/* ============================================
   五一网 - 赛博青紫素材库风格
   主色: #00E5FF | 辅助色: #D500F9
   背景: #1E1E24 | 卡片: #2A2D3E | 正文: #E0E0E0
   ============================================ */

/* CSS变量定义 */
:root {
  --cyber-cyan: #00E5FF;
  --neon-purple: #D500F9;
  --bg-dark: #1E1E24;
  --card-bg: #2A2D3E;
  --text-main: #E0E0E0;
  --text-muted: #9E9E9E;
  --border-glow: rgba(0, 229, 255, 0.3);
  --purple-glow: rgba(213, 0, 249, 0.3);
  --gradient-main: linear-gradient(135deg, #00E5FF, #D500F9);
  --font-main: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.2);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --max-width: 1400px;
}

/* 重置与基础 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--neon-purple);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* 容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.cyber-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(30, 30, 36, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-glow);
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  color: var(--text-main);
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width var(--transition-normal);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--cyber-cyan);
  transition: var(--transition-normal);
}

/* 首屏英雄区 */
.hero-section {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(30,30,36,0.3) 0%, rgba(30,30,36,0.95) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}

/* 搜索框 */
.search-box {
  position: relative;
  max-width: 640px;
  margin: 0 auto 32px;
}

.search-box input {
  width: 100%;
  padding: 18px 60px 18px 24px;
  border: 2px solid var(--border-glow);
  border-radius: 50px;
  background: var(--card-bg);
  color: var(--text-main);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.search-box input:focus {
  border-color: var(--cyber-cyan);
  box-shadow: var(--shadow-glow);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.search-box button:hover {
  transform: translateY(-50%) scale(1.1);
}

/* 热门标签 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 20px;
}

.tag-item {
  padding: 6px 16px;
  border: 1px solid var(--border-glow);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tag-item:hover {
  border-color: var(--cyber-cyan);
  background: rgba(0, 229, 255, 0.1);
  color: var(--cyber-cyan);
}

.tag-item::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s, height 0.5s;
}

.tag-item:active::before {
  width: 200px;
  height: 200px;
}

/* 区块标题 */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.15);
}

.section-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  position: relative;
  padding-left: 16px;
}

.section-header h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--gradient-main);
  border-radius: 2px;
}

.section-header .more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border: 1px solid var(--cyber-cyan);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--cyber-cyan);
  transition: all var(--transition-normal);
}

.section-header .more-link:hover {
  background: var(--cyber-cyan);
  color: var(--bg-dark);
}

/* 内容区块 */
.content-section {
  padding: 80px 0;
}

.content-section:nth-child(even) {
  background: rgba(42, 45, 62, 0.3);
}

/* 网格布局 */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* 视频卡片 */
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(0, 229, 255, 0.1);
  transition: all var(--transition-normal);
  position: relative;
}

.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyber-cyan);
  box-shadow: var(--shadow-glow);
}

.video-card .card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.video-card .card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.video-card:hover .card-thumb img {
  transform: scale(1.05);
}

.video-card .card-thumb .play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.video-card:hover .card-thumb .play-overlay {
  opacity: 1;
}

.play-overlay .play-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
}

.video-card .card-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 10px;
  background: rgba(0, 229, 255, 0.9);
  color: var(--bg-dark);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
}

.video-card .card-info {
  padding: 16px;
}

.video-card .card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card .card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.video-card .card-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 下载按钮 - 流光边框 */
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--gradient-main);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast);
}

.btn-download:hover {
  transform: scale(1.05);
}

.btn-download::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, #00E5FF, #D500F9, #00E5FF, #D500F9);
  background-size: 400% 400%;
  z-index: -1;
  border-radius: inherit;
  animation: glowBorder 3s ease infinite;
}

@keyframes glowBorder {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid var(--cyber-cyan);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--cyber-cyan);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.1);
}

/* 筛选器 */
.filter-panel {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
  border: 1px solid rgba(0, 229, 255, 0.1);
}

.filter-group {
  margin-bottom: 16px;
}

.filter-group:last-child {
  margin-bottom: 0;
}

.filter-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-btn {
  padding: 6px 14px;
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 4px;
  background: transparent;
  color: var(--text-main);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--cyber-cyan);
  color: var(--bg-dark);
  border-color: var(--cyber-cyan);
}

/* Before/After对比器 */
.compare-slider {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--border-glow);
}

.compare-slider img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.compare-slider .slider-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: var(--cyber-cyan);
  cursor: ew-resize;
  z-index: 10;
}

.compare-slider .slider-handle::after {
  content: '⟨⟩';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--cyber-cyan);
  color: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: bold;
}

/* 音效波形组件 */
.waveform-player {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid rgba(0, 229, 255, 0.1);
}

.waveform-visual {
  height: 60px;
  background: linear-gradient(90deg, var(--cyber-cyan), var(--neon-purple));
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 60'%3E%3Crect x='0' y='20' width='3' height='20' rx='1'/%3E%3Crect x='5' y='10' width='3' height='40' rx='1'/%3E%3Crect x='10' y='15' width='3' height='30' rx='1'/%3E%3Crect x='15' y='5' width='3' height='50' rx='1'/%3E%3Crect x='20' y='18' width='3' height='24' rx='1'/%3E%3Crect x='25' y='8' width='3' height='44' rx='1'/%3E%3Crect x='30' y='22' width='3' height='16' rx='1'/%3E%3Crect x='35' y='12' width='3' height='36' rx='1'/%3E%3Crect x='40' y='3' width='3' height='54' rx='1'/%3E%3Crect x='45' y='16' width='3' height='28' rx='1'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 60'%3E%3Crect x='0' y='20' width='3' height='20' rx='1'/%3E%3Crect x='5' y='10' width='3' height='40' rx='1'/%3E%3Crect x='10' y='15' width='3' height='30' rx='1'/%3E%3Crect x='15' y='5' width='3' height='50' rx='1'/%3E%3Crect x='20' y='18' width='3' height='24' rx='1'/%3E%3Crect x='25' y='8' width='3' height='44' rx='1'/%3E%3Crect x='30' y='22' width='3' height='16' rx='1'/%3E%3Crect x='35' y='12' width='3' height='36' rx='1'/%3E%3Crect x='40' y='3' width='3' height='54' rx='1'/%3E%3Crect x='45' y='16' width='3' height='28' rx='1'/%3E%3C/svg%3E");
  mask-repeat: repeat-x;
  -webkit-mask-repeat: repeat-x;
  mask-size: 50px 60px;
  -webkit-mask-size: 50px 60px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.waveform-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.waveform-controls .play-btn-sm {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-main);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 页脚 */
.cyber-footer {
  background: rgba(20, 20, 26, 0.95);
  border-top: 1px solid var(--border-glow);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.7;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--cyber-cyan);
}

.footer-links a {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--cyber-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(0, 229, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* 面包屑 */
.breadcrumb {
  padding: 100px 0 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--cyber-cyan);
}

.breadcrumb span {
  margin: 0 8px;
}

/* 详情页 */
.detail-hero {
  padding: 100px 0 40px;
}

.detail-content {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 40px;
  padding-bottom: 80px;
}

.detail-main {
  min-width: 0;
}

.detail-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
}

.sidebar-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid rgba(0, 229, 255, 0.1);
  margin-bottom: 24px;
}

.sidebar-card h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
}

.info-list {
  list-style: none;
}

.info-list li {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.9rem;
}

.info-list li:last-child {
  border-bottom: none;
}

.info-list .label {
  color: var(--text-muted);
}

.info-list .value {
  color: var(--cyber-cyan);
  font-weight: 500;
}

/* FAQ手风琴 */
.faq-section {
  margin-top: 48px;
}

.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid rgba(0, 229, 255, 0.1);
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: rgba(0, 229, 255, 0.05);
}

.faq-question .icon {
  transition: transform var(--transition-normal);
  color: var(--cyber-cyan);
}

.faq-item.active .faq-question .icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 18px;
}

.faq-answer p {
  color: var(--text-muted);
  line-height: 1.8;
}

/* 页面标题区 */
.page-hero {
  padding: 120px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(0,229,255,0.08) 0%, transparent 70%);
}

.page-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* 文章内容 */
.article-content {
  line-height: 2;
  font-size: 1rem;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  padding-left: 12px;
  border-left: 3px solid var(--cyber-cyan);
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
  color: var(--cyber-cyan);
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
  list-style: disc;
  color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .detail-content { grid-template-columns: 1fr; }
  .detail-sidebar { position: static; }
}

@media (max-width: 768px) {
  .nav-links { 
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(30, 30, 36, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-glow);
  }
  .nav-links.active { display: flex; }
  .nav-toggle { display: flex; }
  .hero-content h1 { font-size: 2rem; }
  .grid-4 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-header { flex-direction: column; gap: 12px; align-items: flex-start; }
  .page-hero h1 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.6rem; }
  .container { padding: 0 16px; }
  .content-section { padding: 48px 0; }
}

/* 动画 */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--card-bg);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--cyber-cyan);
}

/* 合规页面 */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.legal-content h1 {
  font-size: 2rem;
  margin-bottom: 32px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.legal-content h2 {
  font-size: 1.3rem;
  margin: 32px 0 12px;
  color: var(--cyber-cyan);
}

.legal-content p {
  margin-bottom: 16px;
  color: var(--text-muted);
  line-height: 1.9;
}

/* 搜索结果 */
.search-results {
  padding: 32px 0;
}

.search-result-item {
  padding: 20px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid rgba(0, 229, 255, 0.1);
  transition: border-color var(--transition-fast);
}

.search-result-item:hover {
  border-color: var(--cyber-cyan);
}

.search-result-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.search-result-item p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.search-result-item .result-url {
  color: var(--neon-purple);
  font-size: 0.8rem;
  margin-top: 6px;
}

/* APP下载页 */
.app-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 0;
}

.app-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  list-style: none;
}

.app-features .feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(0, 229, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyber-cyan);
  flex-shrink: 0;
}

/* 视频预览播放器 */
.video-preview-container {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  border: 2px solid var(--border-glow);
}

.video-preview-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-preview-container .preview-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-bar {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.2);
  border-radius: 2px;
  position: relative;
}

.progress-bar .progress {
  height: 100%;
  background: var(--gradient-main);
  border-radius: 2px;
  width: 35%;
}