```css
/* ============================================
   天天影院 - 完整样式表 (style.css)
   设计风格：现代影视平台 / 深色优先 / 毛玻璃 + 渐变
   版本：1.0
   ============================================ */

/* ---------- 设计令牌 & 主题变量 ---------- */
:root {
  /* 品牌色系 */
  --brand-primary: #6d28d9;
  --brand-secondary: #4f46e5;
  --brand-accent: #8b5cf6;
  --brand-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
  --brand-glow: rgba(139, 92, 246, 0.4);

  /* 功能色 */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* 浅色主题（默认，但实际网站以深色为主） */
  --bg-body: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-elevated: #f8fafc;
  --bg-overlay: rgba(255, 255, 255, 0.75);
  --bg-nav: rgba(255, 255, 255, 0.72);
  --bg-footer: #1e293b;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-invert: #f8fafc;
  --text-link: #4f46e5;
  --text-link-hover: #4338ca;

  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px var(--brand-glow);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Inter", "PingFang SC", var(--font-sans);

  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色主题覆盖（默认强制深色，因为影视站深色体验最佳） */
body.dark,
body:not(.dark) {
  --bg-body: #09090f;
  --bg-surface: #13111c;
  --bg-elevated: #1c1a2b;
  --bg-overlay: rgba(20, 18, 32, 0.85);
  --bg-nav: rgba(12, 10, 22, 0.72);
  --bg-footer: #0b0a12;

  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-invert: #0f172a;
  --text-link: #a78bfa;
  --text-link-hover: #c4b5fd;

  --border-color: rgba(148, 163, 184, 0.15);
  --border-strong: rgba(148, 163, 184, 0.3);
}

/* 强制深色模式（用户未设置时也使用深色） */
body {
  --bg-body: #09090f;
  --bg-surface: #13111c;
  --bg-elevated: #1c1a2b;
  --bg-overlay: rgba(20, 18, 32, 0.85);
  --bg-nav: rgba(12, 10, 22, 0.72);
  --bg-footer: #0b0a12;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-invert: #0f172a;
  --text-link: #a78bfa;
  --text-link-hover: #c4b5fd;
  --border-color: rgba(148, 163, 184, 0.15);
  --border-strong: rgba(148, 163, 184, 0.3);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px; /* 为吸顶导航预留空间 */
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
  transition: background-color 0.4s ease, color 0.4s ease;
  background-image: radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                    radial-gradient(ellipse at 80% 10%, rgba(168, 85, 247, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 0.5em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin-top: 2.5rem;
  margin-bottom: 1.2rem;
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 1.4em;
  background: var(--brand-gradient);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--text-link-hover);
  border-bottom-color: currentColor;
}

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

ul, ol {
  padding-left: 1.2rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.4rem;
}

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--brand-gradient);
  color: #fff;
  padding: 0.65rem 1.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
  border: 1px solid transparent;
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--text-link);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}

.btn-outline:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--text-link);
  color: var(--text-link);
  transform: translateY(-2px);
  box-shadow: none;
}

.btn-sm {
  padding: 0.4rem 1.1rem;
  font-size: 0.85rem;
}

/* 徽章 */
.badge {
  display: inline-block;
  padding: 0.2rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(99, 102, 241, 0.2));
  color: var(--text-link);
  border: 1px solid rgba(139, 92, 246, 0.3);
  backdrop-filter: blur(4px);
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.logo a {
  font-size: 1.7rem;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  border: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.logo span {
  background: none;
  -webkit-text-fill-color: initial;
  color: var(--text-primary);
  font-weight: 300;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: none;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.1);
}

.nav-links a.active {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.15);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  line-height: 1;
}

.icon-btn:hover {
  background: rgba(139, 92, 246, 0.1);
  color: var(--text-link);
  transform: rotate(8deg);
}

/* 移动端导航 */
.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 0.5rem 1rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
}

.mobile-nav a {
  padding: 0.8rem 0.5rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  background: rgba(139, 92, 246, 0.08);
}

/* 移动端汉堡按钮 */
.mobile-menu {
  display: none;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .mobile-menu {
    display: block;
  }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 1.2rem 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.breadcrumb span {
  color: var(--text-secondary);
}

.breadcrumb .separator {
  margin: 0 0.3rem;
  opacity: 0.6;
}

/* ---------- Hero 区域 ---------- */
.hero {
  position: relative;
  padding: 3.5rem 0 4rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 120%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 600px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 1.1rem;
  background: var(--brand-gradient);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
  letter-spacing: 0.02em;
}

.hero h1 {
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-link) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.hero .lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
}

.hero-visual svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(139, 92, 246, 0.1);
  background: linear-gradient(145deg, rgba(139, 92, 246, 0.1), transparent);
}

/* Hero 浮动装饰 */
.hero-visual::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: var(--radius-xl);
  background: var(--brand-gradient);
  opacity: 0.08;
  filter: blur(30px);
  z-index: -1;
}

@media (max-width: 900px) {
  .hero {
    padding: 2.5rem 0 3rem;
  }
  .hero .container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  .hero-cta {
    justify-content: center;
  }
  .hero-visual {
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
  }
}

/* ---------- 区块通用 ---------- */
.section {
  padding: 2rem 0 3rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-header h2 {
  margin: 0;
}

.view-all {
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border-strong);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.view-all:hover {
  border-color: var(--text-link);
  color: var(--text-link);
  transform: translateX(4px);
}

/* ---------- 卡片系统 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.8rem 1.5rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--brand-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(139, 92, 246, 0.1);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card .card-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  display: inline-block;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card .meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card .meta::before {
  content: "•";
  opacity: 0.5;
}

.card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1rem;
  font-weight: 500;
  font-size: 0.9rem;
  border: none;
}

.card .card-link:hover {
  color: var(--text-link);
  gap: 0.6rem;
}

/* ---------- 文章列表 ---------- */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 2rem 0;
}

.article-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.8rem;
  transition: all var(--transition-base);
  position: relative;
  border-left: 4px solid transparent;
}

.article-item:hover {
  border-left-color: var(--brand-accent);
  background: var(--bg-elevated);
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

.article-item h3 {
  margin-bottom: 0.3rem;
  font-size: 1.15rem;
}

.article-item h3 a {
  border: none;
}

.article-item .date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-item .excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.article-item .read-more {
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.article-item .read-more:hover {
  gap: 0.5rem;
}

/* 文章标签 */
.tag {
  display: inline-block;
  background: rgba(139, 92, 246, 0.1);
  color: var(--text-link);
  padding: 0.15rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  margin-right: 0.3rem;
}

/* ---------- FAQ 样式 ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 2rem 0;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(139, 92, 246, 0.3);
}

.faq-question {
  padding: 1.1rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
  font-size: 1rem;
  user-select: none;
  gap: 1rem;
  transition: background 0.2s;
}

.faq-question:hover {
  background: rgba(139, 92, 246, 0.05);
}

.faq-question .faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(139, 92, 246, 0.1);
  transition: transform var(--transition-base);
  font-weight: 400;
}

.faq-item.open .faq-question .faq-icon {
  transform: rotate(45deg);
  background: var(--brand-gradient);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  padding: 0 1.5rem;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.2rem;
}

/* ---------- HowTo 步骤 ---------- */
.howto-container {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.howto-container::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 100%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.08), transparent);
  pointer-events: none;
}

.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
  position: relative;
  z-index: 1;
}

.howto-step {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.howto-step:hover {
  transform: translateY(-4px);
  border-color: var(--brand-accent);
  box-shadow: var(--shadow-md);
}

.howto-step .step-number {
  width: 40px;
  height: 40px;
  background: var(--brand-gradient);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 1rem;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px rgba(139, 92, 246, 0.3);
}

.howto-step h4 {
  margin-bottom: 0.3rem;
  color: var(--text-primary);
  text-transform: none;
  font-size: 1rem;
}

.howto-step p {
  font-size: 0.9rem;
  margin: 0;
}

.howto-tips {
  background: rgba(139, 92, 246, 0.06);
  border-left: 4px solid var(--brand-accent);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 1.5rem;
}

.howto-tips ul {
  margin: 0.5rem 0 0;
}

/* ---------- 表格 ---------- */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-surface);
  font-size: 0.95rem;
}

thead {
  background: var(--bg-elevated);
}

th {
  padding: 1rem 1.2rem;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--brand-accent);
  white-space: nowrap;
}

td {
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: rgba(139, 92, 246, 0.03);
}

/* ---------- 联系/信息区块 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.contact-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  text-align: center;
  transition: all var(--transition-base);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-accent);
}

.contact-card .contact-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.contact-card h4 {
  text-transform: none;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.contact-card p {
  font-size: 0.95rem;
  margin: 0;
  word-break: break-all;
}

/* ---------- 页脚 ---------- */
footer {
  background: var(--bg-footer);
  color: var(--text-secondary);
  padding: 3.5rem 0 1.5rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  position: relative;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--brand-gradient);
  opacity: 0.6;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-col h4 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0;
}

.footer-col p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

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

.footer-col ul a {
  color: var(--text-muted);
  font-size: 0.9rem;
  border: none;
  transition: all var(--transition-fast);
}

.footer-col ul a:hover {
  color: var(--text-link);
  padding-left: 4px;
}

.footer-social {
  display: flex;
  gap: 0.8rem;
  margin-top: 1rem;
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  font-size: 1rem;
  color: var(--text-muted);
}

.footer-social a:hover {
  background: var(--brand-gradient);
  color: #fff;
  transform: translateY(-3px);
  border-color: transparent;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-muted);
  border: none;
}

.footer-bottom .legal-links {
  display: flex;
  gap: 1.5rem;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 1.8rem;
  bottom: 1.8rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: #fff;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.5);
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* 浮动装饰 */
.float-animation {
  animation: float 4s ease-in-out infinite;
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.text-gradient {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.py-2 { padding: 2rem 0; }
.py-3 { padding: 3rem 0; }
.hidden { display: none; }

/* 玻璃拟态 */
.glass {
  background: var(--bg-overlay);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
}

/* ---------- 响应式细节 ---------- */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  h1 {
    font-size: 2rem;
  }
  .hero .lead {
    font-size: 1rem;
  }
  .card-grid {
    gap: 1.2rem;
  }
  .article-item {
    padding: 1.2rem;
  }
  .howto-container {
    padding: 1.5rem;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .back-to-top {
    right: 1rem;
    bottom: 1rem;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  h2 {
    font-size: 1.5rem;
  }
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }
  .btn {
    width: 100%;
    text-align: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

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

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand-primary), var(--brand-secondary));
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-accent);
}

/* 焦点可见性 */
:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

/* 选择文本 */
::selection {
  background: var(--brand-accent);
  color: #fff;
}
```