}
.vp-url-load:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0, 217, 255, 0.3); }
.vp-url-file {
  background: rgba(255, 212, 59, 0.08);
  border: 1px solid rgba(255, 212, 59, 0.15);
  color: var(--python-yellow);
}
.vp-url-file:hover { background: rgba(255, 212, 59, 0.14); border-color: rgba(255, 212, 59, 0.35); }

/* Now Playing */
.vp-now-playing {
  margin-top: 0.8rem; padding: 0.65rem 1rem;
  background: rgba(17, 24, 39, 0.5);
  border: 1px solid var(--border-glow);
  border-radius: 12px; backdrop-filter: blur(12px);
}
.vp-np-status { display: flex; align-items: center; gap: 0.6rem; }
.vp-np-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #6B7280; flex-shrink: 0;
}
.vp-np-dot.playing {
  background: #22C55E;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
  animation: pulse-dot 1.5s infinite;
}
.vp-np-dot.paused { background: #F59E0B; box-shadow: 0 0 6px rgba(245, 158, 11, 0.4); }
.vp-np-dot.ended { background: #6B7280; }
.vp-np-label {
  font-size: 0.82rem; color: var(--text-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* Playlist Card */
.vp-playlist {
  background: rgba(17, 24, 39, 0.75);
  border: 1px solid var(--border-glow);
  border-radius: 16px; overflow: hidden;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.03);
  position: sticky; top: 90px;
  max-height: calc(100vh - 110px);
  display: flex; flex-direction: column;
}
.vp-pl-header {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid rgba(0, 217, 255, 0.08);
  background: rgba(0, 217, 255, 0.02);
  position: relative; overflow: hidden;
}
.vp-pl-title-row {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.92rem; font-weight: 600; color: var(--text-primary);
}
.vp-pl-count {
  margin-left: auto; font-size: 0.72rem;
  font-family: var(--font-code); color: var(--ai-cyan);
  background: rgba(0, 217, 255, 0.08);
  padding: 0.15rem 0.5rem; border-radius: 6px;
  border: 1px solid rgba(0, 217, 255, 0.12);
}
.vp-pl-scanline {
  position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), transparent);
  animation: scanline-move 3s linear infinite;
}
@keyframes scanline-move {
  0% { opacity: 0.3; } 50% { opacity: 0.8; } 100% { opacity: 0.3; }
}

/* Playlist Items */
.vp-pl-list {
  flex: 1; overflow-y: auto; padding: 0.5rem;
  scrollbar-width: thin; scrollbar-color: rgba(0,217,255,0.15) transparent;
}
.vp-pl-list::-webkit-scrollbar { width: 3px; }
.vp-pl-list::-webkit-scrollbar-track { background: transparent; }
.vp-pl-list::-webkit-scrollbar-thumb { background: rgba(0,217,255,0.15); border-radius: 2px; }

.vp-pl-item {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.7rem 0.8rem; border-radius: 10px;
  cursor: pointer; transition: all 0.25s ease;
  border: 1px solid transparent; position: relative;
  margin-bottom: 0.3rem;
}
.vp-pl-item:hover {
  background: rgba(0, 217, 255, 0.05);
  border-color: rgba(0, 217, 255, 0.12);
}
.vp-pl-item.active {
  background: rgba(0, 217, 255, 0.08);
  border-color: rgba(0, 217, 255, 0.25);
  box-shadow: 0 0 16px rgba(0, 217, 255, 0.06);
}
.vp-pl-item.active::before {
  content: ''; position: absolute; left: 0; top: 50%;
  transform: translateY(-50%); width: 3px; height: 55%;
  background: linear-gradient(180deg, var(--ai-cyan), var(--python-blue));
  border-radius: 0 3px 3px 0;
  box-shadow: 0 0 8px rgba(0, 217, 255, 0.4);
}
.vp-pl-idx {
  width: 30px; height: 30px; border-radius: 8px;
  background: rgba(0, 217, 255, 0.04);
  border: 1px solid rgba(0, 217, 255, 0.08);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-size: 0.7rem;
  font-weight: 700; color: var(--text-dim); flex-shrink: 0;
  transition: all 0.25s ease;
}
.vp-pl-item.active .vp-pl-idx {
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  border-color: transparent; color: #fff;
  box-shadow: 0 0 12px rgba(0, 217, 255, 0.35);
}
.vp-pl-item:hover .vp-pl-idx {
  border-color: rgba(0, 217, 255, 0.2); color: var(--ai-cyan);
}
.vp-pl-info { flex: 1; min-width: 0; }
.vp-pl-title {
  font-size: 0.84rem; font-weight: 500; color: var(--text-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  line-height: 1.3; transition: color 0.2s;
}
.vp-pl-item.active .vp-pl-title { color: var(--ai-cyan); }
.vp-pl-item:hover .vp-pl-title { color: var(--text-primary); }
.vp-pl-meta {
  display: flex; align-items: center; gap: 0.5rem;
  margin-top: 0.25rem; flex-wrap: wrap;
}
.vp-pl-dur {
  display: flex; align-items: center; gap: 0.25rem;
  font-size: 0.7rem; color: var(--text-dim);
  font-family: var(--font-code);
}
.vp-pl-dur svg { opacity: 0.5; }
.vp-pl-play-btn {
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(0, 217, 255, 0.06);
  border: 1px solid rgba(0, 217, 255, 0.1);
  display: flex; align-items: center; justify-content: center;
  color: var(--ai-cyan); flex-shrink: 0;
  opacity: 0; transform: scale(0.8);
  transition: all 0.25s ease;
}
.vp-pl-item:hover .vp-pl-play-btn,
.vp-pl-item.active .vp-pl-play-btn {
  opacity: 1; transform: scale(1);
}
.vp-pl-item.active .vp-pl-play-btn {
  background: rgba(0, 217, 255, 0.12);
  border-color: rgba(0, 217, 255, 0.3);
  box-shadow: 0 0 10px rgba(0, 217, 255, 0.15);
}
.vp-pl-empty {
  padding: 3rem 1rem; text-align: center; color: var(--text-dim);
}
.vp-pl-empty p { margin: 0.8rem 0 0.3rem; font-size: 0.9rem; }
.vp-pl-empty span { font-size: 0.78rem; opacity: 0.5; }

/* Responsive */
@media (max-width: 960px) {
  .vp-layout { flex-direction: column; }
  .vp-playlist-col { width: 100%; }
  .vp-playlist { position: static; max-height: 400px; }
}
@media (max-width: 520px) {
  .vp-url-bar { flex-wrap: wrap; }
  .vp-url-field { min-width: 100%; order: 1; }
  .vp-url-load, .vp-url-file { flex: 1; justify-content: center; }
  .vp-playlist { max-height: 320px; }
}
/* ========== Video Featured Grid (Homepage) ========== */
.video-featured-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem; max-width: 1200px; margin: 0 auto;
}
.video-featured-card {
  position: relative; border-radius: 14px; overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border-glow);
  backdrop-filter: blur(12px); transition: all 0.4s cubic-bezier(0.22,1,0.36,1);
  text-decoration: none !important; color: inherit !important;
  display: flex; flex-direction: column;
}
.video-featured-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--ai-cyan);
  box-shadow: 0 12px 40px rgba(0,217,255,0.18), 0 0 0 1px rgba(0,217,255,0.15);
}
.video-featured-card::after {
  content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%;
  background: linear-gradient(180deg, transparent 0%, rgba(0,217,255,0.06) 50%, transparent 100%);
  opacity: 0; transition: opacity 0.6s; pointer-events: none; z-index: 1;
}
.video-featured-card:hover::after { opacity: 1; top: 0; }
.video-featured-thumb {
  position: relative; width: 100%; aspect-ratio: 16/9;
  background: linear-gradient(135deg, rgba(0,217,255,0.08) 0%, rgba(55,118,171,0.12) 50%, rgba(255,212,59,0.06) 100%);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.video-featured-thumb::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(0,217,255,0.1) 0%, transparent 60%);
  opacity: 0; transition: opacity 0.4s;
}
.video-featured-card:hover .video-featured-thumb::before { opacity: 1; }
.video-featured-thumb .play-btn {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(0,217,255,0.15); backdrop-filter: blur(8px);
  border: 2px solid rgba(0,217,255,0.3);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.4s cubic-bezier(0.22,1,0.36,1);
  position: relative; z-index: 2;
}
.video-featured-thumb .play-btn svg {
  width: 22px; height: 22px; fill: var(--ai-cyan); margin-left: 3px;
  filter: drop-shadow(0 0 6px rgba(0,217,255,0.5)); transition: all 0.3s;
}
.video-featured-card:hover .play-btn {
  background: var(--ai-cyan); border-color: var(--ai-cyan);
  box-shadow: 0 0 30px rgba(0,217,255,0.5), 0 0 60px rgba(0,217,255,0.2);
  transform: scale(1.12);
}
.video-featured-card:hover .play-btn svg { fill: #0a192f; margin-left: 3px; filter: none; }
.video-featured-duration {
  position: absolute; bottom: 8px; right: 8px; z-index: 2;
  background: rgba(0,0,0,0.7); backdrop-filter: blur(4px);
  padding: 2px 8px; border-radius: 4px; font-size: 0.75rem;
  color: #fff; font-family: var(--font-code); font-weight: 500;
}
.video-featured-info {
  padding: 1.2rem 1.4rem; flex: 1; display: flex; flex-direction: column; gap: 0.4rem;
  position: relative; z-index: 2;
}
.video-featured-title {
  font-size: 1rem; font-weight: 700; color: var(--text-primary);
  line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 1;
  -webkit-box-orient: vertical; overflow: hidden; transition: color 0.3s;
}
.video-featured-card:hover .video-featured-title { color: var(--ai-cyan); }
.video-featured-desc {
  font-size: 0.85rem; color: var(--text-muted); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.video-featured-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: auto; padding-top: 0.4rem; }

/* ========== About Section ========== */
.about-area { max-width: 900px; margin: 0 auto; }
.about-card { display: flex; gap: 2rem; align-items: flex-start; }
.about-avatar {
  width: 220px; min-height: 110px; border-radius: var(--radius-lg);
  flex-shrink: 0; border: 2px solid var(--border-glow);
  overflow: hidden; box-shadow: var(--shadow-glow-blue);
  background: rgba(10, 25, 47, 0.6); display: flex; align-items: center; justify-content: center;
}
.about-avatar img { width: 100%; height: 100%; object-fit: contain; }
.about-info h3 { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.3rem; }
.about-info .about-role { font-size: 0.95rem; color: var(--python-blue); font-weight: 500; margin-bottom: 0.2rem; }
.about-info .about-id-fx {
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: 1rem; font-size: 0.85rem;
}
.about-info .about-id-name {
  font-family: var(--font-heading); font-weight: 600;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.about-info .about-id-sep { color: var(--text-dim); }
.about-info .about-id-tag { color: var(--python-yellow); font-weight: 500; }
.about-info .about-bio { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 1.2rem; }
.about-skills { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.skill-tag {
  padding: 0.3rem 0.8rem; font-size: 0.8rem; border-radius: var(--radius-sm);
  background: rgba(0, 217, 255, 0.08); border: 1px solid rgba(0, 217, 255, 0.15);
  color: var(--ai-cyan); transition: all var(--transition-fast);
}
.skill-tag:hover { background: rgba(0, 217, 255, 0.15); border-color: rgba(0, 217, 255, 0.3); }

/* ========== About Preview (Homepage) ========== */
.about-preview { max-width: 900px; margin: 0 auto; }
.about-preview-card { display: flex; gap: 2rem; align-items: flex-start; }
.about-preview-avatar {
  width: 200px; min-height: 100px; border-radius: var(--radius-lg);
  overflow: hidden; flex-shrink: 0;
  border: 2px solid rgba(0, 217, 255, 0.2);
}
.about-preview-avatar img { width: 100%; height: 100%; object-fit: contain; }
.about-preview-info h3 {
  font-size: 1.4rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.4rem;
}
.about-preview-en {
  font-size: 0.9rem; color: var(--ai-cyan); font-weight: 400; margin-left: 0.5rem;
  font-family: var(--font-heading);
}
.about-preview-role {
  font-size: 0.9rem; color: var(--python-yellow); margin-bottom: 0.8rem;
  padding-left: 0.8rem; border-left: 3px solid var(--python-yellow);
}
.about-preview-bio {
  font-size: 0.92rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 1.2rem;
}
.about-preview-skills { display: flex; gap: 0.6rem; flex-wrap: wrap; }
/* ========== Section More Link (AI科技风) ========== */
.section-more {
  display: flex;
  justify-content: center;
  margin-top: 2.5rem;
}
.more-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 2rem;
  font-family: var(--font-code);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  letter-spacing: 0.08em;
  border: 1.5px solid var(--cyan);
  border-radius: 6px;
  background: rgba(0, 217, 255, 0.06);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.more-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.15), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}
.more-link:hover::before {
  transform: translateX(100%);
}
.more-link:hover {
  background: rgba(0, 217, 255, 0.12);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.3), inset 0 0 20px rgba(0, 217, 255, 0.05);
  transform: translateY(-2px);
  text-shadow: 0 0 8px rgba(0, 217, 255, 0.6);
}
.more-link-deco {
  color: var(--python-blue);
  font-weight: 700;
  transition: color 0.3s;
}
.more-link:hover .more-link-deco {
  color: var(--cyan);
  text-shadow: 0 0 6px rgba(0, 217, 255, 0.5);
}
.more-link svg {
  transition: transform 0.3s, filter 0.3s;
}
.more-link:hover svg {
  transform: translateX(4px);
  filter: drop-shadow(0 0 4px rgba(0, 217, 255, 0.6));
}

/* 科技风扫描线动画 */
.more-link::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--cyan), transparent);
  animation: scanLine 3s ease-in-out infinite;
  opacity: 0.6;
}
@keyframes scanLine {
  0% { left: -5%; opacity: 0; }
  20% { opacity: 0.6; }
  80% { opacity: 0.6; }
  100% { left: 105%; opacity: 0; }
}

.about-preview .section-more { margin-top: 1.5rem; }

/* ========== Articles Section ========== */
.articles-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem; max-width: 1200px; margin: 0 auto;
}
.article-card { cursor: pointer; transition: transform var(--transition-normal), box-shadow var(--transition-normal); }
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow-cyan); }
.article-card-date {
  font-family: var(--font-code); font-size: 0.78rem;
  color: var(--text-dim); margin-bottom: 0.6rem;
}
.article-card-title {
  font-size: 1.1rem; font-weight: 700; color: var(--text-primary);
  margin-bottom: 0.6rem; line-height: 1.4;
}
.article-card-excerpt {
  font-size: 0.88rem; color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 1rem;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card-footer {
  display: flex; align-items: center; justify-content: space-between;
}
.article-card-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }

/* ========== Article Detail Modal ========== */
.detail-modal { max-width: 800px; max-height: 85vh; display: flex; flex-direction: column; }
.detail-body { overflow-y: auto; padding: 0 0.5rem; flex: 1; }
.detail-meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border-glow); flex-wrap: wrap; }
.detail-date { font-family: var(--font-code); font-size: 0.82rem; color: var(--text-dim); }
.detail-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.detail-content { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.9; margin-bottom: 2rem; min-height: 120px; }
.detail-interactions { border-top: 1px solid var(--border-glow); padding-top: 1.5rem; margin-top: 0.5rem; }

/* ========== Interaction Bar ========== */
.interaction-bar { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.interact-btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.45rem 0.85rem; border-radius: 20px;
  border: 1px solid var(--border-glow); background: rgba(30, 58, 95, 0.4);
  color: var(--text-secondary); font-size: 0.82rem; cursor: pointer;
  transition: all var(--transition-fast); position: relative; overflow: visible;
}
.interact-btn:hover { border-color: var(--ai-cyan); color: var(--ai-cyan); background: rgba(0, 217, 255, 0.08); }
.interact-btn.interact-activated { transform: scale(1.15); }
.interact-btn:active { transform: scale(0.92); }
.interact-btn svg { flex-shrink: 0; transition: transform 0.3s ease; }
.interact-btn:active svg { transform: scale(1.3); }

.interact-like:hover, .interact-like.interact-activated { color: #FF6B6B; border-color: #FF6B6B; background: rgba(255, 107, 107, 0.1); box-shadow: 0 0 16px rgba(255, 107, 107, 0.25); }
.interact-flower:hover, .interact-flower.interact-activated { color: #FF69B4; border-color: #FF69B4; background: rgba(255, 105, 180, 0.1); box-shadow: 0 0 16px rgba(255, 105, 180, 0.25); }
.interact-sponsor:hover { color: var(--python-yellow); border-color: var(--python-yellow); background: rgba(255, 212, 59, 0.1); box-shadow: 0 0 16px rgba(255, 212, 59, 0.25); }
.interact-dislike:hover, .interact-dislike.interact-activated { color: #9CA3AF; border-color: #6B7280; background: rgba(107, 114, 128, 0.1); }

.interact-count { font-family: var(--font-code); font-size: 0.78rem; min-width: 1.2em; text-align: center; display: inline-block; }
.interact-count.count-pop { animation: countPop 0.4s ease; }
@keyframes countPop {
  0% { transform: scale(1); }
  40% { transform: scale(1.6); color: var(--ai-cyan); }
  100% { transform: scale(1); }
}

.interact-ripple {
  position: absolute; border-radius: 50%; pointer-events: none;
  width: 10px; height: 10px; top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0);
  opacity: 0.6;
  animation: rippleOut 0.6s ease-out forwards;
}
@keyframes rippleOut {
  0% { transform: translate(-50%, -50%) scale(0); opacity: 0.6; }
  100% { transform: translate(-50%, -50%) scale(8); opacity: 0; }
}

.flower-petal {
  position: absolute; top: -10px; font-size: 1.2rem; pointer-events: none;
  animation: petalFly 1.2s ease-out forwards;
  z-index: 10;
}
@keyframes petalFly {
  0% { opacity: 1; transform: translateY(0) translateX(0) scale(1) rotate(0deg); }
  50% { opacity: 0.8; transform: translateY(-30px) translateX(var(--tx, 0px)) scale(1.2) rotate(180deg); }
  100% { opacity: 0; transform: translateY(-60px) translateX(var(--tx, 0px)) scale(0.3) rotate(360deg); }
}

.like-particle {
  position: absolute; top: -8px; font-size: 1rem; pointer-events: none;
  animation: heartBurst 0.9s ease-out forwards;
  z-index: 10;
}
@keyframes heartBurst {
  0% { opacity: 1; transform: translateY(0) translateX(0) scale(0.5); }
  40% { opacity: 1; transform: translateY(-25px) translateX(var(--tx, 0px)) scale(1.3); }
  100% { opacity: 0; transform: translateY(-50px) translateX(var(--tx, 0px)) scale(0.4); }
}

/* ========== Comment Section ========== */
.comment-section { margin-top: 0.5rem; }
.comment-input-area { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.comment-input {
  flex: 1; padding: 0.55rem 0.8rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-glow); background: rgba(30, 58, 95, 0.3);
  color: var(--text-primary); font-family: var(--font-body); font-size: 0.85rem;
  outline: none; transition: border-color var(--transition-fast);
}
.comment-input:focus { border-color: var(--ai-cyan); }
.comment-input::placeholder { color: var(--text-dim); }
.comment-submit-btn { white-space: nowrap; }
.comment-empty { font-size: 0.82rem; color: var(--text-dim); padding: 0.5rem 0; text-align: center; }
.comment-list { max-height: 200px; overflow-y: auto; }
.comment-item { display: flex; gap: 0.6rem; padding: 0.7rem 0; border-bottom: 1px solid rgba(0, 217, 255, 0.08); }
.comment-item:last-child { border-bottom: none; }
.comment-avatar {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem; font-weight: 700; color: #fff;
}
.comment-body { flex: 1; min-width: 0; }
.comment-meta { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.25rem; }
.comment-name { font-size: 0.82rem; font-weight: 500; color: var(--ai-cyan); }
.comment-time { font-size: 0.72rem; color: var(--text-dim); }
.comment-text { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; word-break: break-word; }

/* ========== Video Interaction ========== */
.video-interaction-wrap { margin-top: 1.2rem; }
.video-interaction-wrap .interaction-bar { margin-bottom: 0.8rem; }

/* ========== Base Modal ========== */
.modal {
  display: none;
  position: fixed; inset: 0; z-index: 10000;
  justify-content: center; align-items: flex-start;
  padding-top: 8vh;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  overflow-y: auto;
}
.modal.active { display: flex; }
.modal-close {
  position: absolute; top: 0.8rem; right: 1rem;
  background: none; border: none; color: var(--text-muted);
  font-size: 1.5rem; cursor: pointer; transition: color 0.2s;
  line-height: 1; z-index: 1;
}
.modal-close:hover { color: var(--text-primary); }
.modal-overlay {
  position: absolute; inset: 0; z-index: 0;
}
.modal-box {
  position: relative; z-index: 1;
}

/* ========== Sponsor Modal ========== */
.sponsor-box {
  background: rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  width: 94%; max-width: 780px;
  padding: 0; position: relative; overflow: hidden;
  box-shadow: 0 12px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.04);
  animation: sponsorBoxIn 0.35s ease-out;
}
@keyframes sponsorBoxIn { 0%{opacity:0;transform:translateY(20px) scale(0.97)}100%{opacity:1;transform:translateY(0) scale(1)} }

/* 顶部标题横幅 */
.sponsor-header {
  text-align: center; padding: 1.4rem 1.8rem 1rem;
  background: linear-gradient(180deg, rgba(255,212,59,0.04) 0%, transparent 100%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sponsor-header-icon {
  width: 48px; height: 48px; margin: 0 auto 0.6rem;
  background: linear-gradient(135deg, rgba(139,90,43,0.6), rgba(101,67,33,0.8));
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,212,59,0.15);
  box-shadow: 0 2px 12px rgba(139,90,43,0.3);
}
.sponsor-header h3 {
  font-size: 1.2rem; color: #fff; margin: 0 0 0.3rem; font-weight: 700;
  letter-spacing: 1px;
}
.sponsor-header p {
  font-size: 0.8rem; color: rgba(255,255,255,0.45); margin: 0;
}

/* 主体双列 */
.sponsor-body-layout {
  display: flex; gap: 0; align-items: stretch;
}

/* 左列：金额选择 */
.sponsor-left {
  flex: 2; min-width: 0; padding: 1.2rem 1.4rem 1.4rem;
}
.sponsor-section-label {
  font-size: 0.72rem; color: rgba(255,255,255,0.35); margin-bottom: 0.6rem;
  text-transform: uppercase; letter-spacing: 1.5px; font-weight: 500;
}
.sponsor-amounts {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem;
}
.sponsor-amount-btn {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; padding: 0.7rem 0.2rem; border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.06); background: rgba(25, 35, 55, 0.8);
  color: rgba(255,255,255,0.55); cursor: pointer;
  transition: all 0.25s; position: relative; overflow: hidden;
  aspect-ratio: 1;
}
.sponsor-amount-btn .amt-icon { font-size: 1.15rem; line-height: 1; opacity: 0.6; }
.sponsor-amount-btn .amt-val { font-size: 0.85rem; font-weight: 700; color: rgba(255,255,255,0.85); }
.sponsor-amount-btn .amt-label { font-size: 0.58rem; color: rgba(255,255,255,0.3); letter-spacing: 0.3px; }
.sponsor-amount-btn:hover {
  border-color: rgba(255,255,255,0.18); color: rgba(255,255,255,0.8);
  background: rgba(35, 50, 75, 0.8);
  transform: translateY(-1px);
}
.sponsor-amount-btn.selected {
  border-color: rgba(255,255,255,0.7); color: #FFD43B;
  background: rgba(45, 55, 75, 0.9);
  box-shadow: 0 0 24px rgba(255,212,59,0.12), inset 0 0 20px rgba(255,212,59,0.05);
}
.sponsor-amount-btn.selected .amt-icon { opacity: 1; }
.sponsor-amount-btn.selected .amt-val { color: #FFD43B; }
.sponsor-amount-btn.selected .amt-label { color: rgba(255,212,59,0.7); }
.sponsor-amount-btn.selected::after {
  content: ''; position: absolute; top: 5px; right: 5px;
  width: 8px; height: 8px; border-radius: 50%;
  background: #FFD43B;
  box-shadow: 0 0 6px #FFD43B;
  animation: dotPulse 1.2s ease-in-out infinite;
}
@keyframes dotPulse { 0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.5);opacity:0.5} }

/* 自定义金额(在网格内) */
.sponsor-amount-btn.custom-amt {
  border-style: dashed; border-color: rgba(255,255,255,0.12);
}
.sponsor-amount-btn.custom-amt.selected {
  border-style: solid;
}
.sponsor-custom-wrap {
  display: none; margin-top: 0.5rem;
}
.sponsor-custom-wrap.visible {
  display: flex;
}
.sponsor-custom-input {
  display: flex; align-items: center; gap: 0.5rem; width: 100%;
}
.sponsor-custom-input input {
  flex: 1; padding: 0.5rem 0.7rem; border-radius: 8px;
  border: 1px solid rgba(0,217,255,0.15); background: rgba(20, 30, 48, 0.7);
  color: var(--text-primary); font-size: 0.85rem; outline: none;
  font-family: var(--font-code); transition: border-color 0.2s;
}
.sponsor-custom-input input:focus { border-color: var(--python-yellow); }
.sponsor-custom-input span { font-size: 0.82rem; color: var(--text-dim); }

/* 右列：支付区 */
.sponsor-right {
  width: 260px; flex-shrink: 0;
  padding: 1.2rem 1.2rem 1.4rem;
  border-left: 1px solid rgba(255,255,255,0.06);
  background: linear-gradient(180deg, rgba(22,119,255,0.03) 0%, rgba(0,82,217,0.02) 100%);
  display: flex; flex-direction: column; align-items: center;
  position: relative;
}
/* 二维码展示区 - 仅显示收款码图片 */
.sponsor-qr-area {
  width: 100%;
  display: flex;
  flex-direction: column; align-items: center; justify-content: center;
  padding: 0.5rem 0;
}
.sponsor-qr-area .sponsor-qr-img {
  width: 200px; height: 200px; object-fit: contain;
  border-radius: 10px;
  background: #fff; padding: 6px;
  box-shadow: 0 4px 24px rgba(0,217,255,0.15), 0 0 0 1px rgba(0,217,255,0.08);
}
.sponsor-qr-label { font-size: 0.85rem; margin: 6px 0; letter-spacing: 1px; }
.sponsor-qr-label-alipay { color: #1677FF; font-weight: 600; }
.sponsor-qr-label-wechat { color: #9CA3AF; font-size: 0.75rem; font-style: italic; }
.sponsor-qr-benefit {
  margin-top: 10px; padding: 10px 12px;
  font-size: 0.78rem; line-height: 1.7;
  color: #FFD43B;
  text-align: center;
  background: linear-gradient(135deg, rgba(255,212,59,0.08), rgba(0,217,255,0.06));
  border-radius: 8px;
  border: 1px solid rgba(255,212,59,0.15);
  animation: benefitGlow 3s ease-in-out infinite;
}
@keyframes benefitGlow {
  0%, 100% { text-shadow: 0 0 4px rgba(255,212,59,0.3); }
  50% { text-shadow: 0 0 12px rgba(255,212,59,0.6), 0 0 24px rgba(0,217,255,0.2); }
}
/* Terminal typing effect lines */
/* Move benefit box down */
.sponsor-qr-benefit {
  margin-top: 12px;
}

/* ===== 敲代码小人场景 ===== */
.coder-scene {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  margin: 4px 0 2px;
  height: 32px;
}
.coder-figure {
  position: relative;
  width: 18px;
  height: 28px;
}
/* 头 */
.coder-figure::before {
  content: '';
  position: absolute;
  top: 0; left: 2px;
  width: 14px; height: 14px;
  background: #FFD43B;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(255,212,59,0.4);
}
/* 身体 */
.coder-figure::after {
  content: '';
  position: absolute;
  top: 14px; left: 3px;
  width: 12px; height: 10px;
  background: #3776AB;
  border-radius: 3px 3px 0 0;
}
/* 手臂 - 敲键盘 */
.coder-arm {
  position: absolute;
  top: 15px; left: 14px;
  width: 10px; height: 3px;
  background: #E5E7EB;
  border-radius: 2px;
  transform-origin: left center;
  animation: armType 0.3s ease-in-out infinite alternate;
}
@keyframes armType {
  0% { transform: rotate(-8deg); }
  100% { transform: rotate(8deg); }
}
/* 电脑 */
.coder-laptop {
  position: relative;
  width: 22px; height: 16px;
  margin-bottom: 0;
}
/* 屏幕 */
.coder-laptop::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 22px; height: 12px;
  background: #0a1628;
  border: 1.5px solid #3776AB;
  border-radius: 2px 2px 0 0;
  box-shadow: 0 0 8px rgba(0,217,255,0.3);
}
/* 屏幕光标闪烁 */
.coder-laptop::after {
  content: '';
  position: absolute;
  top: 4px; left: 4px;
  width: 3px; height: 5px;
  background: #00D9FF;
  animation: cursorBlink 0.5s step-end infinite;
}
/* 底座/键盘 */
.coder-desk {
  width: 26px; height: 4px;
  background: #9CA3AF;
  border-radius: 0 0 2px 2px;
  margin-bottom: 0;
}
/* 代码粒子飞出 */
.coder-particles {
  position: absolute;
  top: -2px; right: -6px;
  width: 8px; height: 12px;
}
.coder-particles span {
  position: absolute;
  display: block;
  width: 2px; height: 2px;
  background: #00D9FF;
  border-radius: 50%;
  opacity: 0;
  animation: codeParticle 1.5s ease-out infinite;
}
.coder-particles span:nth-child(1) { left: 0; top: 0; animation-delay: 0s; }
.coder-particles span:nth-child(2) { left: 3px; top: 3px; animation-delay: 0.3s; }
.coder-particles span:nth-child(3) { left: 6px; top: 1px; animation-delay: 0.6s; }
@keyframes codeParticle {
  0% { opacity: 0; transform: translate(0,0) scale(1); }
  20% { opacity: 1; }
  100% { opacity: 0; transform: translate(6px,-8px) scale(0.5); }
}


/* Thanks Step */
.sponsor-thanks-overlay {
  position: absolute; inset: 0; z-index: 10;
  background: rgba(17,24,39,0.97); border-radius: 18px;
  display: none; flex-direction: column; align-items: center; justify-content: center;
  animation: thanksFadeIn 0.4s ease-out;
}
.sponsor-thanks-overlay.visible { display: flex; }
@keyframes thanksFadeIn { 0%{opacity:0;transform:scale(0.95)}100%{opacity:1;transform:scale(1)} }

.thanks-container { text-align: center; padding: 1.5rem 2rem; position: relative; overflow: hidden; }
.thanks-stars { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
.thanks-particle {
  position: absolute; bottom: -20px; animation: floatUp var(--dur, 2s) var(--delay, 0s) ease-out forwards;
  pointer-events: none; z-index: 0; opacity: 0.9;
}
@keyframes sponsorRippleOut {
  0% { transform: scale(0.3); opacity: 1; }
  100% { transform: scale(2.5); opacity: 0; }
}
@keyframes floatUp {
  0% { opacity: 0; transform: translateY(0) scale(0.5) rotate(0deg); }
  20% { opacity: 1; }
  100% { opacity: 0; transform: translateY(-280px) scale(1.2) rotate(360deg); }
}
.thanks-icon { font-size: 3.5rem; position: relative; z-index: 1; animation: thanksBounce 0.6s ease-out; }
@keyframes thanksBounce {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}
.thanks-title {
  font-size: 1.4rem; color: #fff; margin: 0.5rem 0; position: relative; z-index: 1;
  background: linear-gradient(90deg, #FFD43B, #FF8C00, #FFD43B);
  background-size: 200% auto; -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  animation: shimmerText 2s linear infinite;
}
@keyframes shimmerText { 0%{background-position:0% center}100%{background-position:200% center} }
.thanks-amount {
  font-size: 2rem; font-weight: 800; color: var(--python-yellow); position: relative; z-index: 1;
  text-shadow: 0 0 20px rgba(255,212,59,0.5); margin: 0.5rem 0;
  animation: amountReveal 0.8s ease-out;
}
@keyframes amountReveal { 0%{transform:scale(0);opacity:0}60%{transform:scale(1.2)}100%{transform:scale(1);opacity:1} }
.thanks-msg {
  font-size: 0.88rem; color: var(--text-secondary); position: relative; z-index: 1; margin: 0.5rem 0;
}
.thanks-from { font-size: 0.85rem; color: var(--ai-cyan); font-style: italic; position: relative; z-index: 1; margin-bottom: 1rem; }
.sponsor-close-final {
  position: relative; z-index: 1; padding: 0.6rem 2rem;
  background: linear-gradient(135deg, var(--python-yellow), #FFA500);
  color: #1a1a2e; font-weight: 700; font-size: 0.9rem;
  border: none; border-radius: 10px; cursor: pointer;
  transition: all 0.25s;
}
.sponsor-close-final:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(255,212,59,0.3); }

/* ========== Footer ========== */
.footer {
  position: relative; z-index: 1; text-align: center;
  padding: 2.5rem 2rem 1.5rem; border-top: 1px solid var(--border-glow);
  background: rgba(10, 14, 26, 0.95);
}
.footer-brand {
  display: flex; align-items: center; justify-content: center; gap: 0.6rem;
  margin-bottom: 1rem;
}
.footer-logo {
  font-family: var(--font-heading); font-size: 1rem; font-weight: 700;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-separator { color: var(--border-glow); font-size: 0.8rem; }
.footer-author {
  font-family: var(--font-code); font-size: 0.85rem;
  color: var(--python-yellow); letter-spacing: 0.5px;
}
.footer-links { display: flex; gap: 1.5rem; justify-content: center; margin-bottom: 1.2rem; }
.footer-link { font-size: 0.85rem; color: var(--text-secondary); transition: color var(--transition-fast); }
.footer-link:hover { color: var(--ai-cyan); }
.footer-divider {
  width: 60px; height: 1px; margin: 0 auto 1rem;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), transparent);
}
.footer-bottom { display: flex; flex-direction: column; gap: 0.4rem; align-items: center; }
.footer-copyright { font-size: 0.75rem; color: var(--text-dim); }
.footer-filing { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }
.filing-link {
  font-size: 0.72rem; color: var(--text-dim); text-decoration: none;
  transition: color var(--transition-fast); letter-spacing: 0.3px;
}
.filing-link:hover { color: var(--ai-cyan); }
.filing-police { display: inline-flex; align-items: center; gap: 0.25rem; }
.filing-icon { opacity: 0.6; flex-shrink: 0; }
.filing-dot {
  display: inline-block; width: 3px; height: 3px; border-radius: 50%;
  background: var(--text-dim); opacity: 0.5;
}

/* ========== Animations ========== */
@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes logoPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 217, 255, 0.3); }
  50% { box-shadow: 0 0 40px rgba(0, 217, 255, 0.6), 0 0 60px rgba(0, 217, 255, 0.2); }
}
@keyframes borderPulse {
  0%, 100% { border-color: rgba(0, 217, 255, 0.3); }
  50% { border-color: rgba(0, 217, 255, 0.7); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }

/* ========== Toast ========== */
.toast-container {
  position: fixed; top: 80px; right: 20px; z-index: 9999;
  display: flex; flex-direction: column; gap: 0.6rem;
}
.toast {
  padding: 0.8rem 1.2rem; border-radius: var(--radius-md);
  font-size: 0.88rem; color: var(--text-primary);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow); animation: toastSlide 0.3s ease;
  max-width: 360px; display: flex; align-items: center; gap: 0.6rem;
}
.toast.success { background: rgba(16, 185, 129, 0.15); border-color: rgba(16, 185, 129, 0.3); }
.toast.error { background: rgba(239, 68, 68, 0.15); border-color: rgba(239, 68, 68, 0.3); }
.toast.info { background: rgba(0, 217, 255, 0.1); border-color: rgba(0, 217, 255, 0.2); }
@keyframes toastSlide {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ========== Modal ========== */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 10000;
  background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 2rem;
  opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-content {
  background: var(--bg-card-solid); border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg); padding: 2rem; max-width: 500px; width: 100%;
  transform: translateY(20px); transition: transform 0.3s;
}
.modal-overlay.active .modal-content { transform: translateY(0); }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.modal-title { font-family: var(--font-heading); font-size: 1.1rem; font-weight: 600; color: var(--text-primary); }
.modal-close {
  background: none; border: none; color: var(--text-secondary);
  font-size: 1.4rem; cursor: pointer; padding: 4px;
  transition: color var(--transition-fast); line-height: 1;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.7; }
.modal-link-list { display: flex; flex-direction: column; gap: 0.8rem; margin-top: 1rem; }
.modal-link-item {
  display: flex; align-items: center; gap: 0.8rem;
  padding: 0.8rem 1rem; background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06); border-radius: var(--radius-md);
  text-decoration: none; color: var(--text-primary); transition: all var(--transition-fast);
}
.modal-link-item:hover { background: rgba(0, 217, 255, 0.05); border-color: rgba(0, 217, 255, 0.2); }
.modal-link-item .link-icon { font-size: 1.2rem; }
.modal-link-item .link-name { flex: 1; font-weight: 500; }
.modal-link-item .link-arrow { color: var(--text-dim); }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .navbar { padding: 0 1rem; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(10, 14, 26, 0.95); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    flex-direction: column; padding: 1rem 0; border-bottom: 1px solid var(--border-glow);
  }
  .nav-links.open { display: flex; }
  .nav-mobile-btn { display: flex; }
  .hero { padding: 5rem 1.5rem 3rem; }
  .hero-logo { max-width: 240px; }
  .hero-id-fx { gap: 8px; padding: 0.4rem 0.8rem; }
  .hero-id-name { font-size: 1rem; }
  .hero-id-tag { font-size: 0.85rem; }
  .section { padding: 3rem 1.5rem; }
  .download-grid, .articles-grid, .video-featured-grid { grid-template-columns: 1fr; }
  .about-card { flex-direction: column; align-items: center; text-align: center; }
  .about-avatar { width: 180px; min-height: 90px; }
  .about-skills { justify-content: center; }
  .video-playlist { grid-template-columns: 1fr; }
  .video-controls-bar { flex-direction: column; align-items: stretch; }
  .video-url-input { min-width: 0; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .download-grid, .video-featured-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.5rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .download-card-actions .btn { font-size: 0.78rem; padding: 0.45rem 0.6rem; }
}

/* ============================================
   ADMIN PANEL STYLES
   ============================================ */
.admin-body {
  background: var(--bg-primary);
  overflow-x: hidden;
}

.admin-layout {
  display: flex; min-height: 100vh; position: relative; z-index: 1;
}

.admin-sidebar {
  width: 240px; background: rgba(17, 24, 39, 0.95);
  border-right: 1px solid var(--border-glow);
  padding: 1.5rem 0; position: fixed; top: 0; left: 0;
  height: 100vh; overflow-y: auto; z-index: 100;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.admin-sidebar-logo {
  padding: 0 1.5rem 1.5rem; border-bottom: 1px solid var(--border-glow); margin-bottom: 1rem;
}
.admin-sidebar-title {
  font-family: var(--font-heading); font-size: 0.9rem; font-weight: 700;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.admin-sidebar-sub {
  font-family: var(--font-code); font-size: 0.7rem; color: var(--text-dim); margin-top: 2px;
}
.admin-nav { list-style: none; }
.admin-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 0.7rem 1.5rem; font-size: 0.88rem;
  color: var(--text-secondary); cursor: pointer;
  transition: all var(--transition-fast); border-left: 3px solid transparent;
}
.admin-nav-item:hover { color: var(--text-primary); background: rgba(0, 217, 255, 0.04); }
.admin-nav-item.active {
  color: var(--ai-cyan); background: rgba(0, 217, 255, 0.06);
  border-left-color: var(--ai-cyan);
}
.admin-nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.admin-main {
  flex: 1; margin-left: 240px; padding: 2rem;
  min-height: 100vh;
}
.admin-topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 2rem;
}
.admin-topbar h1 {
  font-family: var(--font-heading); font-size: 1.3rem;
  font-weight: 700; color: var(--text-primary);
}
.admin-topbar-actions { display: flex; gap: 0.8rem; align-items: center; }

.admin-panel { display: none; }
.admin-panel.active { display: block; }

/* Admin Form Elements */
.admin-form-group { margin-bottom: 1.5rem; }
.admin-form-label {
  display: block; font-size: 0.85rem; font-weight: 500;
  color: var(--text-secondary); margin-bottom: 0.4rem;
}
.admin-form-input,
.admin-form-textarea,
.admin-form-select {
  width: 100%; padding: 0.65rem 1rem;
  font-size: 0.88rem; font-family: var(--font-body);
  background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm); color: var(--text-primary);
  outline: none; transition: border-color var(--transition-fast);
}
.admin-form-input:focus, .admin-form-textarea:focus, .admin-form-select:focus {
  border-color: var(--ai-cyan);
}
.admin-form-textarea { min-height: 120px; resize: vertical; line-height: 1.7; }
.admin-form-select { cursor: pointer; }
.admin-form-select option { background: var(--bg-card-solid); color: var(--text-primary); }
.admin-form-row { display: flex; gap: 1rem; }
.admin-form-row .admin-form-group { flex: 1; }

.admin-form-hint {
  font-size: 0.78rem; color: var(--text-dim); margin-top: 0.3rem;
}

/* Admin Table */
.admin-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-card); border-radius: var(--radius-md);
  overflow: hidden; border: 1px solid var(--border-glow);
}
.admin-table th {
  text-align: left; padding: 0.8rem 1rem; font-size: 0.8rem;
  font-weight: 600; color: var(--text-dim); text-transform: uppercase;
  letter-spacing: 0.5px; background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-glow);
}
.admin-table td {
  padding: 0.8rem 1rem; font-size: 0.88rem;
  color: var(--text-secondary); border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: rgba(0, 217, 255, 0.02); }
.admin-table-actions { display: flex; gap: 0.5rem; }

.admin-empty {
  text-align: center; padding: 3rem 1rem;
  color: var(--text-dim); font-size: 0.95rem;
}
.admin-empty-icon { font-size: 2.5rem; margin-bottom: 0.8rem; opacity: 0.3; }

/* Admin Tags Input */
.admin-tags-input {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  padding: 0.5rem; background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-sm);
  min-height: 42px; cursor: text;
}
.admin-tags-input:focus-within { border-color: var(--ai-cyan); }
.admin-tag-item {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 0.15rem 0.5rem; font-size: 0.78rem;
  background: rgba(0, 217, 255, 0.1); color: var(--ai-cyan);
  border-radius: 4px; border: 1px solid rgba(0, 217, 255, 0.2);
}
.admin-tag-remove {
  cursor: pointer; font-size: 0.9rem; line-height: 1;
  opacity: 0.6; transition: opacity var(--transition-fast);
}
.admin-tag-remove:hover { opacity: 1; }
.admin-tags-field {
  border: none; background: none; outline: none;
  color: var(--text-primary); font-size: 0.85rem; flex: 1;
  min-width: 80px; padding: 0.15rem;
}
.admin-tags-field::placeholder { color: var(--text-dim); }

/* Admin Cloud Links Editor */
.admin-cloud-links { display: flex; flex-direction: column; gap: 0.6rem; }
.admin-cloud-link-row {
  display: flex; gap: 0.5rem; align-items: center;
}
.admin-cloud-link-row input { flex: 1; }

/* Admin Danger Button */
.btn-danger {
  background: rgba(239, 68, 68, 0.15); color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25); border-color: rgba(239, 68, 68, 0.4);
}

/* Toast */
.toast-container {
  position: fixed; top: 1.5rem; right: 1.5rem; z-index: 9999;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.toast {
  padding: 0.7rem 1.2rem; border-radius: var(--radius-sm);
  font-size: 0.85rem; color: var(--text-primary);
  background: rgba(17, 24, 39, 0.95); border: 1px solid var(--border-glow);
  backdrop-filter: blur(12px); display: flex; align-items: center; gap: 0.5rem;
  animation: toastIn 0.3s ease; min-width: 200px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.toast.success { border-color: rgba(16,185,129,0.3); }
.toast.success span:first-child { color: #10b981; }
.toast.error { border-color: rgba(239,68,68,0.3); }
.toast.error span:first-child { color: #ef4444; }
.toast.info { border-color: rgba(0,217,255,0.3); }
.toast.info span:first-child { color: var(--ai-cyan); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 768px) {
  .admin-sidebar { width: 60px; padding: 1rem 0; }
  .admin-sidebar-logo { padding: 0 0.5rem 1rem; }
  .admin-sidebar-title, .admin-sidebar-sub { display: none; }
  .admin-nav-item { padding: 0.7rem; justify-content: center; }
  .admin-nav-item span { display: none; }
  .admin-main { margin-left: 60px; padding: 1rem; }
  .admin-form-row { flex-direction: column; gap: 0; }
  .sponsor-amounts { grid-template-columns: repeat(3, 1fr); gap: 0.4rem; }
  .sponsor-body-layout { flex-direction: column; }
  .sponsor-right { width: 100%; border-left: none; border-top: 1px solid rgba(255,255,255,0.06); padding-top: 1rem; }
  .sponsor-box { border-radius: 14px; }
  .sponsor-amount-btn { padding: 0.55rem 0.2rem; }
  .sponsor-amount-btn .amt-val { font-size: 0.75rem; }
  .sponsor-amount-btn .amt-label { font-size: 0.52rem; }
  .interaction-bar { gap: 0.4rem; }
  .interact-btn { padding: 0.35rem 0.6rem; font-size: 0.78rem; }
  .comment-input-area { flex-direction: column; }
  .sub-page-header h1 { font-size: 1.8rem; }
  .filter-group { flex-wrap: wrap; }
  .sub-grid.articles-grid { grid-template-columns: 1fr; }
  .sub-grid.downloads-grid { grid-template-columns: repeat(2, 1fr); }
  .sub-grid.videos-grid { grid-template-columns: 1fr; }
}

/* ========== 子页面通用 ========== */
.sub-page { min-height: 100vh; background: var(--bg-primary); color: var(--text-primary); }

.sub-page-header {
  position: relative; padding: 5rem 2rem 3rem; text-align: center;
  background: linear-gradient(180deg, rgba(55,118,171,0.12) 0%, transparent 100%);
  border-bottom: 1px solid rgba(0,217,255,0.12);
  overflow: hidden;
}
.sub-page-header::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 60%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), transparent);
  animation: headerScanLine 3s ease-in-out infinite;
}
@keyframes headerScanLine {
  0%, 100% { opacity: 0.3; width: 40%; }
  50% { opacity: 1; width: 80%; }
}
.sub-page-header::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 60%;
  background: radial-gradient(ellipse at center bottom, rgba(0,217,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.sub-page-header h1 {
  position: relative; font-family: 'Orbitron', sans-serif; font-size: 2.4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--python-blue), var(--ai-cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 0.6rem; letter-spacing: 0.08em;
}
.sub-page-header h1::after {
  content: ''; display: block; width: 60px; height: 3px; margin: 0.8rem auto 0;
  background: linear-gradient(90deg, var(--python-blue), var(--ai-cyan));
  border-radius: 2px;
  box-shadow: 0 0 12px rgba(0,217,255,0.4);
}
.sub-page-header p {
  position: relative; color: var(--text-secondary); font-size: 1rem;
  max-width: 500px; margin: 0 auto; line-height: 1.6;
}
.sub-page-breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  margin-top: 1rem; font-size: 0.85rem; color: var(--text-muted);
}
.sub-page-breadcrumb a { color: var(--ai-cyan); text-decoration: none; transition: opacity 0.2s; }
.sub-page-breadcrumb a:hover { opacity: 0.8; }


/* ========== 子页面内容区 ========== */
.sub-page-content { max-width: 960px; margin: 0 auto; padding: 2rem 1.5rem; }

/* ========== Articles Page — 列表居中 + 科技风排版 ========== */

/* 文章网格 — 居中单列列表 */
.articles-grid.articles-grid-full {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
  max-width: 960px; margin: 0 auto;
}

/* 文章卡片 — 竖向科技卡片 */
.article-card.article-card-full {
  display: flex; flex-direction: column;
  background: rgba(17, 24, 39, 0.6); backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 217, 255, 0.06); border-radius: 14px;
  overflow: hidden; cursor: pointer; position: relative;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.article-card.article-card-full:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 217, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 217, 255, 0.1), 0 0 0 1px rgba(0, 217, 255, 0.05);
}

/* 顶部装饰条 */
.article-card-full::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), var(--python-blue), var(--python-yellow), var(--ai-cyan), transparent);
  background-size: 200% 100%; opacity: 0;
  transition: opacity 0.3s; animation: techBarSlide 3s linear infinite;
}
.article-card.article-card-full:hover::before { opacity: 1; }

/* 序号 + 标签区 */
.article-card-top {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.9rem 1.2rem 0;
  position: relative;
}
.article-card-top .article-index {
  font-family: 'Orbitron', sans-serif; font-size: 0.7rem; font-weight: 700;
  color: var(--ai-cyan); opacity: 0.6; letter-spacing: 0.05em;
}
.article-card-top .article-card-tags {
  display: flex; gap: 0.35rem; margin-left: auto;
}
.article-card-top .article-card-tags .tag {
  font-size: 0.6rem; padding: 0.15rem 0.5rem; white-space: nowrap;
  border-radius: 4px;
}

/* 正文内容 */
.article-card-full .article-card-body {
  flex: 1; padding: 0.5rem 1.2rem 1rem; display: flex; flex-direction: column;
}
.article-card-full .article-card-title {
  font-size: 1rem; font-weight: 600; color: var(--text-primary);
  margin-bottom: 0.5rem; line-height: 1.5;
  transition: color 0.3s;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card.article-card-full:hover .article-card-title { color: var(--ai-cyan); }
.article-card-full .article-card-excerpt {
  font-size: 0.82rem; color: var(--text-secondary); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 0;
}
.article-card-read-more {
  font-family: var(--font-code); font-size: 0.75rem; color: var(--ai-cyan);
  margin-top: auto; padding-top: 0.6rem;
  opacity: 0; transform: translateY(4px);
  transition: all 0.3s; display: flex; align-items: center; gap: 0.3rem;
}
.article-card.article-card-full:hover .article-card-read-more {
  opacity: 1; transform: translateY(0);
}
.article-card-read-more svg { width: 14px; height: 14px; }

/* 卡片底部日期 */
.article-card-full .article-card-date {
  font-family: var(--font-code); font-size: 0.7rem; color: var(--text-dim);
  padding: 0.6rem 1.2rem; border-top: 1px solid rgba(0,217,255,0.05);
  display: flex; align-items: center; gap: 0.4rem;
}
.article-card-full .article-card-date::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--python-blue); opacity: 0.6;
}

/* 扫描线装饰 */
.article-card-full::after {
  content: ''; position: absolute; left: 0; top: 0; right: 0; bottom: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0,217,255,0.03) 100%);
  pointer-events: none; opacity: 0; transition: opacity 0.3s;
}
.article-card.article-card-full:hover::after { opacity: 1; }

/* ========== Article Detail — 居中阅读排版 ========== */
.article-detail-page {
  max-width: 800px; margin: 0 auto; padding: 1rem 1.5rem 3rem;
  animation: fadeInUp 0.4s ease-out;
}
.back-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.2rem; margin-bottom: 1.5rem;
  background: rgba(17, 24, 39, 0.6); backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 217, 255, 0.15); border-radius: 8px;
  color: var(--text-secondary); font-size: 0.88rem; cursor: pointer;
  transition: all 0.3s; font-family: var(--font-body);
}
.back-btn:hover {
  color: var(--ai-cyan); border-color: var(--ai-cyan);
  box-shadow: 0 0 12px rgba(0, 217, 255, 0.15); transform: translateX(-3px);
}
.back-btn svg { transition: transform 0.3s; }
.back-btn:hover svg { transform: translateX(-3px); }

.article-detail {
  background: rgba(17, 24, 39, 0.5); backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 217, 255, 0.08); border-radius: 16px;
  padding: 2.5rem 2.5rem 2rem; position: relative; overflow: hidden;
}
/* 顶部渐变装饰线 */
.article-detail::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, #3776AB, #00D9FF, #FFD43B, #00D9FF, #3776AB);
  background-size: 200% 100%; animation: gradientSlide 4s linear infinite;
}
@keyframes gradientSlide {
  0% { background-position: 0% 50%; } 100% { background-position: 200% 50%; }
}
/* 扫描线纹理 */
.article-detail::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 3px, rgba(0, 217, 255, 0.012) 3px, rgba(0, 217, 255, 0.012) 4px
  );
}

.detail-title {
  font-size: 1.6rem; font-weight: 700; color: var(--text-primary);
  line-height: 1.4; margin-bottom: 1.2rem; position: relative; z-index: 1;
}
.detail-meta {
  display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem;
  padding-bottom: 1rem; border-bottom: 1px solid rgba(0, 217, 255, 0.08);
  flex-wrap: wrap; position: relative; z-index: 1;
}
.detail-date {
  font-family: var(--font-code); font-size: 0.82rem; color: var(--text-dim);
  display: flex; align-items: center; gap: 0.4rem;
}
.detail-date::before {
  content: ''; display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ai-cyan); box-shadow: 0 0 6px var(--ai-cyan);
}
.detail-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.detail-content {
  font-size: 0.95rem; color: var(--text-secondary); line-height: 1.9;
  margin-bottom: 2rem; min-height: 120px; position: relative; z-index: 1;
}
.detail-content br + br { display: block; margin-top: 0.8rem; }
.detail-interactions {
  border-top: 1px solid rgba(0, 217, 255, 0.08); padding-top: 1.5rem;
  margin-top: 0.5rem; position: relative; z-index: 1;
}


/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .articles-grid.articles-grid-full { grid-template-columns: 1fr; }
  .article-card-top { padding: 0.7rem 1rem 0; }
  .article-card-top .article-card-tags { flex-direction: row; margin-top: 0; }
  .article-detail { padding: 1.5rem 1.2rem 1.2rem; }
  .detail-title { font-size: 1.3rem; }
  .articles-grid.articles-grid-full { max-width: 100%; }
}

/* ========== Video Page Layout ========== */
.video-page-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}
.video-player-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  position: relative;
}
.video-player-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), var(--python-blue), var(--python-yellow), var(--ai-cyan), transparent);
  background-size: 200% 100%;
  animation: techBarSlide 4s linear infinite;
  z-index: 2;
}
.video-player-wrapper {
  position: relative;
  background: #000;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
}
.video-player-card video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
/* Video placeholder when no video */
.video-player-wrapper .video-empty-state {
  aspect-ratio: 16 / 9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, rgba(0,217,255,0.03) 0%, transparent 70%);
  color: var(--text-dim);
  gap: 0.8rem;
}
.video-player-wrapper .video-empty-state svg {
  width: 64px; height: 64px;
  opacity: 0.3;
  animation: floatIcon 3s ease-in-out infinite;
}
@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.video-player-wrapper .video-empty-state span {
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.video-url-input-area {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 1rem 1.2rem;
  background: rgba(10, 14, 26, 0.6);
  border-top: 1px solid var(--border-glow);
}
.video-url-input-area .form-input {
  flex: 1; min-width: 0;
  padding: 0.6rem 1rem; font-size: 0.85rem;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font-code); outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.video-url-input-area .form-input::placeholder { color: var(--text-dim); }
.video-url-input-area .form-input:focus {
  border-color: var(--ai-cyan);
  box-shadow: 0 0 0 2px rgba(0, 217, 255, 0.15);
}

/* ---- Playlist Panel (horizontal below player) ---- */
.video-list-wrapper {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
/* Top tech bar */
.video-list-wrapper::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--ai-cyan), var(--python-blue), var(--python-yellow), var(--ai-cyan), transparent);
  background-size: 200% 100%;
  animation: techBarSlide 4s linear infinite;
  z-index: 2;
}
/* Scan line overlay */
.video-list-wrapper::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent, transparent 3px,
    rgba(0, 217, 255, 0.015) 3px, rgba(0, 217, 255, 0.015) 4px
  );
  pointer-events: none; z-index: 1;
}

.video-list-title {
  margin: 0; padding: 1rem 1.2rem 0.8rem;
  font-family: var(--font-display); font-size: 0.95rem;
  color: var(--ai-cyan); letter-spacing: 0.12em;
  text-transform: uppercase; position: relative; z-index: 2;
  display: flex; align-items: center; gap: 0.6rem;
  border-bottom: 1px solid rgba(0, 217, 255, 0.1);
  flex-shrink: 0;
}
.video-list-title::before {
  content: '';
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ai-cyan);
  box-shadow: 0 0 8px var(--ai-cyan), 0 0 16px rgba(0, 217, 255, 0.3);
  animation: playlistDot 2s ease-in-out infinite;
}
@keyframes playlistDot {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--ai-cyan), 0 0 16px rgba(0, 217, 255, 0.3); }
  50% { opacity: 0.5; box-shadow: 0 0 4px var(--ai-cyan); }
}


/* ===== AI 智能体页面 - 豆包风格 + 科技元素 ===== */
.ai-page{background:#0a0e1a;overflow:hidden}
.ai-page .navbar{position:fixed;top:0;left:0;right:0;z-index:100}

/* ── 豆包式主布局 ── */
.ai-doubao-layout{display:flex;height:100vh;padding-top:56px;background:#0a0e1a}

/* ── 左侧边栏 ── */
.ai-db-sidebar{
  width:260px;min-width:260px;
  background:rgba(14,20,33,0.95);
  border-right:1px solid rgba(55,118,171,0.12);
  display:flex;flex-direction:column;
  transition:margin-left 0.3s ease,opacity 0.3s ease;
  overflow-y:auto;overflow-x:hidden;
  position:relative;
}
.ai-db-sidebar::after{
  content:'';position:absolute;top:0;right:0;bottom:0;width:1px;
  background:linear-gradient(180deg,transparent,rgba(0,217,255,0.15),rgba(55,118,171,0.1),transparent);
  pointer-events:none;
}
.ai-db-sidebar.collapsed{margin-left:-260px;opacity:0;pointer-events:none}

/* 品牌 */
.ai-db-brand{
  display:flex;align-items:center;gap:0.7rem;
  padding:1rem 1rem 0.8rem;
  border-bottom:1px solid rgba(55,118,171,0.1);
}
.ai-db-brand-icon{
  width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,rgba(55,118,171,0.3),rgba(0,217,255,0.15));
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
}
.ai-db-brand-icon img{border-radius:50%;object-fit:cover}
.ai-db-brand-icon::before{
  content:'';position:absolute;inset:-2px;border-radius:12px;
  border:1px solid transparent;border-top-color:rgba(0,217,255,0.4);border-right-color:rgba(55,118,171,0.3);
  animation:dbIconSpin 4s linear infinite;
}
@keyframes dbIconSpin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}
.ai-db-brand-info{display:flex;flex-direction:column;gap:2px}
.ai-db-brand-name{font-family:'Orbitron',sans-serif;font-size:0.95rem;font-weight:700;color:#E5E7EB}
.ai-db-brand-status{display:flex;align-items:center;gap:4px;font-size:0.68rem;color:#9CA3AF}
.ai-db-status-dot{width:6px;height:6px;border-radius:50%;background:#10B981;box-shadow:0 0 6px #10B981;animation:dbDotPulse 2s ease-in-out infinite}
@keyframes dbDotPulse{0%,100%{opacity:1}50%{opacity:0.4}}

/* 新对话按钮 */
.ai-db-new-chat{
  display:flex;align-items:center;gap:0.5rem;
  margin:0.8rem 0.8rem 0;padding:0.55rem 0.8rem;
  border-radius:10px;border:1px dashed rgba(0,217,255,0.2);
  background:transparent;color:rgba(0,217,255,0.7);
  font-size:0.82rem;cursor:pointer;transition:all 0.3s;
}
.ai-db-new-chat:hover{border-color:rgba(0,217,255,0.5);color:#00D9FF;background:rgba(0,217,255,0.05)}

/* 功能列表 */
.ai-db-func-list{padding:0.6rem 0.5rem;flex:1}
.ai-db-func-group-title{
  font-size:0.62rem;text-transform:uppercase;color:#6B7280;
  letter-spacing:1.5px;padding:0.4rem 0.6rem;margin-bottom:0.3rem;
}
.ai-db-func-item{
  display:flex;align-items:center;gap:0.6rem;
  width:100%;padding:0.55rem 0.7rem;border-radius:8px;
  border:none;background:transparent;color:#9CA3AF;
  cursor:pointer;font-size:0.82rem;transition:all 0.2s;
  margin-bottom:2px;text-align:left;
}
.ai-db-func-item:hover{background:rgba(55,118,171,0.1);color:#E5E7EB}
.ai-db-func-item.active{
  background:linear-gradient(135deg,rgba(55,118,171,0.2),rgba(0,217,255,0.08));
  color:#00D9FF;
  box-shadow:inset 0 0 0 1px rgba(0,217,255,0.15);
}
.ai-db-func-item.active svg{stroke:#00D9FF}
.ai-db-func-item svg{width:18px;height:18px;flex-shrink:0;stroke:currentColor;opacity:0.7}
.ai-db-func-item.active svg{opacity:1}
.ai-db-func-item span:first-of-type{flex:1}
.ai-db-func-price{
  font-size:0.68rem;padding:1px 6px;border-radius:10px;
  background:rgba(255,212,59,0.1);color:rgba(255,212,59,0.7);
  border:1px solid rgba(255,212,59,0.15);
}
.ai-db-func-item.active .ai-db-func-price{color:#FFD43B;border-color:rgba(255,212,59,0.3)}

/* 用量 */
.ai-db-usage-section{padding:0.6rem 1rem;border-top:1px solid rgba(55,118,171,0.1)}
.ai-db-usage-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:0.4rem}
.ai-db-usage-header span{font-size:0.7rem;color:#6B7280}
.ai-db-usage-count{font-size:0.7rem;color:#00D9FF;font-weight:600;font-family:'Fira Code',monospace}
.ai-db-usage-bar{height:3px;border-radius:2px;background:rgba(255,255,255,0.06);overflow:hidden}
.ai-db-usage-fill{height:100%;border-radius:2px;background:linear-gradient(90deg,#3776AB,#00D9FF);transition:width 0.5s}

/* 已购 */
.ai-db-paid-section{padding:0.4rem 1rem}
.ai-db-paid-title{font-size:0.62rem;text-transform:uppercase;color:#6B7280;letter-spacing:1px;margin-bottom:0.3rem}
.ai-db-paid-list{display:flex;flex-wrap:wrap;gap:4px}
.ai-db-paid-tag{
  font-size:0.62rem;padding:2px 6px;border-radius:4px;
  background:rgba(16,185,129,0.1);color:#10B981;border:1px solid rgba(16,185,129,0.2);
}

/* 侧边栏底部 */
.ai-db-sidebar-footer{
  padding:0.8rem 1rem;border-top:1px solid rgba(55,118,171,0.1);
  font-size:0.62rem;color:#4B5563;text-align:center;
}

/* ── 右侧主区域 ── */
.ai-db-main{flex:1;display:flex;flex-direction:column;min-width:0;position:relative}

/* 扫描线装饰 */
.ai-db-main::before{
  content:'';position:fixed;top:0;right:0;bottom:0;left:260px;
  background:repeating-linear-gradient(0deg,transparent,transparent 3px,rgba(0,217,255,0.008) 3px,rgba(0,217,255,0.008) 4px);
  pointer-events:none;z-index:0;
}

/* 顶栏 */
.ai-db-topbar{
  display:flex;align-items:center;gap:0.6rem;
  padding:0.5rem 1.2rem;
  background:rgba(14,20,33,0.7);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(55,118,171,0.1);
  position:relative;z-index:1;
}
.ai-db-sidebar-toggle{
  width:32px;height:32px;border-radius:8px;
  border:1px solid rgba(55,118,171,0.15);
  background:rgba(17,24,39,0.5);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  color:#9CA3AF;transition:all 0.2s;
}
.ai-db-sidebar-toggle:hover{border-color:rgba(0,217,255,0.3);color:#00D9FF}
.ai-db-topbar-title{font-weight:600;color:#E5E7EB;font-size:0.9rem}
.ai-db-topbar-spacer{flex:1}
.ai-db-topbar-clear{
  display:flex;align-items:center;gap:4px;
  padding:4px 10px;border-radius:6px;
  border:1px solid rgba(255,255,255,0.06);
  background:transparent;color:#9CA3AF;
  font-size:0.75rem;cursor:pointer;transition:all 0.2s;
}
.ai-db-topbar-clear:hover{border-color:rgba(239,68,68,0.3);color:#EF4444;background:rgba(239,68,68,0.05)}

/* ── 消息区 ── */
.ai-db-messages{
  flex:1;overflow-y:auto;padding:1.5rem;
  display:flex;flex-direction:column;gap:1rem;
  scroll-behavior:smooth;position:relative;z-index:1;
}
.ai-db-messages::-webkit-scrollbar{width:4px}
.ai-db-messages::-webkit-scrollbar-track{background:transparent}
.ai-db-messages::-webkit-scrollbar-thumb{background:rgba(0,217,255,0.12);border-radius:2px}

/* ── 欢迎页 ── */
.ai-db-welcome{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  flex:1;padding:2rem;text-align:center;
  animation:dbWelcomeIn 0.5s ease;
  position:relative;
}
@keyframes dbWelcomeIn{0%{opacity:0;transform:translateY(20px)}100%{opacity:1;transform:translateY(0)}}
.ai-db-welcome-glow{
  position:absolute;top:30%;left:50%;transform:translate(-50%,-50%);
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(0,217,255,0.06) 0%,rgba(55,118,171,0.03) 40%,transparent 70%);
  pointer-events:none;animation:dbGlowPulse 4s ease-in-out infinite alternate;
}
@keyframes dbGlowPulse{0%{opacity:0.5;transform:translate(-50%,-50%) scale(0.95)}100%{opacity:0.8;transform:translate(-50%,-50%) scale(1.05)}}
.ai-db-welcome-avatar{
  width:72px;height:72px;border-radius:50%;
  background:linear-gradient(135deg,rgba(55,118,171,0.25),rgba(0,217,255,0.12));
  display:flex;align-items:center;justify-content:center;
  margin-bottom:1.5rem;position:relative;
  border:1px solid rgba(0,217,255,0.15);
  box-shadow:0 0 30px rgba(0,217,255,0.1);
}
.ai-db-welcome-avatar::before{
  content:'';position:absolute;inset:-5px;border-radius:50%;
  border:1px solid transparent;border-top-color:rgba(0,217,255,0.3);border-right-color:rgba(55,118,171,0.2);
  animation:dbIconSpin 3s linear infinite;
}
.ai-db-welcome-title{
  font-family:'Orbitron',sans-serif;font-size:1.4rem;font-weight:700;
  background:linear-gradient(90deg,#3776AB,#00D9FF,#FFD43B);
  background-size:200% auto;-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;animation:nameShimmer 4s linear infinite;
  margin-bottom:0.5rem;position:relative;z-index:1;
}
.ai-db-welcome-desc{font-size:0.88rem;color:#6B7280;max-width:400px;line-height:1.6;margin-bottom:2rem;position:relative;z-index:1}

/* 快捷卡片网格（豆包风格2x2） */
.ai-db-quick-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:10px;
  max-width:480px;width:100%;position:relative;z-index:1;
}
.ai-db-quick-card{
  display:flex;align-items:flex-start;gap:0.7rem;
  padding:0.9rem;border-radius:12px;
  background:rgba(17,24,39,0.5);
  border:1px solid rgba(55,118,171,0.1);
  cursor:pointer;transition:all 0.3s;text-align:left;
}
.ai-db-quick-card:hover{
  border-color:rgba(0,217,255,0.25);background:rgba(0,217,255,0.04);
  transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,0.2);
}
.ai-db-quick-card-icon{
  width:36px;height:36px;border-radius:10px;flex-shrink:0;
  background:rgba(17,24,39,0.6);border:1px solid rgba(55,118,171,0.15);
  display:flex;align-items:center;justify-content:center;
}
.ai-db-quick-card-text{display:flex;flex-direction:column;gap:2px}
.ai-db-quick-card-text strong{font-size:0.82rem;color:#E5E7EB;font-weight:600}
.ai-db-quick-card-text span{font-size:0.72rem;color:#6B7280;line-height:1.4}

/* ── 消息气泡（豆包风格） ── */
.ai-db-msg{display:flex;gap:0.6rem;max-width:75%;animation:dbMsgIn 0.3s ease}
.ai-db-msg-user{align-self:flex-end;flex-direction:row-reverse}
@keyframes dbMsgIn{0%{opacity:0;transform:translateY(8px)}100%{opacity:1;transform:translateY(0)}}

.ai-db-msg-avatar{
  width:34px;height:34px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  margin-top:2px;overflow:hidden;
}
.ai-db-msg-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.ai-db-avatar-fallback{font-size:14px;font-weight:700;color:#fff}
.ai-db-msg-avatar-bot{background:linear-gradient(135deg,#3776AB,#00D9FF);box-shadow:0 0 10px rgba(0,217,255,0.2)}
.ai-db-msg-avatar-user{background:linear-gradient(135deg,#F59E0B,#FFD43B);box-shadow:0 0 10px rgba(255,212,59,0.15)}

.ai-db-msg-content{min-width:0}
.ai-db-msg-nick{font-size:0.72rem;margin-bottom:2px;font-weight:600;letter-spacing:0.5px}
.ai-db-msg-nick-bot{color:#00D9FF}
.ai-db-msg-user .ai-db-msg-nick{color:#FFD43B;text-align:right}
.ai-db-msg-bubble{
  padding:0.75rem 1rem;border-radius:14px;
  font-size:0.88rem;line-height:1.7;min-width:60px;
  position:relative;
}
.ai-db-msg-bot .ai-db-msg-bubble{
  background:rgba(22,30,46,0.8);
  border:1px solid rgba(55,118,171,0.1);
  color:#E5E7EB;border-top-left-radius:4px;
}
.ai-db-msg-user .ai-db-msg-bubble{
  background:linear-gradient(135deg,rgba(55,118,171,0.25),rgba(0,217,255,0.12));
  border:1px solid rgba(0,217,255,0.15);
  color:#E5E7EB;border-top-right-radius:4px;
}
.ai-db-msg-bubble pre{background:rgba(0,0,0,0.3);padding:0.8rem;border-radius:8px;overflow-x:auto;margin:0.5rem 0;font-family:'Fira Code',monospace;font-size:0.8rem;border:1px solid rgba(0,217,255,0.06)}
.ai-db-msg-bubble code{font-family:'Fira Code',monospace;font-size:0.82rem;background:rgba(0,0,0,0.2);padding:1px 4px;border-radius:3px}
.ai-db-msg-bubble img{max-width:100%;border-radius:10px;margin:0.5rem 0;box-shadow:0 4px 20px rgba(0,0,0,0.3)}
.ai-db-msg-bubble video{max-width:100%;border-radius:10px;margin:0.5rem 0}

/* 打字动画 */
.ai-db-typing{display:flex;gap:5px;padding:0.4rem 0}
.ai-db-typing span{width:7px;height:7px;border-radius:50%;background:#00D9FF;opacity:0.3;animation:dbTyping 1.4s ease-in-out infinite}
.ai-db-typing span:nth-child(2){animation-delay:0.2s}
.ai-db-typing span:nth-child(3){animation-delay:0.4s}
@keyframes dbTyping{0%,60%,100%{transform:translateY(0);opacity:0.3}30%{transform:translateY(-8px);opacity:1}}

/* 生成加载 */
.ai-db-gen-loading{display:flex;align-items:center;gap:0.6rem;color:#6B7280;font-size:0.85rem}
.ai-db-gen-spinner{
  width:18px;height:18px;border-radius:50%;
  border:2px solid rgba(0,217,255,0.15);border-top-color:#00D9FF;
  animation:dbSpin 0.8s linear infinite;
}
@keyframes dbSpin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}
.ai-db-gen-image img{border-radius:10px;box-shadow:0 4px 24px rgba(0,0,0,0.3)}

/* ── 输入区 ── */
.ai-db-input-area{
  padding:0.8rem 1.5rem 1rem;
  border-top:1px solid rgba(255,212,59,0.15);
  background:rgba(14,20,33,0.85);backdrop-filter:blur(16px);
  position:relative;z-index:1;
}
.ai-db-input-area::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,212,59,0.4),rgba(0,217,255,0.4),transparent);
}
.ai-db-input-wrap{display:flex;gap:0.5rem;align-items:flex-end;max-width:800px;margin:0 auto}
.ai-db-input-wrap textarea{
  flex:1;resize:none;
  background:linear-gradient(135deg,rgba(255,212,59,0.06),rgba(55,118,171,0.08));
  border:1.5px solid rgba(255,212,59,0.25);
  border-radius:14px;padding:0.7rem 1.1rem;
  color:#E5E7EB;font-size:0.88rem;font-family:inherit;
  max-height:120px;min-height:44px;line-height:1.5;
  transition:all 0.3s;outline:none;
  box-shadow:inset 0 1px 3px rgba(0,0,0,0.2),0 0 8px rgba(255,212,59,0.04);
}
.ai-db-input-wrap textarea::placeholder{color:#6B7280}
.ai-db-input-wrap textarea:focus{
  border-color:rgba(255,212,59,0.55);
  box-shadow:0 0 0 3px rgba(255,212,59,0.08),0 0 20px rgba(255,212,59,0.1),inset 0 1px 3px rgba(0,0,0,0.2);
}
.ai-db-send-btn{
  width:44px;height:44px;border-radius:14px;border:none;
  background:linear-gradient(135deg,#FFD43B,#F59E0B);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:all 0.3s;flex-shrink:0;
  box-shadow:0 2px 10px rgba(255,212,59,0.2);
}
.ai-db-send-btn:hover{transform:scale(1.08);box-shadow:0 0 20px rgba(255,212,59,0.35)}
.ai-db-send-btn:disabled{opacity:0.35;cursor:not-allowed;transform:none;box-shadow:none}
.ai-db-send-btn svg{stroke:#0a0e1a;stroke-width:2.5}
.ai-db-input-hint{text-align:center;font-size:0.65rem;color:#4B5563;margin-top:0.4rem}

/* ── 付款弹窗 - 与赞助弹窗一致 ── */
.ai-pay-sponsor-box .sponsor-header h3{color:#FFD43B}
.ai-pay-sponsor-box .sponsor-right{
  display:flex;flex-direction:column;align-items:center;
  justify-content:flex-start;
}
/* 验证交易号（在右侧二维码下方） */
.ai-pay-verify-inline{
  width:100%;margin-top:0.8rem;padding-top:0.8rem;
  border-top:1px solid rgba(255,255,255,0.06);
}
.ai-pay-verify-label{font-size:0.68rem;color:rgba(255,255,255,0.35);margin-bottom:0.4rem;text-align:center}
.ai-pay-verify-row{display:flex;gap:0.4rem}
.ai-pay-trade-input{
  flex:1;padding:0.4rem 0.6rem;border-radius:6px;
  border:1px solid rgba(0,217,255,0.12);
  background:rgba(17,24,39,0.6);color:#E5E7EB;
  font-size:0.78rem;outline:none;transition:all 0.3s;
}
.ai-pay-trade-input::placeholder{color:#4B5563}
.ai-pay-trade-input:focus{border-color:rgba(0,217,255,0.35)}
.ai-pay-verify-btn{
  padding:0.4rem 0.8rem;border-radius:6px;border:none;
  background:linear-gradient(135deg,#3776AB,#00D9FF);
  color:#fff;font-size:0.78rem;font-weight:600;
  cursor:pointer;transition:all 0.3s;white-space:nowrap;
}
.ai-pay-verify-btn:hover{box-shadow:0 0 10px rgba(0,217,255,0.3);transform:translateY(-1px)}
.ai-pay-verify-status{font-size:0.72rem;margin-top:0.3rem;text-align:center;min-height:1rem}
.ai-pay-verify-status.success{color:#10B981}
.ai-pay-verify-status.error{color:#EF4444}

/* ── 响应式 ── */
@media(max-width:768px){
  .ai-db-sidebar{position:fixed;left:0;top:0;bottom:0;z-index:50;margin-left:-260px}
  .ai-db-sidebar.open{margin-left:0;box-shadow:4px 0 24px rgba(0,0,0,0.4)}
  .ai-db-sidebar.collapsed{margin-left:-260px}
  .ai-db-main::before{left:0}
  .ai-db-quick-grid{grid-template-columns:1fr}
  .ai-db-msg{max-width:90%}
  .ai-db-welcome-title{font-size:1.2rem}
  .ai-db-welcome-desc{font-size:0.82rem}
}


/* ===== 关于页面 - 超酷特效版 ===== */
.about-page{position:relative;overflow:hidden}
/* Hero */
.about-hero{position:relative;padding:4rem 2rem 3rem;text-align:center;overflow:hidden}
.about-hero::before{content:'';position:absolute;top:-50%;left:50%;transform:translateX(-50%);width:600px;height:600px;background:radial-gradient(circle,rgba(0,217,255,0.08) 0%,transparent 70%);pointer-events:none}
.about-hero::after{content:'';position:absolute;inset:0;background:
  linear-gradient(90deg,rgba(0,217,255,0.03) 1px,transparent 1px),
  linear-gradient(0deg,rgba(0,217,255,0.03) 1px,transparent 1px);
  background-size:60px 60px;pointer-events:none;animation:gridMove 20s linear infinite}
@keyframes gridMove{0%{transform:translateY(0)}100%{transform:translateY(60px)}}
/* 旋转光圈 */
.about-orbit{position:absolute;top:50%;left:50%;width:500px;height:500px;border:1px solid rgba(0,217,255,0.06);border-radius:50%;transform:translate(-50%,-50%);animation:orbitSpin 30s linear infinite}
.about-orbit-2{width:650px;height:650px;animation-duration:45s;animation-direction:reverse;border-color:rgba(55,118,171,0.05)}
.about-orbit-3{width:350px;height:350px;animation-duration:20s;border-color:rgba(255,212,59,0.04)}
@keyframes orbitSpin{0%{transform:translate(-50%,-50%) rotate(0deg)}100%{transform:translate(-50%,-50%) rotate(360deg)}}
/* 头像 */
.about-avatar-wrap{position:relative;width:140px;height:140px;margin:0 auto 2rem;z-index:2}
.about-avatar-ring{position:absolute;inset:-6px;border-radius:50%;border:2px solid transparent;border-top-color:var(--ai-cyan);border-right-color:var(--python-blue);animation:avatarRingSpin 3s linear infinite}
.about-avatar-ring-2{inset:-12px;border-top-color:var(--python-yellow);border-left-color:var(--ai-cyan);animation-duration:5s;animation-direction:reverse}
@keyframes avatarRingSpin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}
.about-avatar-inner{width:100%;height:100%;border-radius:50%;background:linear-gradient(135deg,var(--python-blue),var(--ai-cyan));display:flex;align-items:center;justify-content:center;font-family:'Orbitron',sans-serif;font-size:3rem;font-weight:700;color:#fff;text-shadow:0 0 20px rgba(0,217,255,0.5);position:relative;z-index:1}
.about-avatar-glow{position:absolute;inset:-20px;border-radius:50%;background:radial-gradient(circle,rgba(0,217,255,0.25) 0%,transparent 70%);animation:glowPulse 3s ease-in-out infinite alternate;z-index:0}
@keyframes glowPulse{0%{opacity:0.4;transform:scale(0.95)}100%{opacity:0.7;transform:scale(1.05)}}
/* 名字 */
.about-name{font-family:'Orbitron',sans-serif;font-size:2.4rem;font-weight:700;background:linear-gradient(90deg,#3776AB,#00D9FF,#3776AB);background-size:200% auto;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:nameShimmer 4s linear infinite;margin-bottom:0.3rem;position:relative;z-index:2}
@keyframes nameShimmer{0%{background-position:0% center}100%{background-position:200% center}}
.about-en-name{font-family:'Orbitron',sans-serif;font-size:1rem;color:var(--ai-cyan);letter-spacing:4px;margin-bottom:1rem;opacity:0.7;position:relative;z-index:2}
.about-role-tags{display:flex;gap:0.6rem;justify-content:center;flex-wrap:wrap;margin-bottom:1.5rem;position:relative;z-index:2}
.about-role-tag{padding:0.35rem 1rem;border-radius:20px;font-size:0.82rem;font-weight:500;border:1px solid;backdrop-filter:blur(6px)}
.about-role-tag.t-blue{border-color:rgba(55,118,171,0.4);background:rgba(55,118,171,0.12);color:#60A5FA}
.about-role-tag.t-yellow{border-color:rgba(255,212,59,0.4);background:rgba(255,212,59,0.1);color:var(--python-yellow)}
.about-role-tag.t-cyan{border-color:rgba(0,217,255,0.4);background:rgba(0,217,255,0.1);color:var(--ai-cyan)}
.about-bio{font-size:0.95rem;color:var(--text-secondary);max-width:560px;margin:0 auto;line-height:1.8;position:relative;z-index:2}
.about-slogan{font-size:0.85rem;color:var(--ai-cyan);max-width:480px;margin:0.8rem auto 0;line-height:1.6;position:relative;z-index:2;font-style:italic;text-align:center;opacity:0.85;letter-spacing:0.5px}
/* 信息条 */
.about-info-bar{display:flex;gap:1.5rem;justify-content:center;flex-wrap:wrap;margin:1.5rem 0 0;position:relative;z-index:2}
.about-info-chip{display:flex;align-items:center;gap:0.4rem;font-size:0.82rem;color:var(--text-muted);padding:0.3rem 0.8rem;background:rgba(17,24,39,0.4);border-radius:20px;border:1px solid rgba(55,118,171,0.15)}
.about-info-chip svg{width:14px;height:14px;flex-shrink:0}
/* 通用 section */
.about-section{padding:2.5rem 1.5rem;max-width:960px;margin:0 auto}
.about-section-header{text-align:center;margin-bottom:2rem}
.about-section-tag{font-family:'Fira Code',monospace;font-size:0.72rem;color:var(--ai-cyan);opacity:0.6;letter-spacing:2px;margin-bottom:0.4rem}
.about-section-title{font-family:'Orbitron',sans-serif;font-size:1.4rem;color:var(--text-primary);font-weight:600}
.about-section-line{width:60px;height:3px;background:linear-gradient(90deg,var(--python-blue),var(--ai-cyan));margin:0.8rem auto 0;border-radius:2px;box-shadow:0 0 12px rgba(0,217,255,0.3)}
/* 统计 */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.stat-card{text-align:center;padding:1.5rem 0.8rem;background:rgba(17,24,39,0.4);border:1px solid rgba(55,118,171,0.15);border-radius:14px;backdrop-filter:blur(10px);transition:all 0.4s;position:relative;overflow:hidden}
.stat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--ai-cyan),transparent);opacity:0;transition:opacity 0.3s}
.stat-card:hover{border-color:var(--ai-cyan);transform:translateY(-5px);box-shadow:0 8px 30px rgba(0,217,255,0.12)}
.stat-card:hover::before{opacity:1}
.stat-number{font-family:'Orbitron',sans-serif;font-size:2rem;font-weight:700;background:linear-gradient(90deg,var(--python-blue),var(--ai-cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-suffix{font-size:0.9rem}
.stat-label{font-size:0.75rem;color:var(--text-muted);margin-top:0.3rem}
/* 技能 */
.skill-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.skill-item{padding:1.2rem;background:rgba(17,24,39,0.4);border:1px solid rgba(55,118,171,0.15);border-radius:14px;backdrop-filter:blur(10px);transition:all 0.4s;position:relative;overflow:hidden}
.skill-item::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,217,255,0.03),transparent);opacity:0;transition:opacity 0.3s}
.skill-item:hover{border-color:var(--ai-cyan);transform:translateY(-3px);box-shadow:0 4px 20px rgba(0,217,255,0.1)}
.skill-item:hover::after{opacity:1}
.skill-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:0.7rem}
.skill-name{font-size:0.92rem;font-weight:500;color:var(--text-primary)}
.skill-pct{font-family:'Fira Code',monospace;font-size:0.78rem;color:var(--ai-cyan)}
.skill-bar-track{height:6px;background:rgba(255,255,255,0.05);border-radius:3px;overflow:hidden}
.skill-bar-fill{height:100%;border-radius:3px;width:0;transition:width 1.5s cubic-bezier(0.22,0.61,0.36,1);position:relative}
.skill-bar-fill::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.25),transparent);animation:skillShine 2.5s ease-in-out infinite}
@keyframes skillShine{0%,100%{transform:translateX(-100%)}50%{transform:translateX(100%)}}
.skill-bar-fill.bar-blue{background:linear-gradient(90deg,#3776AB,#60A5FA)}
.skill-bar-fill.bar-yellow{background:linear-gradient(90deg,#F59E0B,#FFD43B)}
.skill-bar-fill.bar-cyan{background:linear-gradient(90deg,#0891B2,#00D9FF)}
.skill-bar-fill.bar-green{background:linear-gradient(90deg,#059669,#10B981)}
.skill-bar-fill.bar-purple{background:linear-gradient(90deg,#7C3AED,#A78BFA)}
.skill-bar-fill.bar-pink{background:linear-gradient(90deg,#DB2777,#F472B6)}
.skill-bar-fill.bar-orange{background:linear-gradient(90deg,#EA580C,#FB923C)}
.skill-bar-fill.bar-red{background:linear-gradient(90deg,#DC2626,#F87171)}
/* 技术栈 */
.tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0.8rem}
.tech-card{display:flex;flex-direction:column;align-items:center;gap:0.5rem;padding:1rem 0.6rem;background:rgba(17,24,39,0.4);border:1px solid rgba(55,118,171,0.12);border-radius:12px;backdrop-filter:blur(8px);transition:all 0.3s;cursor:default}
.tech-card:hover{border-color:var(--ai-cyan);transform:translateY(-3px) scale(1.02);box-shadow:0 4px 16px rgba(0,217,255,0.1)}
.tech-card-icon{font-size:1.8rem}
.tech-card-name{font-size:0.78rem;color:var(--text-secondary);font-weight:500}
/* 时间线 */
.timeline{position:relative;padding-left:2.5rem}
.timeline::before{content:'';position:absolute;left:10px;top:8px;bottom:8px;width:2px;background:linear-gradient(180deg,var(--python-blue),var(--ai-cyan),var(--python-yellow));border-radius:1px}
.timeline-item{position:relative;padding-bottom:1.8rem;opacity:0;transform:translateX(-20px);transition:all 0.5s}
.timeline-item.visible{opacity:1;transform:translateX(0)}
.timeline-item:last-child{padding-bottom:0}
.timeline-dot{position:absolute;left:-2.5rem;top:6px;width:18px;height:18px;border-radius:50%;border:2px solid var(--ai-cyan);background:var(--bg-primary);z-index:1;transition:all 0.3s}
.timeline-dot::after{content:'';position:absolute;inset:4px;border-radius:50%;background:var(--ai-cyan);opacity:0;transition:all 0.3s}
.timeline-item:hover .timeline-dot{box-shadow:0 0 12px rgba(0,217,255,0.4)}
.timeline-item:hover .timeline-dot::after{opacity:1}
.timeline-date{font-family:'Orbitron',sans-serif;font-size:0.78rem;color:var(--ai-cyan);margin-bottom:0.3rem}
.timeline-title{font-size:0.95rem;font-weight:600;color:var(--text-primary);margin-bottom:0.2rem}
.timeline-desc{font-size:0.82rem;color:var(--text-muted);line-height:1.6}
/* 名言 */
.quote-card{position:relative;padding:2.5rem;background:rgba(17,24,39,0.45);border:1px solid rgba(0,217,255,0.15);border-radius:18px;backdrop-filter:blur(12px);text-align:center;overflow:hidden}
.quote-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--ai-cyan),transparent)}
.quote-card::after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--python-yellow),transparent)}
.quote-mark{font-size:3.5rem;line-height:1;color:var(--ai-cyan);opacity:0.2;font-family:Georgia,serif}
.quote-text{font-size:1.1rem;color:var(--text-primary);line-height:1.9;margin:0.8rem 0;font-style:italic}
.quote-author{font-size:0.85rem;color:var(--python-yellow)}
/* 联系 */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.contact-card{padding:1.5rem;background:rgba(17,24,39,0.4);border:1px solid rgba(55,118,171,0.15);border-radius:16px;backdrop-filter:blur(10px);text-align:center;transition:all 0.4s;cursor:pointer;position:relative;overflow:hidden}
.contact-card::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 50% 0%,rgba(0,217,255,0.06),transparent 70%);opacity:0;transition:opacity 0.3s}
.contact-card:hover{border-color:var(--ai-cyan);transform:translateY(-6px);box-shadow:0 10px 30px rgba(0,217,255,0.12)}
.contact-card:hover::before{opacity:1}
.contact-icon{font-size:2rem;margin-bottom:0.6rem}
.contact-name{font-size:0.8rem;color:var(--text-muted);margin-bottom:0.3rem}
.contact-value{font-size:0.88rem;color:var(--text-primary);font-weight:500;word-break:break-all}
.contact-value a{color:var(--ai-cyan);text-decoration:none}
.contact-value a:hover{text-decoration:underline}
/* 响应式 */
@media(max-width:1024px){.stat-grid{grid-template-columns:repeat(2,1fr)}.skill-grid{grid-template-columns:1fr}.contact-grid{grid-template-columns:1fr 1fr}.tech-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:768px){.stat-grid{grid-template-columns:1fr 1fr}.contact-grid{grid-template-columns:1fr}.about-name{font-size:1.8rem}.about-avatar-wrap{width:110px;height:110px}.about-info-bar{flex-direction:column;align-items:center}.tech-grid{grid-template-columns:repeat(2,1fr)}}