/* ============================================
   海角 - 海角千万资源免费观看 Haijiao
   品牌主题样式表 | wuantv.cn
   原创设计：深海青 + 珊瑚橙 双色体系
   ============================================ */

/* ===== CSS 变量 / 设计令牌 ===== */
:root {
  --color-primary: #0d5c63;
  --color-primary-dark: #094248;
  --color-primary-light: #1a7a82;
  --color-secondary: #ff6b4a;
  --color-secondary-dark: #e55a3a;
  --color-secondary-light: #ff8a6e;
  --color-accent: #f4e4c1;
  --color-dark: #1a2a2e;
  --color-text: #2d3436;
  --color-text-light: #636e72;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-dark: #0a1518;
  --color-border: #e1e8ed;
  --color-white: #ffffff;
  --color-success: #00b894;
  --color-warning: #fdcb6e;
  --shadow-sm: 0 2px 8px rgba(13, 92, 99, 0.08);
  --shadow-md: 0 4px 20px rgba(13, 92, 99, 0.12);
  --shadow-lg: 0 8px 40px rgba(13, 92, 99, 0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
  --max-width: 1280px;
  --nav-height: 64px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-secondary);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-dark);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.9rem; }

/* ===== 通用容器 ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 60px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-white);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
  color: var(--color-white);
}

.text-center { text-align: center; }
.text-secondary { color: var(--color-secondary); }
.text-primary { color: var(--color-primary); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background: var(--color-secondary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ===== 头部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.header-top {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 6px 0;
  font-size: 0.8rem;
  text-align: center;
}

.header-top a {
  color: var(--color-accent);
}

.nav-wrap {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.nav-logo .brand-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.nav-logo .brand-sub {
  font-size: 0.7rem;
  color: var(--color-text-light);
  display: block;
  line-height: 1;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-menu a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--color-primary);
  color: var(--color-white);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-actions .btn {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* ===== 搜索框 ===== */
.search-bar {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}

.search-form {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
  gap: 8px;
}

.search-input {
  flex: 1;
  padding: 10px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--color-primary);
}

.search-btn {
  padding: 10px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.search-btn:hover {
  background: var(--color-primary-dark);
}

/* ===== 移动端菜单按钮 ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 0;
  color: var(--color-white);
}

.hero-content h1 {
  color: var(--color-white);
  font-size: 2.4rem;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-content h1 .highlight {
  color: var(--color-secondary);
}

.hero-content p {
  font-size: 1.1rem;
  margin-bottom: 24px;
  max-width: 600px;
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-secondary);
  display: block;
}

.hero-stat .label {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ===== 区块标题 ===== */
.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 1.8rem;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.section-title h2 .accent {
  color: var(--color-secondary);
}

.section-title p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.section-title.left {
  text-align: left;
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-dark);
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.08);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(255, 107, 74, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 20px solid var(--color-white);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.75);
  color: var(--color-white);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-dark);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

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

.video-tag {
  display: inline-block;
  padding: 2px 10px;
  background: rgba(13, 92, 99, 0.1);
  color: var(--color-primary);
  font-size: 0.75rem;
  border-radius: 20px;
  margin-right: 6px;
  margin-bottom: 4px;
}

/* ===== 功能模块网格 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

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

.feature-card .icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.feature-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.feature-card .tag {
  padding: 3px 10px;
  background: var(--color-bg-alt);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* ===== 图文模块 ===== */
.content-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.content-row.reverse {
  direction: rtl;
}

.content-row.reverse > * {
  direction: ltr;
}

.content-row img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.content-row h2 {
  margin-bottom: 16px;
}

.content-row p {
  margin-bottom: 14px;
  color: var(--color-text-light);
}

.content-row .btn {
  margin-top: 8px;
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.expert-photo {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.expert-info {
  padding: 20px;
}

.expert-info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.expert-info .role {
  color: var(--color-secondary);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.expert-info .bio {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.expert-info .awards {
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.expert-actions {
  display: flex;
  gap: 8px;
}

.expert-actions .btn {
  padding: 6px 14px;
  font-size: 0.8rem;
}

/* ===== 合作Logo墙 ===== */
.partner-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  align-items: center;
}

.partner-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}

.partner-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.partner-item .partner-logo {
  width: 60px;
  height: 60px;
  margin: 0 auto 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 1.2rem;
  font-weight: 700;
}

.partner-item .partner-name {
  font-size: 0.85rem;
  color: var(--color-text);
}

/* ===== FAQ 手风琴 ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--color-primary);
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
  color: var(--color-dark);
}

.faq-question .toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.2rem;
  transition: var(--transition);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 24px 18px;
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ===== 用户评论 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-sm);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.review-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.review-date {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.review-stars {
  color: var(--color-secondary);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.review-text {
  font-size: 0.88rem;
  color: var(--color-text);
  line-height: 1.6;
}

/* ===== 联系信息 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-info-item .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info-item .label {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 2px;
}

.contact-info-item .value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
}

.qr-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.qr-item .label {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ===== 社交分享 ===== */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-white);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.share-btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #000000; }
.share-bilibili { background: #fb7299; }
.share-copy { background: var(--color-primary); }

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

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

.breadcrumb span {
  margin: 0 8px;
}

/* ===== 内页通用 ===== */
.page-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  padding: 50px 0;
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
  font-size: 2rem;
  margin-bottom: 10px;
}

.page-header p {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto;
}

.page-content {
  padding: 50px 0;
}

.intro-block {
  max-width: 800px;
  margin: 0 auto 40px;
  text-align: center;
}

.intro-block p {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

/* ===== 标签云 ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 20px 0;
}

.tag-cloud a {
  padding: 6px 16px;
  background: var(--color-bg-alt);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-text);
  transition: var(--transition);
}

.tag-cloud a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ===== How-To 步骤 ===== */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.step-card {
  text-align: center;
  padding: 28px 20px;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--color-secondary);
}

.step-num {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: var(--color-secondary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
}

.step-card h4 {
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 50px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 30px;
}

.footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand .logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.footer-brand .logo .name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-secondary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
  margin-bottom: 6px;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-update {
  color: var(--color-secondary);
  font-weight: 600;
}

/* ===== JSON-LD 可视化区块 ===== */
.json-ld-block {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 20px 0;
  font-family: "Courier New", monospace;
  font-size: 0.8rem;
  color: var(--color-text-light);
  overflow-x: auto;
  white-space: pre-wrap;
}

/* ===== 问答区 ===== */
.qa-list {
  max-width: 800px;
  margin: 0 auto;
}

.qa-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}

.qa-item .question {
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.qa-item .question::before {
  content: 'Q: ';
  color: var(--color-secondary);
  font-weight: 700;
}

.qa-item .answer {
  color: var(--color-text-light);
  font-size: 0.9rem;
  padding-left: 20px;
  border-left: 3px solid var(--color-primary);
}

.qa-item .answer::before {
  content: 'A: ';
  color: var(--color-primary);
  font-weight: 700;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .content-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 16px;
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--color-border);
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu a {
    width: 100%;
    padding: 12px 16px;
  }

  .nav-actions {
    display: none;
  }

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

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

  .hero-stats {
    gap: 20px;
  }

  .hero-stat .num {
    font-size: 1.5rem;
  }

  .section {
    padding: 40px 0;
  }

  .section-title h2 {
    font-size: 1.4rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .video-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

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

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

  .review-grid {
    grid-template-columns: 1fr;
  }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.1rem; }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .expert-grid {
    grid-template-columns: 1fr;
  }

  .partner-wall {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.pulse {
  animation: pulse 2s infinite;
}

/* ===== 懒加载占位 ===== */
img[loading="lazy"] {
  background: var(--color-bg-alt);
}

/* ===== 可访问性 ===== */
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}