/* ============================================
   抖阴 - 专业汽车改装视频社区
   原创CSS样式 | dz9au5f.cn
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --kkt-primary: #C41E3A;
  --kkt-primary-dark: #9B1830;
  --kkt-secondary: #1A1A2E;
  --kkt-accent: #E94560;
  --kkt-dark: #0F0F1A;
  --kkt-gray-900: #1C1C2E;
  --kkt-gray-800: #2D2D42;
  --kkt-gray-700: #3E3E56;
  --kkt-gray-600: #5A5A72;
  --kkt-gray-400: #9E9EB0;
  --kkt-gray-200: #D4D4DE;
  --kkt-gray-100: #ECECF1;
  --kkt-white: #FFFFFF;
  --kkt-gold: #FFB800;
  --kkt-green: #2ECC71;
  --kkt-blue: #3498DB;
  --kkt-font-cn: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;
  --kkt-radius: 8px;
  --kkt-radius-lg: 16px;
  --kkt-shadow: 0 4px 24px rgba(0,0,0,0.12);
  --kkt-shadow-lg: 0 8px 40px rgba(0,0,0,0.2);
  --kkt-transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

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

body {
  font-family: var(--kkt-font-cn);
  background: var(--kkt-dark);
  color: var(--kkt-gray-200);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.kkt-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* === 干扰标签隐藏 === */
.kkt-noise { position:absolute; left:-9999px; top:-9999px; width:0; height:0; overflow:hidden; visibility:hidden; font-size:0; line-height:0; }

/* === 头部导航 === */
.kkt-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15,15,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(196,30,58,0.2);
  transition: var(--kkt-transition);
}

.kkt-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

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

.kkt-logo img {
  height: 48px;
  width: auto;
}

.kkt-logo-text {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--kkt-white);
  letter-spacing: 1px;
}

.kkt-logo-text span {
  color: var(--kkt-primary);
}

.kkt-nav { display:flex; align-items:center; gap:6px; }

.kkt-nav a {
  color: var(--kkt-gray-200);
  font-size: 0.95rem;
  padding: 8px 16px;
  border-radius: var(--kkt-radius);
  transition: var(--kkt-transition);
  white-space: nowrap;
}

.kkt-nav a:hover, .kkt-nav a.active {
  color: var(--kkt-white);
  background: rgba(196,30,58,0.15);
}

.kkt-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--kkt-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* === 搜索框 === */
.kkt-search-bar {
  background: var(--kkt-gray-900);
  padding: 12px 0;
  margin-top: 72px;
  border-bottom: 1px solid rgba(196,30,58,0.1);
}

.kkt-search-wrap {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  gap: 8px;
  padding: 0 20px;
}

.kkt-search-input {
  flex: 1;
  background: var(--kkt-gray-800);
  border: 1px solid var(--kkt-gray-700);
  border-radius: var(--kkt-radius);
  padding: 10px 18px;
  color: var(--kkt-white);
  font-size: 0.95rem;
  outline: none;
  transition: var(--kkt-transition);
}

.kkt-search-input:focus {
  border-color: var(--kkt-primary);
  box-shadow: 0 0 0 3px rgba(196,30,58,0.15);
}

.kkt-search-input::placeholder { color: var(--kkt-gray-600); }

.kkt-search-btn {
  background: var(--kkt-primary);
  color: var(--kkt-white);
  border: none;
  border-radius: var(--kkt-radius);
  padding: 10px 24px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--kkt-transition);
  white-space: nowrap;
}

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

/* === Hero Banner === */
.kkt-hero {
  position: relative;
  height: 560px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kkt-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
}

.kkt-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 20px;
}

.kkt-hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--kkt-white);
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.kkt-hero h1 span { color: var(--kkt-primary); }

.kkt-hero p {
  font-size: 1.15rem;
  color: var(--kkt-gray-200);
  max-width: 640px;
  margin: 0 auto 28px;
  line-height: 1.8;
}

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

.kkt-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--kkt-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--kkt-transition);
  border: none;
  text-decoration: none;
}

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

.kkt-btn-primary:hover {
  background: var(--kkt-primary-dark);
  color: var(--kkt-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(196,30,58,0.35);
}

.kkt-btn-outline {
  background: transparent;
  color: var(--kkt-white);
  border: 2px solid rgba(255,255,255,0.3);
}

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

/* === 通用区块 === */
.kkt-section {
  padding: 72px 0;
}

.kkt-section-alt {
  background: var(--kkt-gray-900);
}

.kkt-section-title {
  text-align: center;
  margin-bottom: 48px;
}

.kkt-section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--kkt-white);
  margin-bottom: 12px;
}

.kkt-section-title h2 span { color: var(--kkt-primary); }

.kkt-section-title p {
  color: var(--kkt-gray-400);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
}

.kkt-tag {
  display: inline-block;
  background: rgba(196,30,58,0.12);
  color: var(--kkt-primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

/* === 视频卡片网格 === */
.kkt-video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.kkt-video-card {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius-lg);
  overflow: hidden;
  transition: var(--kkt-transition);
  position: relative;
}

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

.kkt-video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

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

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

.kkt-video-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: var(--kkt-transition);
}

.kkt-video-card:hover .kkt-video-play {
  opacity: 1;
}

.kkt-video-play-icon {
  width: 60px;
  height: 60px;
  background: var(--kkt-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--kkt-transition);
}

.kkt-video-play-icon::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--kkt-white);
  margin-left: 4px;
}

.kkt-video-card:hover .kkt-video-play-icon {
  transform: scale(1.1);
  box-shadow: 0 0 30px rgba(196,30,58,0.5);
}

.kkt-video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: var(--kkt-white);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.78rem;
}

.kkt-video-info {
  padding: 16px;
}

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

.kkt-video-meta {
  display: flex;
  gap: 16px;
  color: var(--kkt-gray-600);
  font-size: 0.82rem;
}

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

/* === 分类标签栏 === */
.kkt-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.kkt-tab {
  padding: 8px 22px;
  border-radius: 24px;
  background: var(--kkt-gray-800);
  color: var(--kkt-gray-400);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--kkt-transition);
  border: 1px solid transparent;
}

.kkt-tab:hover, .kkt-tab.active {
  background: rgba(196,30,58,0.15);
  color: var(--kkt-primary);
  border-color: rgba(196,30,58,0.3);
}

/* === AI赋能模块 === */
.kkt-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.kkt-ai-card {
  background: linear-gradient(135deg, var(--kkt-gray-800), var(--kkt-secondary));
  border-radius: var(--kkt-radius-lg);
  padding: 32px;
  border: 1px solid rgba(196,30,58,0.1);
  transition: var(--kkt-transition);
}

.kkt-ai-card:hover {
  border-color: rgba(196,30,58,0.3);
  transform: translateY(-4px);
  box-shadow: var(--kkt-shadow);
}

.kkt-ai-icon {
  width: 56px;
  height: 56px;
  background: rgba(196,30,58,0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.kkt-ai-card h3 {
  font-size: 1.2rem;
  color: var(--kkt-white);
  margin-bottom: 10px;
}

.kkt-ai-card p {
  color: var(--kkt-gray-400);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* === 专家展示 === */
.kkt-expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.kkt-expert-card {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--kkt-transition);
  border: 1px solid transparent;
}

.kkt-expert-card:hover {
  border-color: rgba(196,30,58,0.3);
  transform: translateY(-4px);
}

.kkt-expert-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 16px;
  overflow: hidden;
  border: 3px solid var(--kkt-primary);
}

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

.kkt-expert-card h4 {
  font-size: 1.05rem;
  color: var(--kkt-white);
  margin-bottom: 4px;
}

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

.kkt-expert-card p {
  color: var(--kkt-gray-400);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.kkt-expert-btns { display:flex; gap:8px; justify-content:center; }

.kkt-btn-sm {
  padding: 6px 16px;
  font-size: 0.8rem;
  border-radius: 20px;
}

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

.kkt-faq-item {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius);
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid rgba(196,30,58,0.08);
}

.kkt-faq-q {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--kkt-white);
  font-weight: 600;
  font-size: 0.98rem;
  transition: var(--kkt-transition);
}

.kkt-faq-q:hover { background: rgba(196,30,58,0.05); }

.kkt-faq-arrow {
  transition: var(--kkt-transition);
  font-size: 0.8rem;
  color: var(--kkt-primary);
}

.kkt-faq-item.open .kkt-faq-arrow { transform: rotate(180deg); }

.kkt-faq-a {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--kkt-gray-400);
  font-size: 0.92rem;
  line-height: 1.8;
}

.kkt-faq-item.open .kkt-faq-a {
  max-height: 300px;
  padding: 0 24px 18px;
}

/* === 用户评价 === */
.kkt-review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.kkt-review-card {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius-lg);
  padding: 28px;
  border: 1px solid rgba(196,30,58,0.08);
}

.kkt-review-stars {
  color: var(--kkt-gold);
  font-size: 0.9rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.kkt-review-card blockquote {
  color: var(--kkt-gray-200);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}

.kkt-review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.kkt-review-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--kkt-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kkt-white);
  font-weight: 700;
  font-size: 0.9rem;
}

.kkt-review-author-info strong {
  color: var(--kkt-white);
  font-size: 0.9rem;
}

.kkt-review-author-info span {
  color: var(--kkt-gray-600);
  font-size: 0.8rem;
  display: block;
}

/* === 合作品牌 === */
.kkt-partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  align-items: center;
  margin-bottom: 48px;
}

.kkt-partner-item {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius);
  padding: 20px 32px;
  color: var(--kkt-gray-400);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 2px;
  transition: var(--kkt-transition);
  border: 1px solid rgba(196,30,58,0.08);
}

.kkt-partner-item:hover {
  border-color: var(--kkt-primary);
  color: var(--kkt-white);
}

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

.kkt-contact-info h3 {
  font-size: 1.3rem;
  color: var(--kkt-white);
  margin-bottom: 20px;
}

.kkt-contact-list { list-style:none; }

.kkt-contact-list li {
  padding: 10px 0;
  color: var(--kkt-gray-200);
  font-size: 0.95rem;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.kkt-contact-list li strong {
  color: var(--kkt-primary);
  min-width: 80px;
}

.kkt-contact-qr {
  display: flex;
  gap: 24px;
  justify-content: center;
  align-items: flex-start;
}

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

.kkt-qr-item img {
  width: 160px;
  height: 160px;
  border-radius: var(--kkt-radius);
  margin-bottom: 8px;
}

.kkt-qr-item p {
  color: var(--kkt-gray-400);
  font-size: 0.85rem;
}

/* === 社交分享 === */
.kkt-share {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 24px 0;
}

.kkt-share-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kkt-white);
  font-size: 0.85rem;
  font-weight: 700;
  transition: var(--kkt-transition);
  cursor: pointer;
}

.kkt-share-btn:hover { transform:scale(1.15); }
.kkt-share-wechat { background:#07C160; }
.kkt-share-weibo { background:#E6162D; }
.kkt-share-douyin { background:#161823; border:1px solid #333; }
.kkt-share-bilibili { background:#00A1D6; }

/* === 页脚 === */
.kkt-footer {
  background: var(--kkt-secondary);
  border-top: 1px solid rgba(196,30,58,0.15);
  padding: 48px 0 24px;
}

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

.kkt-footer-brand h3 {
  font-size: 1.3rem;
  color: var(--kkt-white);
  margin-bottom: 12px;
}

.kkt-footer-brand p {
  color: var(--kkt-gray-400);
  font-size: 0.9rem;
  line-height: 1.7;
}

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

.kkt-footer-col ul { list-style:none; }

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

.kkt-footer-col ul li a {
  color: var(--kkt-gray-400);
  font-size: 0.88rem;
  transition: var(--kkt-transition);
}

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

.kkt-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.kkt-footer-bottom p {
  color: var(--kkt-gray-600);
  font-size: 0.85rem;
}

/* === 面包屑 === */
.kkt-breadcrumb {
  padding: 16px 0;
  margin-top: 72px;
}

.kkt-breadcrumb-list {
  display: flex;
  gap: 8px;
  align-items: center;
  list-style: none;
  font-size: 0.88rem;
  color: var(--kkt-gray-600);
}

.kkt-breadcrumb-list a { color: var(--kkt-gray-400); }
.kkt-breadcrumb-list a:hover { color: var(--kkt-primary); }
.kkt-breadcrumb-list .sep { color: var(--kkt-gray-700); }

/* === How-To指南 === */
.kkt-howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.kkt-step {
  text-align: center;
  padding: 28px 16px;
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius-lg);
  position: relative;
}

.kkt-step-num {
  width: 48px;
  height: 48px;
  background: var(--kkt-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kkt-white);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 auto 16px;
}

.kkt-step h4 {
  color: var(--kkt-white);
  font-size: 1rem;
  margin-bottom: 8px;
}

.kkt-step p {
  color: var(--kkt-gray-400);
  font-size: 0.88rem;
}

/* === 社区分类 === */
.kkt-community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.kkt-community-card {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius);
  padding: 24px;
  text-align: center;
  transition: var(--kkt-transition);
  border: 1px solid transparent;
}

.kkt-community-card:hover {
  border-color: rgba(196,30,58,0.3);
  transform: translateY(-3px);
}

.kkt-community-card h4 {
  color: var(--kkt-white);
  font-size: 1rem;
  margin-bottom: 6px;
}

.kkt-community-card p {
  color: var(--kkt-gray-400);
  font-size: 0.85rem;
}

.kkt-community-count {
  color: var(--kkt-primary);
  font-size: 0.82rem;
  margin-top: 8px;
}

/* === 统计数字 === */
.kkt-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  padding: 40px 0;
}

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

.kkt-stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--kkt-primary);
  line-height: 1;
  margin-bottom: 6px;
}

.kkt-stat-label {
  color: var(--kkt-gray-400);
  font-size: 0.9rem;
}

/* === 内页样式 === */
.kkt-page-hero {
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-top: 72px;
}

.kkt-page-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
}

.kkt-page-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.kkt-page-hero h1 {
  font-size: 2.2rem;
  color: var(--kkt-white);
  font-weight: 700;
}

.kkt-page-hero p {
  color: var(--kkt-gray-200);
  margin-top: 8px;
}

/* === MCP前端代码区 === */
.kkt-mcp-widget {
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius);
  padding: 20px;
  margin-top: 24px;
  border: 1px solid rgba(196,30,58,0.1);
}

.kkt-mcp-widget h4 {
  color: var(--kkt-white);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.kkt-mcp-input {
  width: 100%;
  background: var(--kkt-gray-900);
  border: 1px solid var(--kkt-gray-700);
  border-radius: var(--kkt-radius);
  padding: 12px;
  color: var(--kkt-white);
  font-size: 0.9rem;
  resize: vertical;
  min-height: 80px;
  outline: none;
}

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

/* === 响应式 === */
@media (max-width: 1024px) {
  .kkt-video-grid { grid-template-columns: repeat(2, 1fr); }
  .kkt-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .kkt-footer-grid { grid-template-columns: repeat(2, 1fr); }
  .kkt-howto-steps { grid-template-columns: repeat(2, 1fr); }
  .kkt-stats { gap:32px; }
}

@media (max-width: 768px) {
  .kkt-nav { display:none; position:absolute; top:72px; left:0; width:100%; background:var(--kkt-secondary); flex-direction:column; padding:16px; gap:4px; border-bottom:1px solid rgba(196,30,58,0.2); }
  .kkt-nav.open { display:flex; }
  .kkt-nav-toggle { display:block; }
  .kkt-hero { height:420px; }
  .kkt-hero h1 { font-size:1.8rem; }
  .kkt-video-grid { grid-template-columns: 1fr; }
  .kkt-ai-grid { grid-template-columns: 1fr; }
  .kkt-expert-grid { grid-template-columns: 1fr; }
  .kkt-review-grid { grid-template-columns: 1fr; }
  .kkt-contact-grid { grid-template-columns: 1fr; }
  .kkt-footer-grid { grid-template-columns: 1fr; }
  .kkt-howto-steps { grid-template-columns: 1fr; }
  .kkt-community-grid { grid-template-columns: 1fr; }
  .kkt-stats { flex-direction:column; gap:20px; }
  .kkt-section { padding:48px 0; }
  .kkt-section-title h2 { font-size:1.5rem; }
  .kkt-contact-qr { flex-direction:column; align-items:center; }
}

@media (max-width: 480px) {
  .kkt-hero { height:360px; }
  .kkt-hero h1 { font-size:1.5rem; }
  .kkt-hero-btns { flex-direction:column; align-items:center; }
  .kkt-btn { width:100%; justify-content:center; }
}

/* === 懒加载占位 === */
img[data-src] {
  background: var(--kkt-gray-800);
  min-height: 120px;
}

/* === 动画 === */
@keyframes kktFadeUp {
  from { opacity:0; transform:translateY(24px); }
  to { opacity:1; transform:translateY(0); }
}

.kkt-animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.kkt-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === 社区功能卡片 === */
.kkt-community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.kkt-community-card {
  background: linear-gradient(135deg, var(--kkt-gray-800), rgba(196,30,58,0.06));
  border-radius: var(--kkt-radius-lg);
  padding: 24px;
  border: 1px solid rgba(196,30,58,0.1);
  transition: var(--kkt-transition);
}

.kkt-community-card:hover {
  border-color: rgba(196,30,58,0.35);
  transform: translateY(-4px);
  box-shadow: var(--kkt-shadow);
}

.kkt-community-card h4 {
  color: var(--kkt-white);
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.kkt-community-card p {
  color: var(--kkt-gray-400);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 10px;
}

.kkt-community-count {
  color: var(--kkt-primary);
  font-size: 0.8rem;
  font-weight: 600;
}

/* === 合作品牌墙 === */
.kkt-partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 56px;
}

.kkt-partner-item {
  background: var(--kkt-gray-800);
  border: 1px solid var(--kkt-gray-700);
  border-radius: var(--kkt-radius);
  padding: 14px 28px;
  color: var(--kkt-gray-400);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 1px;
  transition: var(--kkt-transition);
}

.kkt-partner-item:hover {
  border-color: var(--kkt-primary);
  color: var(--kkt-white);
  background: rgba(196,30,58,0.08);
}

/* === How-To 步骤 === */
.kkt-howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.kkt-step {
  text-align: center;
  padding: 24px 16px;
  background: var(--kkt-gray-800);
  border-radius: var(--kkt-radius-lg);
  transition: var(--kkt-transition);
}

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

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

.kkt-step h4 {
  color: var(--kkt-white);
  font-size: 1rem;
  margin-bottom: 8px;
}

.kkt-step p {
  color: var(--kkt-gray-400);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* === Video标签样式覆盖 === */
.kkt-video-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--kkt-transition);
}

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

/* === 小按钮 === */
.kkt-btn-sm {
  padding: 6px 16px;
  font-size: 0.82rem;
}

/* === 专家按钮组 === */
.kkt-expert-btns {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

@media (max-width: 1024px) {
  .kkt-community-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .kkt-community-grid { grid-template-columns: 1fr; }
  .kkt-partner-wall { gap: 10px; }
  .kkt-partner-item { padding: 10px 18px; font-size: 0.82rem; }
  .kkt-howto-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .kkt-howto-steps { grid-template-columns: 1fr; }
}