```css
/* ===== 天天影院 全站样式 ===== */
/* 主题：深海蓝 × 琥珀金 · 科技影音风 */
/* 核心规范：文字高对比度，清晰层级，无低可见度 */

/* ===== 基础重置与字体 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  background: #f1f5f9;
  color: #1e293b;
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.3s ease;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  background: none;
}

input,
textarea {
  font-family: inherit;
  outline: none;
}

/* ===== 文字颜色体系（浅色模式） ===== */
body,
p,
li,
.article-card p,
.faq-a,
.step-desc,
.solution-card p,
.team-bio,
.case-text,
.news-item p,
.howto-desc {
  color: #1e293b;
}

h1,
h2,
h3,
h4,
h5,
h6,
.nav-links a,
.footer a,
.btn,
.highlight,
.stat-number,
.brand-name,
.section-title,
.article-title,
.faq-q,
.step-title {
  color: #0f172a;
}

.meta,
.date,
.author,
.read-more,
.tag,
.small-text,
.footer-bottom p {
  color: #475569;
}

/* ===== 暗色模式 ===== */
@media (prefers-color-scheme: dark) {
  body {
    background: #0b1120;
    color: #e2e8f0;
  }

  body,
  p,
  li,
  .article-card p,
  .faq-a,
  .step-desc,
  .solution-card p,
  .team-bio,
  .case-text,
  .news-item p,
  .howto-desc {
    color: #e2e8f0;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6,
  .nav-links a,
  .btn,
  .highlight,
  .stat-number,
  .brand-name,
  .section-title,
  .article-title,
  .faq-q,
  .step-title {
    color: #f8fafc;
  }

  .meta,
  .date,
  .author,
  .read-more,
  .tag,
  .small-text,
  .footer-bottom p {
    color: #94a3b8;
  }

  .footer a {
    color: #cbd5e1;
  }

  .footer a:hover {
    color: #fbbf24;
  }
}

/* ===== 布局容器 ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== 导航栏 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
  transition: all 0.3s ease;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.logo svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
  transition: transform 0.3s ease;
}

.logo:hover svg {
  transform: rotate(-8deg) scale(1.05);
}

.brand-name {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 6px 2px;
  transition: color 0.2s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

.nav-links a:hover {
  color: #b45309;
}

.nav-cta {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* 搜索栏 */
.search-bar {
  display: flex;
  align-items: center;
  background: rgba(241, 245, 249, 0.8);
  border-radius: 40px;
  padding: 4px 4px 4px 16px;
  border: 1px solid rgba(203, 213, 225, 0.5);
  transition: all 0.3s ease;
  width: 200px;
}

.search-bar:focus-within {
  border-color: #f59e0b;
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
  background: white;
}

.search-bar input {
  border: none;
  flex: 1;
  padding: 8px 4px;
  background: transparent;
  color: #1e293b;
  font-size: 0.9rem;
  width: 100%;
}

.search-bar input::placeholder {
  color: #94a3b8;
}

.search-bar button {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
  border: none;
  border-radius: 40px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
}

.search-bar button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* 汉堡按钮 */
.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: #1e293b;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.hamburger:hover {
  background: rgba(241, 245, 249, 0.8);
}

/* 移动菜单 */
#mobileMenu {
  display: none;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  padding: 1.2rem 1.5rem;
  border-top: 1px solid rgba(226, 232, 240, 0.5);
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.05);
  border-radius: 0 0 20px 20px;
}

#mobileMenu a {
  display: block;
  margin: 0.5rem 0;
  padding: 10px 16px;
  border-radius: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
}

#mobileMenu a:hover {
  background: rgba(245, 158, 11, 0.1);
  color: #b45309;
}

/* 暗色模式导航 */
@media (prefers-color-scheme: dark) {
  .nav {
    background: rgba(15, 23, 42, 0.85);
    border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  }

  .nav-links a {
    color: #f1f5f9;
  }

  .nav-links a:hover {
    color: #fbbf24;
  }

  .hamburger {
    color: #e2e8f0;
  }

  .hamburger:hover {
    background: rgba(51, 65, 85, 0.5);
  }

  .search-bar {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(51, 65, 85, 0.6);
  }

  .search-bar input {
    color: #e2e8f0;
  }

  .search-bar input::placeholder {
    color: #64748b;
  }

  #mobileMenu {
    background: rgba(15, 23, 42, 0.98);
    border-top: 1px solid rgba(51, 65, 85, 0.5);
  }

  #mobileMenu a:hover {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
  }
}

/* ===== 按钮 ===== */
.btn {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #0f172a;
  font-weight: 700;
  border: none;
  padding: 0.85rem 2.2rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 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, 0.3), transparent);
  transition: left 0.5s ease;
}

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

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

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

.btn-outline {
  background: transparent;
  border: 2px solid #1e293b;
  color: #1e293b;
  box-shadow: none;
}

.btn-outline:hover {
  background: #1e293b;
  color: white;
  box-shadow: 0 4px 15px rgba(30, 41, 59, 0.2);
}

/* 暗色按钮 */
@media (prefers-color-scheme: dark) {
  .btn {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #0f172a;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.2);
  }

  .btn:hover {
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
  }

  .btn-outline {
    border-color: #94a3b8;
    color: #e2e8f0;
  }

  .btn-outline:hover {
    background: #94a3b8;
    color: #0f172a;
  }
}

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(145deg, #eef2f7 0%, #e2e8f0 50%, #d1d5db 100%);
  padding: 5rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, #0f172a 30%, #334155);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.15rem;
  margin: 1rem 0 2rem;
  opacity: 0.85;
  max-width: 540px;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  padding: 1rem 1.5rem;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-item > div:last-child {
  font-size: 0.9rem;
  font-weight: 500;
}

.hero-image {
  position: relative;
}

.hero-image svg {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  transform: perspective(1000px) rotateY(-5deg);
  transition: transform 0.5s ease;
}

.hero-image:hover svg {
  transform: perspective(1000px) rotateY(0deg);
}

/* Hero 动态背景装饰 */
.hero-image::before {
  content: "";
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
  height: 100px;
  border-radius: 20px;
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  opacity: 0.3;
  filter: blur(30px);
  z-index: -1;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* 暗色 Hero */
@media (prefers-color-scheme: dark) {
  .hero {
    background: linear-gradient(145deg, #0f172a 0%, #1e293b 60%, #334155 100%);
  }

  .hero::before {
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
  }

  .hero::after {
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
  }

  .hero h1 {
    background: linear-gradient(135deg, #f8fafc 30%, #cbd5e1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero p {
    color: #cbd5e1;
    opacity: 0.9;
  }

  .stat-item {
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(51, 65, 85, 0.5);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  }

  .stat-number {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

/* ===== 通用 Section 样式 ===== */
.section {
  padding: 5rem 0;
  position: relative;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 1rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
  border-radius: 4px;
}

.section-subtitle {
  font-size: 1.15rem;
  margin-bottom: 2.5rem;
  opacity: 0.8;
  max-width: 700px;
}

/* ===== 卡片通用 ===== */
.card,
.article-card,
.faq-item,
.solution-card,
.case-card,
.news-item,
.team-card,
.howto-card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(226, 232, 240, 0.6);
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card:hover,
.article-card:hover,
.solution-card:hover,
.howto-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
  border-color: rgba(245, 158, 11, 0.2);
}

/* 暗色卡片 */
@media (prefers-color-scheme: dark) {
  .card,
  .article-card,
  .faq-item,
  .solution-card,
  .case-card,
  .news-item,
  .team-card,
  .howto-card {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(51, 65, 85, 0.5);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  }

  .card:hover,
  .article-card:hover,
  .solution-card:hover,
  .howto-card:hover {
    border-color: rgba(245, 158, 11, 0.3);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  }
}

/* ===== 网格布局 ===== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* ===== FAQ 样式 ===== */
.faq-item {
  padding: 1.5rem 1.8rem;
  margin-bottom: 1rem;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
}

.faq-q {
  font-weight: 600;
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  user-select: none;
}

.faq-q span {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: #f59e0b;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.1);
}

.faq-item.active .faq-q span {
  transform: rotate(45deg);
}

.faq-a {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(226, 232, 240, 0.4);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* 暗色 FAQ */
@media (prefers-color-scheme: dark) {
  .faq-item:hover {
    border-color: rgba(245, 158, 11, 0.3);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  }

  .faq-a {
    border-top-color: rgba(51, 65, 85, 0.5);
  }
}

/* ===== 文章卡片 ===== */
.article-card {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.article-card:hover h3 {
  color: #b45309;
}

.meta {
  display: flex;
  gap: 1.2rem;
  font-size: 0.85rem;
  opacity: 0.8;
  flex-wrap: wrap;
}

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

.meta span::before {
  content: "•";
  color: #f59e0b;
}

.meta span:first-child::before {
  content: "";
}

.read-more {
  margin-top: auto;
  color: #b45309;
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.read-more:hover {
  gap: 10px;
  color: #0f172a;
}

/* ===== 步骤卡片 ===== */
.howto-card {
  padding: 2.5rem;
}

.step {
  display: flex;
  gap: 1.2rem;
  margin-bottom: 1.8rem;
  padding: 1rem;
  border-radius: 12px;
  transition: background 0.3s ease;
}

.step:hover {
  background: rgba(245, 158, 11, 0.05);
}

.step-num {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #0f172a;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.step h4 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.step-desc {
  font-size: 0.95rem;
  opacity: 0.8;
}

/* ===== 表格 ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  overflow: hidden;
}

th,
td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  font-size: 0.95rem;
}

th {
  background: linear-gradient(135deg, #f8fafc, #f1f5f9);
  font-weight: 700;
  color: #0f172a;
}

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

tr:hover td {
  background: rgba(245, 158, 11, 0.03);
}

/* 暗色表格 */
@media (prefers-color-scheme: dark) {
  table {
    background: rgba(30, 41, 59, 0.8);
  }

  th {
    background: rgba(51, 65, 85, 0.5);
    color: #f8fafc;
  }

  th,
  td {
    border-bottom-color: rgba(51, 65, 85, 0.5);
    color: #e2e8f0;
  }

  tr:hover td {
    background: rgba(245, 158, 11, 0.05);
  }
}

/* ===== 徽章 ===== */
.badge {
  background: linear-gradient(135deg, #fde68a, #fbbf24);
  color: #0f172a;
  padding: 0.4rem 1rem;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===== 品牌 Logo 卡片 ===== */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.brand-logo svg {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.2);
}

/* ===== 特性列表 ===== */
.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  padding: 0.6rem 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
}

.feature-list li::before {
  content: "✓";
  color: #f59e0b;
  font-weight: 800;
  font-size: 1.2rem;
}

/* ===== 轮播指示点 ===== */
.banner-dots {
  text-align: center;
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.dot {
  width: 10px;
  height: 10px;
  background: #cbd5e1;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  padding: 0;
}

.dot.active {
  background: #f59e0b;
  width: 30px;
  border-radius: 10px;
}

.dot:hover {
  background: #f59e0b;
  transform: scale(1.2);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  z-index: 100;
  border: none;
}

.back-to-top:hover {
  background: #f59e0b;
  color: #0f172a;
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.4);
}

/* ===== Footer 样式 ===== */
.footer {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  padding: 4rem 0 0;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #f59e0b, transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
}

.footer h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: #f8fafc;
  position: relative;
}

.footer h4::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 30px;
  height: 2px;
  background: #f59e0b;
  border-radius: 2px;
}

.footer p {
  color: #94a3b8;
  line-height: 1.8;
  font-size: 0.95rem;
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: 0.6rem;
}

.footer a {
  color: #94a3b8;
  transition: all 0.2s ease;
  font-size: 0.95rem;
}

.footer a:hover {
  color: #f59e0b;
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(51, 65, 85, 0.5);
  padding: 1.5rem 0;
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
}

.footer-bottom p {
  margin: 0.3rem 0;
  font-size: 0.85rem;
  color: #64748b;
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .nav .container {
    height: 64px;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .search-bar {
    width: 120px;
  }

  .search-bar button {
    padding: 8px;
    width: 32px;
    height: 32px;
  }

  .hero {
    padding: 3rem 0 2rem;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-stats {
    justify-content: center;
    gap: 1rem;
  }

  .stat-item {
    padding: 0.8rem 1.2rem;
    font-size: 0.85rem;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .hero-image {
    order: -1;
  }

  .hero-image svg {
    max-width: 350px;
    margin: 0 auto;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .section {
    padding: 3rem 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-bottom: 2rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }

  .howto-card {
    padding: 1.5rem;
  }

  .step {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
    padding: 0.8rem;
  }

  .faq-item {
    padding: 1.2rem;
  }
}

@media (max-width: 480px) {
  .search-bar {
    display: none;
  }

  .nav-cta {
    gap: 0.5rem;
  }

  .btn {
    padding: 0.75rem 1.6rem;
    font-size: 0.9rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .stat-item {
    font-size: 0.8rem;
    padding: 0.6rem 0.9rem;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .article-card {
    padding: 1.2rem;
  }

  .container {
    padding: 0 16px;
  }

  .footer-grid {
    gap: 1.2rem;
  }
}

/* ===== 无障碍与交互细节 ===== */
:focus-visible {
  outline: 3px solid rgba(245, 158, 11, 0.5);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: rgba(245, 158, 11, 0.3);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #94a3b8, #64748b);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #f59e0b, #d97706);
  background-clip: content-box;
}

/* 暗色滚动条 */
@media (prefers-color-scheme: dark) {
  ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #475569, #334155);
    background-clip: content-box;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #f59e0b, #b45309);
    background-clip: content-box;
  }
}

/* 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;
  }
}

/* ===== 其他优化 ===== */
.text-center {
  text-align: center;
}

.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: 2.5rem; }

.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: 2.5rem; }

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.icon-text {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

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

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

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}
```