/* ============================================
   51视频 - 原创样式表
   品牌：51视频 | 域名：qLvqbg.cn
   定位：国内影视传媒公司 + 动漫社区
   ============================================ */

/* CSS Variables */
:root {
  --primary: #1A0B2E;
  --secondary: #FF6B35;
  --accent: #00D4AA;
  --bg-dark: #0F0A1A;
  --card-bg: #1E1533;
  --card-hover: #2A1F42;
  --text-main: #E8E0F0;
  --text-sub: #9B8FB8;
  --gradient-start: #FF6B35;
  --gradient-end: #FF3CAC;
  --border-color: #2D2247;
  --success: #00D4AA;
  --warning: #FFB347;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --bg-card: var(--card-bg);
  --border: var(--border-color);
  --text-main: #E8E0F0;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.4);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ============ Header / Navigation ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 10, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { height: 42px; width: auto; }
.logo-text {
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--secondary);
  background: rgba(255, 107, 53, 0.1);
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--secondary);
  border-radius: 2px;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* ============ Search Bar ============ */
.search-bar-wrap {
  background: var(--primary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  margin-top: 68px;
}
.search-bar {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  gap: 0;
  position: relative;
}
.search-bar input {
  flex: 1;
  padding: 12px 20px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-right: none;
  border-radius: var(--radius) 0 0 var(--radius);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-bar input:focus { border-color: var(--secondary); }
.search-bar input::placeholder { color: var(--text-sub); }
.search-bar button {
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.search-bar button:hover { opacity: 0.9; transform: scale(1.02); }

/* ============ Hero Section ============ */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.5);
}
.hero-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(180deg, rgba(15,10,26,0.3) 0%, rgba(15,10,26,0.85) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 20px 60px;
  text-align: center;
}
.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}
.hero-content h1 .brand-highlight {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem;
  color: var(--text-sub);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 32px; }
.hero-tags span {
  padding: 6px 16px;
  background: rgba(255, 107, 53, 0.15);
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--secondary);
}
.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(255, 107, 53, 0.5);
  color: #fff;
}
.btn-outline {
  display: inline-block;
  padding: 14px 36px;
  background: transparent;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 600;
  border-radius: 30px;
  border: 2px solid var(--accent);
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover {
  background: var(--accent);
  color: var(--bg-dark);
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ============ Section Common ============ */
.section {
  padding: 72px 0;
  position: relative;
}
.section-alt { background: var(--primary); }
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-header h2 .hl {
  color: var(--secondary);
}
.section-header p {
  color: var(--text-sub);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}
.section-header .divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ============ Video Card Grid ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border-color);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--secondary);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/4;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 64px; height: 64px;
  background: rgba(255, 107, 53, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.5);
}
.play-btn::after {
  content: '';
  display: block;
  width: 0; height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-btn { transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  color: var(--text-sub);
  font-size: 0.82rem;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.video-tags span {
  padding: 2px 10px;
  background: rgba(0, 212, 170, 0.1);
  border: 1px solid rgba(0, 212, 170, 0.25);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--accent);
}

/* ============ Feature Grid ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--secondary);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-sub); font-size: 0.9rem; }

/* ============ Expert Section ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.expert-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.expert-avatar {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}
.expert-info { padding: 20px 16px; }
.expert-info h4 { font-size: 1.05rem; margin-bottom: 4px; }
.expert-info .role { color: var(--secondary); font-size: 0.85rem; margin-bottom: 8px; }
.expert-info p { color: var(--text-sub); font-size: 0.82rem; margin-bottom: 12px; }
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btns a {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}
.expert-btns .btn-sm-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
}
.expert-btns .btn-sm-outline {
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* ============ Partner Logos ============ */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  align-items: center;
}
.partner-logo {
  padding: 16px 28px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-sub);
  transition: var(--transition);
}
.partner-logo:hover {
  border-color: var(--secondary);
  color: var(--text-main);
}

/* ============ Reviews ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); }
.review-stars { color: #FFB347; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { color: var(--text-main); font-size: 0.95rem; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}
.review-author-info .name { font-weight: 600; font-size: 0.9rem; }
.review-author-info .date { color: var(--text-sub); font-size: 0.8rem; }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--secondary); }
.faq-question .arrow {
  transition: var(--transition);
  font-size: 1.2rem;
  color: var(--text-sub);
}
.faq-item.active .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-sub);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ============ Contact Section ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.contact-info-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-info-card h3 { font-size: 1.2rem; margin-bottom: 20px; color: var(--secondary); }
.contact-item {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: flex-start;
}
.contact-item .icon {
  width: 36px; height: 36px;
  background: rgba(255, 107, 53, 0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--secondary);
  font-size: 1rem;
}
.contact-item .text { font-size: 0.9rem; }
.contact-item .label { color: var(--text-sub); font-size: 0.8rem; }

/* ============ How-To Guide ============ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.howto-step {
  text-align: center;
  position: relative;
}
.step-number {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 auto 16px;
}
.howto-step h4 { font-size: 1rem; margin-bottom: 8px; }
.howto-step p { color: var(--text-sub); font-size: 0.85rem; }

/* ============ Share Buttons ============ */
.share-wrap {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.share-btn {
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* ============ Footer ============ */
.site-footer {
  background: var(--primary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p { color: var(--text-sub); font-size: 0.9rem; margin-top: 12px; }
.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--secondary);
}
.footer-col a {
  display: block;
  color: var(--text-sub);
  font-size: 0.88rem;
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--text-main); padding-left: 4px; }
.footer-qr {
  display: flex;
  gap: 24px;
  margin-top: 20px;
}
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 120px; height: 120px; border-radius: var(--radius-sm); }
.footer-qr-item span { display: block; font-size: 0.8rem; color: var(--text-sub); margin-top: 6px; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.85rem;
}
.footer-bottom .update-time { margin-top: 4px; }

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 16px 0;
  margin-top: 68px;
}
.breadcrumb-list {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.88rem;
  color: var(--text-sub);
}
.breadcrumb-list a { color: var(--text-sub); }
.breadcrumb-list a:hover { color: var(--secondary); }
.breadcrumb-list .sep { color: var(--border-color); }

/* ============ Inner Page Content ============ */
.page-hero {
  padding: 48px 0;
  text-align: center;
  background: var(--primary);
  border-bottom: 1px solid var(--border-color);
}
.page-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.page-hero p { color: var(--text-sub); max-width: 600px; margin: 0 auto; }

.content-section { padding: 48px 0; }
.content-section h2 { font-size: 1.6rem; margin-bottom: 20px; }
.content-section p { color: var(--text-sub); margin-bottom: 16px; line-height: 1.8; }

/* ============ MCP Service Frontend ============ */
.mcp-widget {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
}
.mcp-widget h4 { font-size: 1rem; margin-bottom: 12px; color: var(--accent); }
.mcp-status {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-sub);
}
.mcp-dot {
  width: 8px; height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(15, 10, 26, 0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; width: 100%; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content p { font-size: 1rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 1.5rem; }
  .search-bar { flex-direction: column; }
  .search-bar input { border-right: 2px solid var(--border-color); border-radius: var(--radius); }
  .search-bar button { border-radius: var(--radius); }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .partner-wall { gap: 16px; }
  .partner-logo { padding: 12px 20px; font-size: 0.95rem; }
}

/* ============ Utility ============ */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.hidden { display: none; }

/* Lazy load placeholder */
.lazy-img {
  background: var(--card-bg);
  transition: opacity 0.5s ease;
}
.lazy-img[data-loaded="false"] { opacity: 0.3; }
.lazy-img[data-loaded="true"] { opacity: 1; }

/* ============ Video Modal ============ */
.video-modal-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.video-modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.video-modal {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 560px;
  width: 90%;
  text-align: center;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none;
  border: none;
  color: var(--text-sub);
  font-size: 1.5rem;
  cursor: pointer;
}
.video-modal-icon {
  width: 80px; height: 80px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50%;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-modal-icon::after {
  content: '';
  display: block;
  width: 0; height: 0;
  border-style: solid;
  border-width: 14px 0 14px 24px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-modal h3 { margin-bottom: 12px; font-size: 1.2rem; }
.video-modal p { color: var(--text-sub); font-size: 0.9rem; margin-bottom: 20px; }
.video-modal .progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}
.video-modal .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  border-radius: 3px;
  width: 0;
  animation: progressAnim 3s ease forwards;
}
@keyframes progressAnim {
  0% { width: 0; }
  100% { width: 65%; }
}

/* ============ Back to Top ============ */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(255,107,53,0.3);
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-4px);
}