/* ============================================
   黑丝 - 暗夜赛车主题原创样式表
   品牌：黑丝 | 域名：owv50k.cn
   配色：暗夜蓝 #1A1A2E + 迈巴赫金 #D4AF37 + 赛车红 #C0392B
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --kk-dark: #0F0F1A;
  --kk-navy: #1A1A2E;
  --kk-gold: #D4AF37;
  --kk-red: #C0392B;
  --kk-silver: #E8E8E8;
  --kk-gray: #8B8BA3;
  --kk-card: #16162B;
  --kk-border: #2A2A45;
  --kk-hover: #D4AF3722;
  --kk-radius: 10px;
  --kk-shadow: 0 4px 24px rgba(0,0,0,0.4);
  --kk-gold-glow: 0 0 20px rgba(212,175,55,0.3);
  --kk-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: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--kk-dark);
  color: var(--kk-silver);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--kk-gold); text-decoration: none; transition: var(--kk-transition); }
a:hover { color: #f0d060; text-shadow: 0 0 8px rgba(212,175,55,0.5); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 {
  color: var(--kk-silver);
  font-weight: 700;
  line-height: 1.3;
}

/* === 干扰标签隐藏 === */
.kk-noise { display: none !important; visibility: hidden !important; height: 0 !important; overflow: hidden !important; position: absolute !important; left: -9999px !important; }

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

/* === 顶部导航 === */
.kk-header {
  background: linear-gradient(180deg, var(--kk-navy) 0%, rgba(15,15,26,0.95) 100%);
  border-bottom: 1px solid var(--kk-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
}
.kk-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1280px;
  margin: 0 auto;
}
.kk-logo { display: flex; align-items: center; gap: 12px; }
.kk-logo img { height: 48px; width: auto; border-radius: 6px; }
.kk-logo-text { font-size: 1.4rem; font-weight: 800; color: var(--kk-gold); letter-spacing: 2px; }
.kk-nav { display: flex; gap: 6px; }
.kk-nav a {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--kk-silver);
  font-weight: 500;
  transition: var(--kk-transition);
}
.kk-nav a:hover, .kk-nav a.active {
  background: var(--kk-hover);
  color: var(--kk-gold);
}
.kk-menu-toggle { display: none; background: none; border: none; color: var(--kk-gold); font-size: 1.5rem; cursor: pointer; }

/* === 搜索框 === */
.kk-search-bar {
  background: var(--kk-navy);
  border-bottom: 1px solid var(--kk-border);
  padding: 14px 0;
}
.kk-search-wrap {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  gap: 10px;
  padding: 0 20px;
}
.kk-search-input {
  flex: 1;
  padding: 12px 20px;
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: 50px;
  color: var(--kk-silver);
  font-size: 0.95rem;
  outline: none;
  transition: var(--kk-transition);
}
.kk-search-input:focus { border-color: var(--kk-gold); box-shadow: var(--kk-gold-glow); }
.kk-search-input::placeholder { color: var(--kk-gray); }
.kk-search-btn {
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--kk-gold), #b8941f);
  color: var(--kk-dark);
  border: none;
  border-radius: 50px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--kk-transition);
}
.kk-search-btn:hover { transform: scale(1.05); box-shadow: var(--kk-gold-glow); }

/* === Hero Banner === */
.kk-hero {
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.kk-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.5);
  z-index: 0;
}
.kk-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 20px;
}
.kk-hero h1 {
  font-size: 3rem;
  color: var(--kk-gold);
  text-shadow: 0 2px 20px rgba(212,175,55,0.5);
  margin-bottom: 16px;
}
.kk-hero h2 {
  font-size: 1.3rem;
  color: var(--kk-silver);
  font-weight: 400;
  margin-bottom: 24px;
  opacity: 0.9;
}
.kk-hero-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 20px; }
.kk-hero-tag {
  padding: 6px 18px;
  background: rgba(212,175,55,0.15);
  border: 1px solid rgba(212,175,55,0.3);
  border-radius: 50px;
  color: var(--kk-gold);
  font-size: 0.85rem;
}
.kk-hero-btn {
  display: inline-block;
  margin-top: 28px;
  padding: 14px 40px;
  background: linear-gradient(135deg, var(--kk-gold), #b8941f);
  color: var(--kk-dark);
  font-weight: 700;
  border-radius: 50px;
  font-size: 1.05rem;
  transition: var(--kk-transition);
}
.kk-hero-btn:hover { transform: translateY(-3px); box-shadow: var(--kk-gold-glow); color: var(--kk-dark); }

/* === 通用区块 === */
.kk-section { padding: 60px 0; }
.kk-section-alt { background: var(--kk-navy); }
.kk-section-title {
  text-align: center;
  margin-bottom: 40px;
}
.kk-section-title h2 {
  font-size: 2rem;
  color: var(--kk-gold);
  margin-bottom: 10px;
}
.kk-section-title h3 {
  font-size: 1.6rem;
  color: var(--kk-gold);
  margin-bottom: 8px;
}
.kk-section-title p {
  color: var(--kk-gray);
  font-size: 1rem;
}
.kk-gold-line {
  width: 60px;
  height: 3px;
  background: var(--kk-gold);
  margin: 12px auto 0;
  border-radius: 2px;
}

/* === 视频卡片网格 === */
.kk-video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.kk-video-card {
  background: var(--kk-card);
  border-radius: var(--kk-radius);
  overflow: hidden;
  border: 1px solid var(--kk-border);
  transition: var(--kk-transition);
  cursor: pointer;
}
.kk-video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--kk-shadow);
  border-color: var(--kk-gold);
}
.kk-video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}
.kk-video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.kk-video-card:hover .kk-video-thumb img { transform: scale(1.08); }
.kk-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(212,175,55,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--kk-transition);
}
.kk-play-btn::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 20px solid var(--kk-dark);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}
.kk-video-card:hover .kk-play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.kk-video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}
.kk-video-info { padding: 16px; }
.kk-video-info h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.kk-video-meta {
  display: flex;
  gap: 16px;
  color: var(--kk-gray);
  font-size: 0.82rem;
}
.kk-video-meta span { display: flex; align-items: center; gap: 4px; }

/* === 特色模块网格 === */
.kk-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.kk-feature-card {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--kk-transition);
}
.kk-feature-card:hover {
  border-color: var(--kk-gold);
  transform: translateY(-4px);
  box-shadow: var(--kk-gold-glow);
}
.kk-feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.kk-feature-card h4 {
  font-size: 1.15rem;
  color: var(--kk-gold);
  margin-bottom: 10px;
}
.kk-feature-card p {
  color: var(--kk-gray);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* === 四列网格 === */
.kk-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* === 专家卡片 === */
.kk-expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.kk-expert-card {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--kk-transition);
}
.kk-expert-card:hover {
  border-color: var(--kk-gold);
  box-shadow: var(--kk-gold-glow);
}
.kk-expert-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--kk-gold);
  margin: 0 auto 16px;
}
.kk-expert-card h4 {
  color: var(--kk-gold);
  font-size: 1.1rem;
  margin-bottom: 6px;
}
.kk-expert-card .kk-expert-role {
  color: var(--kk-gray);
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.kk-expert-card p {
  color: var(--kk-gray);
  font-size: 0.85rem;
  line-height: 1.5;
}
.kk-expert-btns { display: flex; gap: 8px; justify-content: center; margin-top: 14px; }
.kk-btn-sm {
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--kk-transition);
}
.kk-btn-gold { background: var(--kk-gold); color: var(--kk-dark); }
.kk-btn-gold:hover { background: #f0d060; color: var(--kk-dark); }
.kk-btn-outline { border: 1px solid var(--kk-gold); color: var(--kk-gold); background: transparent; }
.kk-btn-outline:hover { background: var(--kk-hover); }

/* === 品牌Logo墙 === */
.kk-brand-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.kk-brand-item {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: 8px;
  padding: 16px 28px;
  color: var(--kk-gray);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--kk-transition);
}
.kk-brand-item:hover { border-color: var(--kk-gold); color: var(--kk-gold); }

/* === FAQ === */
.kk-faq-list { max-width: 800px; margin: 0 auto; }
.kk-faq-item {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.kk-faq-q {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--kk-silver);
  transition: var(--kk-transition);
}
.kk-faq-q:hover { color: var(--kk-gold); }
.kk-faq-q::after { content: "+"; font-size: 1.3rem; color: var(--kk-gold); transition: var(--kk-transition); }
.kk-faq-item.active .kk-faq-q::after { content: "−"; }
.kk-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 24px;
  color: var(--kk-gray);
  line-height: 1.7;
}
.kk-faq-item.active .kk-faq-a { max-height: 300px; padding: 0 24px 18px; }

/* === 用户评论 === */
.kk-review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.kk-review-card {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 24px;
}
.kk-review-stars { color: var(--kk-gold); font-size: 0.9rem; margin-bottom: 10px; }
.kk-review-text { color: var(--kk-gray); font-size: 0.9rem; line-height: 1.6; margin-bottom: 14px; font-style: italic; }
.kk-review-author { display: flex; align-items: center; gap: 10px; }
.kk-review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--kk-gold);
  color: var(--kk-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}
.kk-review-name { font-weight: 600; font-size: 0.9rem; }
.kk-review-date { color: var(--kk-gray); font-size: 0.8rem; }

/* === 联系我们 === */
.kk-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.kk-contact-info { display: flex; flex-direction: column; gap: 16px; }
.kk-contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: 8px;
}
.kk-contact-icon { font-size: 1.5rem; flex-shrink: 0; }
.kk-contact-item h5 { color: var(--kk-gold); font-size: 0.95rem; margin-bottom: 4px; }
.kk-contact-item p { color: var(--kk-gray); font-size: 0.88rem; }
.kk-qr-grid { display: flex; gap: 20px; justify-content: center; }
.kk-qr-item { text-align: center; }
.kk-qr-item img { width: 160px; height: 160px; border-radius: 8px; border: 2px solid var(--kk-border); margin-bottom: 8px; }
.kk-qr-item p { color: var(--kk-gray); font-size: 0.85rem; }

/* === How-To 指南 === */
.kk-howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
}
.kk-howto-step {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  counter-increment: step;
}
.kk-howto-step::before {
  content: counter(step);
  display: block;
  width: 40px;
  height: 40px;
  background: var(--kk-gold);
  color: var(--kk-dark);
  border-radius: 50%;
  line-height: 40px;
  font-weight: 800;
  margin: 0 auto 14px;
  font-size: 1.1rem;
}
.kk-howto-step h4 { color: var(--kk-gold); margin-bottom: 8px; font-size: 1rem; }
.kk-howto-step p { color: var(--kk-gray); font-size: 0.85rem; }

/* === 社交分享 === */
.kk-share-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 20px 0;
}
.kk-share-btn {
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  transition: var(--kk-transition);
}
.kk-share-btn:hover { transform: translateY(-2px); color: #fff; }
.kk-share-wechat { background: #07C160; }
.kk-share-weibo { background: #E6162D; }
.kk-share-douyin { background: #161823; border: 1px solid #333; }
.kk-share-bilibili { background: #FB7299; }

/* === 页脚 === */
.kk-footer {
  background: var(--kk-navy);
  border-top: 1px solid var(--kk-border);
  padding: 40px 0 20px;
}
.kk-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}
.kk-footer-brand .kk-logo-text { margin-bottom: 12px; display: block; }
.kk-footer-brand p { color: var(--kk-gray); font-size: 0.88rem; line-height: 1.6; }
.kk-footer h5 { color: var(--kk-gold); font-size: 1rem; margin-bottom: 14px; }
.kk-footer-links a { display: block; color: var(--kk-gray); font-size: 0.88rem; padding: 4px 0; }
.kk-footer-links a:hover { color: var(--kk-gold); }
.kk-footer-bottom {
  border-top: 1px solid var(--kk-border);
  padding-top: 20px;
  text-align: center;
  color: var(--kk-gray);
  font-size: 0.82rem;
}

/* === 面包屑 === */
.kk-breadcrumb {
  padding: 14px 0;
  color: var(--kk-gray);
  font-size: 0.88rem;
}
.kk-breadcrumb a { color: var(--kk-gold); }
.kk-breadcrumb span { margin: 0 8px; }

/* === 内页Banner === */
.kk-page-banner {
  background: linear-gradient(135deg, var(--kk-navy), var(--kk-dark));
  padding: 60px 0;
  text-align: center;
  border-bottom: 1px solid var(--kk-border);
}
.kk-page-banner h1 { font-size: 2.2rem; color: var(--kk-gold); margin-bottom: 10px; }
.kk-page-banner p { color: var(--kk-gray); font-size: 1rem; }

/* === 两列布局 === */
.kk-two-col {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 30px;
}
.kk-sidebar-card {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 20px;
  margin-bottom: 20px;
}
.kk-sidebar-card h4 { color: var(--kk-gold); margin-bottom: 14px; font-size: 1.05rem; }
.kk-tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.kk-tag {
  padding: 4px 14px;
  background: var(--kk-hover);
  border: 1px solid var(--kk-border);
  border-radius: 50px;
  color: var(--kk-gray);
  font-size: 0.82rem;
  transition: var(--kk-transition);
}
.kk-tag:hover { border-color: var(--kk-gold); color: var(--kk-gold); }

/* === AI功能区 === */
.kk-ai-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.kk-ai-img { border-radius: var(--kk-radius); overflow: hidden; }
.kk-ai-img img { width: 100%; }
.kk-ai-features { display: flex; flex-direction: column; gap: 20px; }
.kk-ai-item { display: flex; gap: 14px; align-items: flex-start; }
.kk-ai-dot {
  width: 10px;
  height: 10px;
  background: var(--kk-gold);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 8px;
}
.kk-ai-item h4 { color: var(--kk-silver); font-size: 1rem; margin-bottom: 4px; }
.kk-ai-item p { color: var(--kk-gray); font-size: 0.88rem; }

/* === 社区卡片 === */
.kk-community-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.kk-community-card {
  background: var(--kk-card);
  border: 1px solid var(--kk-border);
  border-radius: var(--kk-radius);
  padding: 24px;
  text-align: center;
  transition: var(--kk-transition);
}
.kk-community-card:hover { border-color: var(--kk-gold); transform: translateY(-4px); }
.kk-community-card .kk-comm-icon { font-size: 2rem; margin-bottom: 12px; }
.kk-community-card h4 { color: var(--kk-gold); font-size: 1rem; margin-bottom: 8px; }
.kk-community-card p { color: var(--kk-gray); font-size: 0.85rem; }

/* === 里程碑 === */
.kk-timeline { max-width: 700px; margin: 0 auto; position: relative; padding-left: 30px; }
.kk-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--kk-gold);
}
.kk-timeline-item {
  position: relative;
  margin-bottom: 28px;
  padding-left: 24px;
}
.kk-timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--kk-gold);
  border-radius: 50%;
}
.kk-timeline-item h4 { color: var(--kk-gold); font-size: 0.95rem; margin-bottom: 4px; }
.kk-timeline-item p { color: var(--kk-gray); font-size: 0.88rem; }

/* === 响应式 === */
@media (max-width: 1024px) {
  .kk-video-grid, .kk-review-grid, .kk-feature-grid { grid-template-columns: repeat(2, 1fr); }
  .kk-expert-grid, .kk-community-grid, .kk-howto-steps, .kk-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .kk-footer-grid { grid-template-columns: 1fr 1fr; }
  .kk-ai-section { grid-template-columns: 1fr; }
  .kk-two-col { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .kk-nav { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--kk-navy); border-bottom: 1px solid var(--kk-border); padding: 10px; }
  .kk-nav.active { display: flex; }
  .kk-menu-toggle { display: block; }
  .kk-hero h1 { font-size: 2rem; }
  .kk-hero h2 { font-size: 1rem; }
  .kk-video-grid, .kk-review-grid, .kk-feature-grid { grid-template-columns: 1fr; }
  .kk-expert-grid, .kk-community-grid, .kk-howto-steps, .kk-grid-4 { grid-template-columns: 1fr; }
  .kk-contact-grid { grid-template-columns: 1fr; }
  .kk-footer-grid { grid-template-columns: 1fr; }
  .kk-section { padding: 40px 0; }
  .kk-section-title h2 { font-size: 1.5rem; }
}