/* 探花 - akjrff.cn 主样式文件 */
/* 原创设计，版权所有 © 2026 探花传媒 */

:root {
  --primary: #c0392b;
  --primary-dark: #96281b;
  --primary-light: #e74c3c;
  --secondary: #2c3e50;
  --secondary-light: #34495e;
  --accent: #f39c12;
  --accent-light: #f1c40f;
  --bg-main: #0d0d0d;
  --bg-card: #1a1a1a;
  --bg-card2: #222222;
  --text-primary: #f0f0f0;
  --text-secondary: #aaaaaa;
  --text-muted: #666666;
  --border: #333333;
  --border-light: #444444;
  --gradient-hero: linear-gradient(135deg, #1a0000 0%, #2d0a0a 40%, #0d0d0d 100%);
  --gradient-card: linear-gradient(180deg, rgba(192,57,43,0.08) 0%, rgba(0,0,0,0) 100%);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.5);
  --shadow-hover: 0 8px 30px rgba(192,57,43,0.25);
  --radius: 8px;
  --radius-lg: 14px;
  --transition: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--primary-dark);
  padding: 6px 0;
  font-size: 12px;
  color: rgba(255,255,255,0.8);
  text-align: center;
  letter-spacing: 0.5px;
}
.top-bar a { color: var(--accent-light); }

/* ===== 头部导航 ===== */
.site-header {
  background: rgba(13,13,13,0.97);
  border-bottom: 2px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -1px;
  box-shadow: 0 0 12px rgba(192,57,43,0.5);
}
.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 2px;
}
.logo-text span { color: var(--primary-light); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}
.main-nav a {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: #fff;
  background: rgba(192,57,43,0.2);
}

/* ===== 搜索框 ===== */
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: var(--transition);
  flex-shrink: 0;
}
.header-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(192,57,43,0.2);
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 13px;
  padding: 7px 14px;
  width: 180px;
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 7px 14px;
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
}
.header-search button:hover { background: var(--primary-dark); }

/* ===== 搜索区域（导航下方） ===== */
.nav-search-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.nav-search-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-search-inner .search-wrap {
  display: flex;
  flex: 1;
  max-width: 600px;
  background: var(--bg-card2);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  overflow: hidden;
}
.nav-search-inner .search-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  padding: 9px 18px;
}
.nav-search-inner .search-wrap input::placeholder { color: var(--text-muted); }
.nav-search-inner .search-wrap button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 9px 22px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  border-radius: 0 24px 24px 0;
}
.nav-search-inner .search-wrap button:hover { background: var(--primary-dark); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tags a {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-card2);
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.search-tags a:hover { color: var(--primary-light); border-color: var(--primary); }

/* ===== 汉堡菜单 ===== */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 18px;
}

/* ===== 英雄区 ===== */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-hero);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/images/hero_banner.jpg');
  background-size: cover;
  background-position: center top;
  opacity: 0.25;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13,13,13,0.95) 0%, rgba(13,13,13,0.6) 60%, transparent 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  letter-spacing: 1px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.hero-content h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  color: #fff;
}
.hero-content h1 em {
  font-style: normal;
  color: var(--primary-light);
}
.hero-content p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  padding: 12px 28px;
  border-radius: 24px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); color: #fff; }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 12px 28px;
  border-radius: 24px;
  font-weight: 600;
  font-size: 15px;
  border: 1.5px solid rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-outline:hover { border-color: var(--primary-light); color: var(--primary-light); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero-stat { text-align: left; }
.hero-stat .num {
  font-size: 26px;
  font-weight: 900;
  color: var(--primary-light);
  line-height: 1;
}
.hero-stat .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== 通用区块 ===== */
.section { padding: 60px 0; }
.section-inner { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section-header { margin-bottom: 36px; }
.section-header h2 {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-header h2::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--primary);
  border-radius: 2px;
}
.section-header p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 8px;
}
.section-header .more-link {
  float: right;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}
.section-header .more-link:hover { color: var(--primary-light); }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border);
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: var(--bg-card2);
}
.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  background: rgba(0,0,0,0.4);
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 52px;
  height: 52px;
  background: rgba(192,57,43,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  border: 2px solid rgba(255,255,255,0.3);
}
.play-icon::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 分类导航 ===== */
.cat-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.cat-btn {
  background: var(--bg-card2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.cat-btn:hover, .cat-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.expert-avatar {
  position: relative;
  padding-top: 100%;
  overflow: hidden;
  background: var(--bg-card2);
}
.expert-avatar img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.expert-info { padding: 16px; }
.expert-name { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.expert-title { font-size: 12px; color: var(--primary-light); margin-bottom: 8px; }
.expert-desc { font-size: 12px; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card2);
  cursor: pointer;
  transition: var(--transition);
}
.btn-sm:hover { border-color: var(--primary); color: var(--primary-light); }
.btn-sm.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-sm.primary:hover { background: var(--primary-dark); }

/* ===== 评论区 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { border-color: var(--primary); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user { font-size: 14px; font-weight: 600; color: #fff; }
.review-date { font-size: 11px; color: var(--text-muted); }
.review-stars { color: var(--accent); font-size: 13px; margin-bottom: 8px; }
.review-text { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-q {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}
.faq-q:hover { background: rgba(192,57,43,0.1); }
.faq-q .arrow {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform 0.3s;
}
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 16px; }

/* ===== 合作品牌 ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 12px;
  text-align: center;
  transition: var(--transition);
}
.partner-item:hover { border-color: var(--primary); background: rgba(192,57,43,0.05); }
.partner-logo {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: #fff;
}
.partner-name { font-size: 13px; color: var(--text-secondary); }

/* ===== 联系区 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.contact-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
}
.contact-card h3 { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.contact-item { display: flex; gap: 12px; margin-bottom: 14px; align-items: flex-start; }
.contact-icon { font-size: 18px; flex-shrink: 0; margin-top: 2px; }
.contact-label { font-size: 12px; color: var(--text-muted); }
.contact-value { font-size: 14px; color: var(--text-primary); }

/* ===== 二维码 ===== */
.qr-grid { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-box {
  width: 100px;
  height: 100px;
  background: #fff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
  padding: 8px;
}
.qr-box svg { width: 84px; height: 84px; }
.qr-label { font-size: 12px; color: var(--text-muted); }

/* ===== 社交分享 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}
.share-label { font-size: 13px; color: var(--text-muted); }
.share-btn {
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  color: #fff;
}
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #010101; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* ===== 页脚 ===== */
.site-footer {
  background: #080808;
  border-top: 2px solid var(--primary);
  padding: 48px 0 24px;
  margin-top: 60px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text { font-size: 24px; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 13px; color: var(--text-muted); line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { font-size: 13px; color: var(--text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary-light); }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-card);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--primary-light); }
.breadcrumb-inner .sep { color: var(--border-light); }
.breadcrumb-inner .current { color: var(--text-secondary); }

/* ===== 内页头部 ===== */
.page-hero {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}
.page-hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.page-hero h1 {
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}
.page-hero p { font-size: 15px; color: var(--text-secondary); max-width: 600px; }

/* ===== 标签 ===== */
.tag-list { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(192,57,43,0.15);
  color: var(--primary-light);
  border: 1px solid rgba(192,57,43,0.3);
}

/* ===== 统计数字 ===== */
.stats-bar {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.stat-item { text-align: center; }
.stat-num { font-size: 28px; font-weight: 900; color: var(--primary-light); }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ===== 新闻列表 ===== */
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex;
  gap: 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.news-item:hover { border-color: var(--primary); }
.news-thumb {
  width: 140px;
  flex-shrink: 0;
  overflow: hidden;
  background: var(--bg-card2);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-body { padding: 16px; flex: 1; }
.news-title { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 8px; line-height: 1.5; }
.news-excerpt { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 10px; }
.news-meta { font-size: 12px; color: var(--text-muted); display: flex; gap: 16px; }

/* ===== 工具卡片 ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.tool-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.tool-card:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.tool-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(192,57,43,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
}
.tool-name { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.tool-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .header-inner { gap: 12px; }
  .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(13,13,13,0.98); flex-direction: column; padding: 16px 20px; gap: 4px; border-bottom: 1px solid var(--border); }
  .main-nav.open { display: flex; }
  .menu-toggle { display: block; margin-left: auto; }
  .header-search { display: none; }
  .hero-section { min-height: 380px; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .news-item { flex-direction: column; }
  .news-thumb { width: 100%; height: 160px; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
}

/* ===== 页脚新布局 ===== */
.footer-inner { max-width:1280px; margin:0 auto; padding:48px 20px; display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; }
.footer-brand .footer-logo { display:flex; align-items:center; gap:10px; margin-bottom:16px; }
.footer-brand .footer-logo .logo-icon { width:36px; height:36px; font-size:18px; border-radius:6px; }
.footer-brand .footer-logo .logo-text { font-size:18px; font-weight:900; color:#fff; }
.footer-desc { font-size:13px; color:var(--text-muted); line-height:1.8; margin-bottom:16px; }
.footer-contact { display:flex; flex-direction:column; gap:6px; font-size:12px; color:#555; }
.footer-nav-group h4 { font-size:14px; font-weight:700; color:#fff; margin-bottom:16px; padding-bottom:8px; border-bottom:1px solid #1a1a1a; }
.footer-nav-group nav { display:flex; flex-direction:column; gap:8px; }
.footer-nav-group a { font-size:13px; color:var(--text-muted); transition:color 0.2s; }
.footer-nav-group a:hover { color:var(--primary-light); }
.footer-bottom { background:#050505; border-top:1px solid #111; padding:16px 20px; }
.footer-bottom-inner { max-width:1280px; margin:0 auto; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
.footer-bottom-left p { font-size:12px; color:#444; line-height:1.8; }
.footer-bottom-right { display:flex; gap:16px; }
.footer-bottom-right a { font-size:12px; color:#555; }
.footer-bottom-right a:hover { color:var(--primary-light); }
/* 回到顶部 */
.back-top { position:fixed; bottom:24px; right:24px; width:44px; height:44px; background:var(--primary); color:#fff; border-radius:50%; font-size:18px; border:none; cursor:pointer; opacity:0; transition:opacity 0.3s; z-index:999; box-shadow:0 4px 12px rgba(192,57,43,0.4); }
.back-top:hover { background:var(--primary-light); }
@media (max-width:1024px) { .footer-inner { grid-template-columns:1fr 1fr; } .footer-brand { grid-column:1/-1; } }
@media (max-width:768px) { .footer-inner { grid-template-columns:1fr 1fr; gap:24px; } .footer-bottom-inner { flex-direction:column; text-align:center; } }
@media (max-width:480px) { .footer-inner { grid-template-columns:1fr; } }