/* =============================================
   探花 - 主样式文件
   网站: 6688k.cn
   ============================================= */

/* CSS变量 */
:root {
  --primary: #e8436a;
  --primary-dark: #c0284d;
  --primary-light: #f8a5b8;
  --secondary: #ff7c5c;
  --accent: #ffd166;
  --bg-dark: #1a0a10;
  --bg-card: #2a1520;
  --bg-section: #f9f0f3;
  --text-dark: #1a0a10;
  --text-gray: #6b5560;
  --text-light: #f5e8ec;
  --border: #e8c5d0;
  --shadow: 0 4px 20px rgba(232, 67, 106, 0.15);
  --shadow-hover: 0 8px 30px rgba(232, 67, 106, 0.3);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s ease;
}

/* 重置样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  background: #fff;
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

/* =============================================
   顶部公告栏
   ============================================= */
.top-bar {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.5px;
}

.top-bar a {
  color: #fff;
  text-decoration: underline;
}

/* =============================================
   头部导航
   ============================================= */
.site-header {
  background: #fff;
  box-shadow: 0 2px 15px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.site-logo img {
  height: 44px;
  width: auto;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  color: var(--text-dark);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(232, 67, 106, 0.08);
}

.nav-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
}

.nav-btn:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary)) !important;
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* =============================================
   搜索栏
   ============================================= */
.search-bar-wrap {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
}

.search-form {
  display: flex;
  width: 100%;
  max-width: 600px;
  border: 2px solid var(--border);
  border-radius: 30px;
  overflow: hidden;
  background: #fff;
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 67, 106, 0.1);
}

.search-form input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-dark);
  background: transparent;
}

.search-form button {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: #fff;
  padding: 10px 24px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.search-form button:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  background: var(--bg-section);
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-gray);
}

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

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

.breadcrumb-inner .sep {
  color: var(--border);
}

/* =============================================
   Hero 横幅
   ============================================= */
.hero {
  position: relative;
  background: linear-gradient(135deg, #1a0a10 0%, #3d1525 50%, #1a0a10 100%);
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('../images/banner1.jpg') center/cover no-repeat;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-text h1 span {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 17px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.hero-tag {
  background: rgba(232, 67, 106, 0.2);
  border: 1px solid rgba(232, 67, 106, 0.4);
  color: var(--primary-light);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
}

.hero-btns {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.5);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

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

.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary-light);
  display: block;
}

.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}

.hero-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.hero-img-item {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.hero-img-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.hero-img-item:hover img {
  transform: scale(1.05);
}

.hero-img-item:first-child {
  grid-row: span 2;
}

.hero-img-item:first-child img {
  height: 415px;
}

/* =============================================
   通用容器
   ============================================= */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 70px 0;
}

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

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

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  background: rgba(232, 67, 106, 0.1);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  border: 1px solid rgba(232, 67, 106, 0.2);
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-dark .section-title {
  color: #fff;
}

.section-desc {
  font-size: 16px;
  color: var(--text-gray);
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-desc {
  color: rgba(255,255,255,0.6);
}

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: #1a0a10;
}

.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);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 54px;
  height: 54px;
  background: rgba(232, 67, 106, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}

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

.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
}

.video-info {
  padding: 14px;
}

.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-gray);
}

.video-stats {
  display: flex;
  gap: 12px;
}

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

.video-author {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-gray);
}

.author-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
}

/* =============================================
   功能分类
   ============================================= */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.category-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 2px solid transparent;
}

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

.category-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
}

.category-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.category-desc {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.6;
}

/* =============================================
   专家展示
   ============================================= */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.expert-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.expert-avatar {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.expert-info {
  padding: 20px;
}

.expert-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.expert-title {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 10px;
}

.expert-desc {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.6;
  margin-bottom: 15px;
}

.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 15px;
}

.expert-tag {
  background: rgba(232, 67, 106, 0.08);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  border: 1px solid rgba(232, 67, 106, 0.2);
}

.expert-btns {
  display: flex;
  gap: 10px;
}

.btn-sm {
  padding: 7px 16px;
  font-size: 13px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.btn-sm-primary {
  background: var(--primary);
  color: #fff;
}

.btn-sm-primary:hover {
  background: var(--primary-dark);
  color: #fff;
}

.btn-sm-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-gray);
}

.btn-sm-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* =============================================
   合作品牌
   ============================================= */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}

.partner-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 15px 30px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-gray);
  transition: var(--transition);
  text-align: center;
  min-width: 140px;
}

.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

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

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  background: #fff;
}

.faq-question {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-dark);
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(232, 67, 106, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 18px;
  transition: var(--transition);
  flex-shrink: 0;
}

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

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

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

.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
}

/* =============================================
   用户评论
   ============================================= */
.review-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.review-stars {
  color: var(--accent);
  font-size: 16px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 10px;
}

.reviewer-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.reviewer-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
}

.reviewer-date {
  font-size: 12px;
  color: var(--text-gray);
}

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(232, 67, 106, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.contact-detail strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 3px;
}

.contact-detail span {
  font-size: 14px;
  color: var(--text-gray);
}

.qr-group {
  display: flex;
  gap: 20px;
}

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

.qr-item img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.qr-label {
  font-size: 12px;
  color: var(--text-gray);
  margin-top: 6px;
}

/* =============================================
   分享按钮
   ============================================= */
.share-bar {
  background: var(--bg-section);
  padding: 30px 0;
  text-align: center;
}

.share-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 15px;
}

.share-btns {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  color: #fff;
}

.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; }
.share-bilibili { background: #00a1d6; }

.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  color: #fff;
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

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

.footer-brand .logo-text {
  font-size: 24px;
  margin-bottom: 15px;
  display: block;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--primary);
  color: #fff;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255,255,255,0.5);
  font-size: 13px;
}

.footer-bottom-links a:hover {
  color: var(--primary-light);
}

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  background: linear-gradient(135deg, var(--bg-dark), #3d1525);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(232,67,106,0.15) 0%, transparent 60%);
}

.page-hero-content {
  position: relative;
  z-index: 2;
}

.page-hero h1 {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 15px;
}

.page-hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  margin: 0 auto;
}

/* =============================================
   加入社区 How-To
   ============================================= */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.step-card {
  text-align: center;
  padding: 30px 20px;
  position: relative;
}

.step-num {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 15px;
}

.step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.6;
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-content { grid-template-columns: 1fr; }
  .hero-images { display: none; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open { display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: #fff; padding: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); z-index: 999; }
  .hamburger { display: flex; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 32px; }
  .section-title { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
}

/* =============================================
   辅助类
   ============================================= */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.mt-30 { margin-top: 30px; }
.mb-30 { margin-bottom: 30px; }

/* 懒加载占位 */
img[loading="lazy"] {
  background: linear-gradient(90deg, #f0e0e5 25%, #f8f0f3 50%, #f0e0e5 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 视频标签强调 */
.video-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(232, 67, 106, 0.1);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

/* 热门标签 */
.hot-tag {
  background: linear-gradient(135deg, #ff4757, #ff6b81);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

/* 新标签 */
.new-tag {
  background: linear-gradient(135deg, #2ed573, #1e90ff);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

/* 页面内容区 */
.page-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
}

/* 内页介绍文字 */
.page-intro {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
  border-left: 4px solid var(--primary);
}

.page-intro p {
  font-size: 15px;
  color: var(--text-gray);
  line-height: 1.9;
}

/* 更新时间 */
.update-time {
  font-size: 13px;
  color: var(--text-gray);
  margin-top: 8px;
}