/* ============================================
   17c一起草 - 原创CSS样式表
   品牌：17c一起草 | 域名：longxingkeji.cn
   配色：深邃夜蓝 + 赛车红 + 科技绿
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --primary: #1A1A2E;
  --accent: #E94560;
  --deep-blue: #0F3460;
  --tech-green: #16C79A;
  --bg-light: #F5F5F5;
  --text-dark: #2D2D2D;
  --card-bg: #FFFFFF;
  --border-light: #E0E0E0;
  --shadow-sm: 0 2px 8px rgba(26,26,46,0.08);
  --shadow-md: 0 4px 20px rgba(26,26,46,0.12);
  --shadow-lg: 0 8px 40px rgba(26,26,46,0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1280px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* === 顶部导航栏 === */
.site-header {
  background: var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 68px;
}

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

.site-logo img {
  height: 42px;
  width: auto;
}

.site-logo span {
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.main-nav a {
  color: rgba(255,255,255,0.85);
  padding: 22px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  display: block;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: #fff;
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 60%;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* === 搜索栏 === */
.search-bar {
  background: var(--deep-blue);
  padding: 14px 0;
}

.search-bar .container {
  display: flex;
  justify-content: center;
}

.search-form {
  display: flex;
  max-width: 640px;
  width: 100%;
  background: #fff;
  border-radius: 50px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.search-form input {
  flex: 1;
  border: none;
  outline: none;
  padding: 12px 24px;
  font-size: 0.95rem;
  color: var(--text-dark);
  background: transparent;
}

.search-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 28px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.search-form button:hover {
  background: #d63a52;
}

/* === 面包屑导航 === */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.85rem;
  color: #888;
}

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

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

.breadcrumb span {
  margin: 0 6px;
}

/* === Hero Banner === */
.hero-section {
  position: relative;
  height: 520px;
  overflow: hidden;
  background: var(--primary);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.55);
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  text-align: center;
  color: #fff;
  padding: 0 20px;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
  line-height: 1.3;
}

.hero-content h1 em {
  color: var(--accent);
  font-style: normal;
}

.hero-content p {
  font-size: 1.15rem;
  max-width: 640px;
  opacity: 0.9;
  margin-bottom: 28px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 13px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  border: 2px solid var(--accent);
}

.btn-primary:hover {
  background: transparent;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(233,69,96,0.4);
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: #fff;
  padding: 13px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid rgba(255,255,255,0.6);
  transition: var(--transition);
}

.btn-outline:hover {
  border-color: var(--tech-green);
  color: var(--tech-green);
  transform: translateY(-2px);
}

/* === 通用板块标题 === */
.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--tech-green));
  border-radius: 2px;
}

.section-title p {
  color: #777;
  font-size: 1rem;
  margin-top: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* === 通用内容区 === */
.section {
  padding: 72px 0;
}

.section-alt {
  background: #fff;
}

/* === 视频卡片网格 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

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

.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: var(--primary);
}

.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(233,69,96,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  cursor: pointer;
  z-index: 3;
}

.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 {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  z-index: 2;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 14px;
  font-size: 0.82rem;
  color: #999;
}

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

.video-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.video-tags span {
  background: rgba(15,52,96,0.08);
  color: var(--deep-blue);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
}

/* === 分类标签栏 === */
.tab-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 36px;
}

.tab-nav a {
  padding: 8px 22px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  background: #fff;
  color: var(--text-dark);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.tab-nav a:hover,
.tab-nav a.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* === 专家卡片 === */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.expert-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-top: 4px solid transparent;
}

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

.expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--accent);
}

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

.expert-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--primary);
}

.expert-card .role {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.expert-card p {
  font-size: 0.88rem;
  color: #777;
  line-height: 1.6;
  margin-bottom: 16px;
}

.expert-links {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.expert-links a {
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.expert-links a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* === AI赋能模块 === */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.ai-card {
  background: linear-gradient(135deg, var(--primary), var(--deep-blue));
  color: #fff;
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.ai-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(22,199,154,0.15) 0%, transparent 70%);
  transition: var(--transition);
}

.ai-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(15,52,96,0.3);
}

.ai-card .icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.ai-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.ai-card p {
  font-size: 0.9rem;
  opacity: 0.85;
  line-height: 1.7;
}

/* === 社区模块 === */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

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

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

.community-card .thumb {
  height: 160px;
  overflow: hidden;
}

.community-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.community-card .info {
  padding: 16px;
}

.community-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.community-card p {
  font-size: 0.85rem;
  color: #888;
}

/* === 合作品牌Logo墙 === */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: center;
  align-items: center;
}

.partner-wall .partner-item {
  width: 140px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  padding: 12px;
  transition: var(--transition);
  font-weight: 700;
  color: var(--deep-blue);
  font-size: 0.9rem;
}

.partner-wall .partner-item:hover {
  transform: scale(1.08);
  box-shadow: var(--shadow-md);
}

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

.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

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

.faq-question:hover {
  background: rgba(15,52,96,0.03);
}

.faq-question .arrow {
  transition: var(--transition);
  font-size: 1.2rem;
  color: var(--accent);
}

.faq-item.active .faq-question .arrow {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 0.92rem;
  color: #666;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  padding: 0 24px 18px;
  max-height: 300px;
}

/* === 用户评论 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border-left: 4px solid var(--tech-green);
}

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

.review-stars {
  color: #FFB800;
  font-size: 1rem;
  margin-bottom: 10px;
}

.review-card blockquote {
  font-size: 0.92rem;
  color: #555;
  line-height: 1.8;
  margin-bottom: 14px;
  font-style: italic;
}

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

.review-author .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--deep-blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

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

.review-author .date {
  font-size: 0.8rem;
  color: #aaa;
}

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.contact-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.contact-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--primary);
}

.contact-card p {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 8px;
}

.contact-card img {
  max-width: 160px;
  margin: 12px auto 0;
  border-radius: var(--radius-sm);
}

/* === 社交分享 === */
.share-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

.share-bar a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  transition: var(--transition);
}

.share-bar a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; }
.share-bilibili { background: #00A1D6; }

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

.howto-step {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
  counter-increment: step;
  transition: var(--transition);
}

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

.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 24px;
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.howto-step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  margin-top: 8px;
  color: var(--primary);
}

.howto-step p {
  font-size: 0.88rem;
  color: #777;
  line-height: 1.7;
}

/* === 页脚 === */
.site-footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

.footer-col p,
.footer-col a {
  font-size: 0.88rem;
  line-height: 2;
  display: block;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-col img {
  max-width: 120px;
  border-radius: var(--radius-sm);
  margin-top: 8px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--accent);
}

/* === 内页通用 === */
.page-hero {
  background: linear-gradient(135deg, var(--primary), var(--deep-blue));
  color: #fff;
  padding: 60px 0 48px;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 1rem;
  opacity: 0.85;
  max-width: 600px;
  margin: 0 auto;
}

/* === 数据统计条 === */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 36px 0;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin: -36px auto 0;
  position: relative;
  z-index: 3;
  max-width: 900px;
}

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

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

.stat-item .label {
  font-size: 0.85rem;
  color: #888;
  margin-top: 4px;
}

/* === 汽车传媒模块 === */
.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

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

.media-card .thumb {
  height: 180px;
  overflow: hidden;
  position: relative;
}

.media-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.media-card:hover .thumb img {
  transform: scale(1.06);
}

.media-card .badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--accent);
  color: #fff;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.media-card .info {
  padding: 16px;
}

.media-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.media-card p {
  font-size: 0.85rem;
  color: #888;
  line-height: 1.6;
}

/* === 内容文章 === */
.article-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin: 32px 0 16px;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--deep-blue);
  margin: 24px 0 12px;
}

.article-content p {
  margin-bottom: 16px;
  line-height: 1.9;
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}

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

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

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--primary);
    flex-direction: column;
    padding: 12px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  }

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

  .main-nav a {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
  }

  .hero-section {
    height: 400px;
  }

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

  .hero-content p {
    font-size: 0.95rem;
  }

  .section {
    padding: 48px 0;
  }

  .section-title h2 {
    font-size: 1.6rem;
  }

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

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

  .stats-bar {
    gap: 24px;
    margin: -24px 16px 0;
    padding: 24px 16px;
  }

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

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

  .page-hero h1 {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .hero-section {
    height: 340px;
  }

  .hero-content h1 {
    font-size: 1.5rem;
  }

  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

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

  .stats-bar {
    flex-direction: column;
    gap: 16px;
  }
}

/* === 懒加载占位 === */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.4s ease;
}

img[loading="lazy"].loaded,
img[loading="lazy"][src] {
  opacity: 1;
}

/* === MCP服务前端占位 === */
.mcp-widget {
  background: linear-gradient(135deg, var(--primary), var(--deep-blue));
  border-radius: var(--radius-md);
  padding: 24px;
  color: #fff;
  text-align: center;
  margin-top: 24px;
}

.mcp-widget h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.mcp-widget p {
  font-size: 0.85rem;
  opacity: 0.75;
}

.mcp-widget .mcp-status {
  display: inline-block;
  padding: 4px 14px;
  background: var(--tech-green);
  border-radius: 20px;
  font-size: 0.8rem;
  margin-top: 10px;
}