```css
/* ============================================
   欲梦子影视 - 清新观影体验
   aupsxvg.cn
   设计理念：纯净、流畅、专业、舒适
   ============================================ */

/* ===== CSS 变量与主题系统 ===== */
:root {
  /* 主色板 - 清新蓝紫渐变系 */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;

  --accent-400: #22d3ee;
  --accent-500: #06b6d4;

  /* 中性色 */
  --neutral-50: #f8fafc;
  --neutral-100: #f1f5f9;
  --neutral-200: #e2e8f0;
  --neutral-300: #cbd5e1;
  --neutral-400: #94a3b8;
  --neutral-500: #64748b;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-800: #1e293b;
  --neutral-900: #0f172a;

  /* 语义色 */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* 主题变量（亮色模式默认） */
  --bg-body: var(--neutral-50);
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --bg-soft: var(--neutral-100);
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.9);

  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-600);
  --text-tertiary: var(--neutral-500);
  --text-on-accent: #ffffff;
  --text-heading: var(--neutral-900);

  --border-light: var(--neutral-200);
  --border-medium: var(--neutral-300);

  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.06), 0 1px 3px 0 rgba(15, 23, 42, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  --shadow-glow: 0 0 0 1px rgba(99, 102, 241, 0.1), 0 8px 32px -8px rgba(99, 102, 241, 0.25);

  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --gradient-hero: linear-gradient(135deg, #eef2ff 0%, #f0f9ff 50%, #fdf4ff 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", serif;

  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);

  --nav-height: 72px;
  --container-max: 1280px;
}

/* 暗色模式 */
[data-theme="dark"] {
  --bg-body: #0b1120;
  --bg-card: #111c2e;
  --bg-elevated: #1e293b;
  --bg-soft: #1e293b;
  --bg-glass: rgba(15, 23, 42, 0.72);
  --bg-glass-strong: rgba(15, 23, 42, 0.92);

  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --text-on-accent: #ffffff;
  --text-heading: #ffffff;

  --border-light: #334155;
  --border-medium: #475569;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3), 0 1px 3px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 0 1px rgba(99, 102, 241, 0.2), 0 8px 32px -8px rgba(99, 102, 241, 0.4);

  --gradient-primary: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #e879f9 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
  --gradient-card: linear-gradient(145deg, #1e293b 0%, #111c2e 100%);
}

/* ===== 基础重置与全局设置 ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-body);
  background-image: var(--gradient-hero);
  background-attachment: fixed;
  background-size: cover;
  min-height: 100vh;
  transition: var(--transition-base);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(217, 70, 239, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

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

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--primary-500);
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

ul,
ol {
  list-style-position: inside;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-heading);
  letter-spacing: -0.02em;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--neutral-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neutral-500);
}

::selection {
  background: var(--primary-200);
  color: var(--neutral-900);
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.navbar.scrolled {
  background: var(--bg-glass-strong);
  box-shadow: var(--shadow-md);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 1.5rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: var(--transition-base);
}

.logo:hover {
  transform: scale(1.02);
}

.logo span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 900;
}

.logo svg {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--gradient-primary);
  padding: 6px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
}

.nav-links li {
  position: relative;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
  transition: var(--transition-base);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--text-heading);
}

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

.nav-links a.active {
  color: var(--text-heading);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  border-color: var(--primary-400);
  color: var(--text-heading);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.theme-toggle .icon {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-heading);
  cursor: pointer;
  font-size: 1.5rem;
  align-items: center;
  justify-content: center;
  transition: var(--transition-base);
  z-index: 1001;
}

.mobile-menu-btn:hover {
  background: var(--bg-soft);
}

/* ===== Hero Banner 区域 ===== */
.hero {
  padding: 4rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(99, 102, 241, 0.1) 0%, transparent 40%),
              radial-gradient(circle at 70% 60%, rgba(217, 70, 239, 0.08) 0%, transparent 40%);
  animation: heroFloat 20s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

@keyframes heroFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-2%, 2%) scale(1.05); }
  100% { transform: translate(2%, -2%) scale(1.1); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

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

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.15;
  margin-bottom: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-heading) 30%, var(--primary-600) 70%, var(--accent-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

[data-theme="dark"] .hero h1 {
  background: linear-gradient(135deg, #ffffff 30%, #a78bfa 70%, #22d3ee 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.btn {
  background: var(--gradient-primary);
  color: var(--text-on-accent);
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition-bounce);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
  color: var(--text-on-accent);
}

.btn:active {
  transform: translateY(-1px) scale(0.98);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-500);
  color: var(--primary-600);
  box-shadow: none;
}

[data-theme="dark"] .btn-outline {
  color: var(--primary-300);
  border-color: var(--primary-400);
}

.btn-outline:hover {
  background: var(--primary-50);
  color: var(--primary-700);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .btn-outline:hover {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-200);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
}

.hero-note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-note .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
  display: inline-block;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.7; }
}

.hero-visual {
  position: relative;
  animation: fadeInRight 0.8s ease-out 0.3s both;
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero-svg {
  background: var(--bg-glass-strong);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.hero-svg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), transparent 50%, rgba(217, 70, 239, 0.1));
  pointer-events: none;
  z-index: 1;
}

.hero-svg:hover {
  transform: translateY(-5px) rotate(1deg);
  box-shadow: var(--shadow-glow);
}

.hero-svg svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-xl);
}

.hero-badge {
  position: absolute;
  top: -12px;
  right: -12px;
  background: var(--gradient-primary);
  color: white;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
  z-index: 2;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ===== 通用区块标题 ===== */
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  margin: 3rem 0 2rem;
  padding-bottom: 0.75rem;
  position: relative;
  display: inline-block;
  color: var(--text-heading);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.section-title .icon {
  display: inline-block;
  margin-right: 0.5rem;
  font-size: 1.2em;
  vertical-align: middle;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
  max-width: 700px;
}

/* ===== 卡片通用样式 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-bounce);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: white;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  transition: var(--transition-bounce);
}

.card:hover .card-icon {
  transform: rotate(-5deg) scale(1.1);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  font-weight: 600;
  color: var(--primary-600);
  transition: gap 0.3s ease;
}

.card .card-link:hover {
  gap: 0.75rem;
  color: var(--primary-700);
}

/* 卡片悬停时内容上移效果 */
.card-hover-lift {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ===== 文章卡片 ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.75rem;
  margin: 2rem 0;
}

.article-item {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  border: 1px solid var(--border-light);
  transition: var(--transition-bounce);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.article-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.article-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.article-item:hover::after {
  transform: scaleX(1);
}

.article-item time {
  color: var(--text-tertiary);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.article-item time::before {
  content: '📅';
  font-size: 0.9em;
}

.article-item h3 {
  margin: 0.75rem 0 0.75rem;
  font-size: 1.15rem;
  line-height: 1.5;
  font-weight: 700;
  transition: color 0.3s ease;
}

.article-item:hover h3 {
  color: var(--primary-600);
}

.article-item p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.article-item .read-more {
  color: var(--primary-600);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap 0.3s ease;
}

.article-item .read-more:hover {
  gap: 0.75rem;
  color: var(--primary-700);
}

.article-item .read-more::after {
  content: '→';
  transition: transform 0.3s ease;
}

.article-item .read-more:hover::after {
  transform: translateX(4px);
}

/* 文章标签 */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag {
  background: var(--bg-soft);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-tertiary);
  border: 1px solid var(--border-light);
  transition: var(--transition-base);
}

.tag:hover {
  background: var(--primary-50);
  border-color: var(--primary-300);
  color: var(--primary-700);
}

/* ===== FAQ 样式 ===== */
.faq-list {
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.faq-item:hover {
  border-color: var(--primary-300);
  box-shadow: var(--shadow-md);
}

.faq-item.active {
  border-color: var(--primary-400);
  box-shadow: var(--shadow-glow);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-heading);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 1rem;
  transition: var(--transition-base);
  gap: 1rem;
}

.faq-question:hover {
  background: var(--bg-soft);
}

.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  min-width: 24px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition-base);
  border: 1px solid var(--border-light);
  color: var(--text-tertiary);
}

.faq-item.active .faq-icon {
  background: var(--gradient-primary);
  color: white;
  transform: rotate(45deg);
  border-color: transparent;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  margin-top: 0.25rem;
  line-height: 1.8;
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== HowTo 样式 ===== */
.howto-box {
  background: var(--bg-card);
  padding: 2.5rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: var(--transition-base);
}

.howto-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.howto-box:hover {
  box-shadow: var(--shadow-xl);
}

.howto-box h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-heading);
}

.howto-box ol {
  padding-left: 1.5rem;
  color: var(--text-secondary);
  counter-reset: custom-counter;
  list-style: none;
}

.howto-box li {
  margin: 1rem 0;
  position: relative;
  padding-left: 1rem;
  line-height: 1.8;
}

.howto-box li::before {
  counter-increment: custom-counter;
  content: counter(custom-counter);
  position: absolute;
  left: -1.5rem;
  top: 0.35rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.howto-box strong {
  color: var(--text-heading);
}

.howto-summary {
  margin-top: 1.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-soft);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--primary-500);
  color: var(--text-heading);
  font-weight: 500;
}

/* ===== 联系我们 ===== */
.contact-section {
  margin: 3rem 0;
}

/* ===== Footer 样式 ===== */
footer {
  background: var(--neutral-900);
  color: var(--neutral-300);
  margin-top: 5rem;
  padding: 4rem 0 2rem;
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] footer {
  background: #020617;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-500), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2rem;
  padding-bottom: 2rem;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 1rem;
}

.footer-brand .logo span {
  background: linear-gradient(135deg, #a78bfa, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.footer-brand p {
  color: var(--neutral-400);
  line-height: 1.7;
  font-size: 0.95rem;
}

footer h4 {
  color: white;
  margin-bottom: 1.25rem;
  font-size: 1.1rem;
  font-weight: 600;
  position: relative;
  padding-bottom: 0.5rem;
}

footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary-500);
  border-radius: var(--radius-full);
}

footer ul {
  list-style: none;
  padding: 0;
}

footer ul li {
  margin-bottom: 0.5rem;
}

footer a {
  color: var(--neutral-400);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-base);
  font-size: 0.95rem;
}

footer a:hover {
  color: white;
  transform: translateX(4px);
}

footer a::before {
  content: '›';
  color: var(--primary-500);
  font-weight: 700;
  font-size: 1.1rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

footer a:hover::before {
  opacity: 1;
}

.copyright {
  text-align: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--neutral-500);
  font-size: 0.9rem;
}

.copyright a {
  color: var(--neutral-400);
}

.copyright a:hover {
  color: var(--primary-400);
}

/* 页脚社交图标 */
.social-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-300);
  transition: var(--transition-bounce);
  font-size: 1.2rem;
}

.social-links a:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-3px) scale(1.1);
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.25rem;
  cursor: pointer;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.back-to-top:active {
  transform: translateY(0) scale(0.95);
}

/* ===== 链接组 ===== */
.link-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.link-group a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  transition: var(--transition-base);
}

.link-group a:hover {
  background: var(--primary-50);
  border-color: var(--primary-300);
  color: var(--primary-700);
  transform: translateY(-2px);
}

.link-group .separator {
  color: var(--border-medium);
  display: inline-flex;
  align-items: center;
}

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

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* 滚动进入动画 */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* 视差效果 */
.parallax {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* ===== 工具类 ===== */
.text-center {
  text-align: center;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.bg-soft {
  background: var(--bg-soft);
}

.bg-card {
  background: var(--bg-card);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }
.p-5 { padding: 3rem; }

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .hero .lead {
    margin-left: auto;
    margin-right: auto;
  }
  
  .btn-group {
    justify-content: center;
  }
  
  .hero-note {
    justify-content: center;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    gap: 1rem;
    animation: fadeInDown 0.3s ease;
  }
  
  .nav-links.show {
    display: flex;
  }
  
  .nav-links li {
    margin: 0;
  }
  
  .nav-links a {
    display: block;
    padding: 0.75rem 0;
    font-size: 1.1rem;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-cta {
    gap: 0.5rem;
  }
  
  .theme-toggle {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
  }
  
  .theme-toggle .label {
    display: none;
  }
  
  .hero {
    padding: 3rem 0 4rem;
  }
  
  .article-list {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }
  
  .container {
    padding: 0 16px;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero .lead {
    font-size: 1.1rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .footer-brand {
    max-width: 100%;
  }
  
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }
  
  .howto-box {
    padding: 1.5rem;
  }
  
  .howto-box ol {
    padding-left: 0.5rem;
  }
  
  .howto-box li {
    padding-left: 0.5rem;
  }
  
  .howto-box li::before {
    left: -0.5rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero .lead {
    font-size: 1rem;
  }
  
  .btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.95rem;
  }
  
  .btn-group {
    gap: 0.5rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .article-item {
    padding: 1.25rem;
  }
  
  .logo {
    font-size: 1.4rem;
  }
  
  .theme-toggle {
    padding: 0.35rem 0.6rem;
  }
  
  .theme-toggle .icon {
    font-size: 1rem;
  }
  
  .link-group {
    gap: 0.5rem;
    padding: 1rem;
  }
  
  .link-group a {
    font-size: 0.85rem;
    padding: 0.3rem 0.75rem;
  }
}

/* 打印样式 */
@media print {
  .navbar,
  .back-to-top,
  .mobile-menu-btn,
  .theme-toggle,
  .btn-group,
  .hero-note {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
  
  .card,
  .article-item,
  .faq-item,
  .howto-box {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
  
  .hero {
    padding: 1rem 0;
  }
  
  footer {
    background: white;
    color: black;
    border-top: 2px solid #333;
  }
  
  footer h4 {
    color: black;
  }
  
  footer a {
    color: #333;
  }
}

/* 无障碍辅助 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--primary-400);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 玻璃拟态工具类 */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border-light);
}

.glass-strong {
  background: var(--bg-glass-strong);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border: 1px solid var(--border-light);
}

/* 渐变边框 */
.gradient-border {
  position: relative;
  background: var(--bg-card);
  background-clip: padding-box;
  border: 1px solid transparent;
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: var(--gradient-primary);
  z-index: -1;
}

/* 悬停光晕效果 */
.hover-glow {
  transition: var(--transition-base);
}

.hover-glow:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* 文本截断 */
.text-truncate {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 骨架屏动画 */
.skeleton {
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--bg-card) 50%, var(--bg-soft) 75%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite linear;
  border-radius: var(--radius-md);
}
```