/* ============================================
   精神小妹 修车改装视频社区 - 原创样式表
   域名: 3j0g.cn
   配色: 夜空黑 + 兰博基尼金 + 赛车红
   ============================================ */

/* === 基础重置与变量 === */
:root {
  --clr-bg: #0A0E14;
  --clr-surface: #0D1117;
  --clr-card: #161B22;
  --clr-card-hover: #1C2333;
  --clr-gold: #F7B731;
  --clr-gold-dark: #D4991A;
  --clr-red: #E74C3C;
  --clr-red-dark: #C0392B;
  --clr-text: #E8E8E8;
  --clr-text-muted: #8B949E;
  --clr-border: #21262D;
  --clr-overlay: rgba(10,14,20,0.85);
  --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --transition: all 0.3s ease;
  --max-w: 1280px;
}

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

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

body {
  font-family: var(--font-main);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* === 顶部导航 === */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(13,17,23,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  padding: 0 20px;
  height: 68px;
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

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

.logo-text {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--clr-gold);
  letter-spacing: 2px;
}

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

.main-nav a {
  color: var(--clr-text);
  font-size: 0.95rem;
  padding: 22px 18px;
  position: relative;
  font-weight: 500;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%; transform: translateX(-50%);
  width: 0; height: 3px;
  background: var(--clr-gold);
  border-radius: 2px;
  transition: width 0.3s;
}

.main-nav a:hover,
.main-nav a.active { color: var(--clr-gold); }

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* === 搜索栏 === */
.search-bar {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: 14px 20px;
  margin-top: 68px;
}

.search-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  gap: 0;
}

.search-input {
  flex: 1;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  padding: 10px 18px;
  font-size: 0.95rem;
  color: var(--clr-text);
  outline: none;
  transition: var(--transition);
}

.search-input:focus { border-color: var(--clr-gold); }

.search-input::placeholder { color: var(--clr-text-muted); }

.search-btn {
  background: var(--clr-gold);
  color: #000;
  border: none;
  padding: 10px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: var(--transition);
}

.search-btn:hover { background: var(--clr-gold-dark); }

/* === Hero Banner === */
.hero-section {
  position: relative;
  width: 100%;
  min-height: 520px;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.45);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,14,20,0.3) 0%, rgba(10,14,20,0.9) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 20px 60px;
  text-align: center;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.5);
}

.hero-content h1 span { color: var(--clr-gold); }

.hero-content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  max-width: 720px;
  margin: 0 auto 30px;
  line-height: 1.8;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.hero-tag {
  background: rgba(247,183,49,0.15);
  border: 1px solid rgba(247,183,49,0.3);
  color: var(--clr-gold);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
}

/* === 通用模块标题 === */
.section-heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-heading h2 {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.section-heading h2 span { color: var(--clr-gold); }

.section-heading p {
  color: var(--clr-text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-block {
  padding: 72px 0;
}

.section-block:nth-child(even) {
  background: var(--clr-surface);
}

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

.video-card {
  background: var(--clr-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--clr-border);
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--clr-gold);
}

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

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

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

.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity 0.3s;
}

.video-thumb:hover .play-overlay { opacity: 1; }

.play-icon {
  width: 60px;
  height: 60px;
  background: var(--clr-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 30px rgba(247,183,49,0.5);
}

.play-icon::after {
  content: '';
  display: block;
  width: 0; height: 0;
  border-style: solid;
  border-width: 12px 0 12px 22px;
  border-color: transparent transparent transparent #000;
  margin-left: 4px;
}

.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;
  font-weight: 600;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-text);
  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: 16px;
  color: var(--clr-text-muted);
  font-size: 0.82rem;
}

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

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

.video-tags span {
  background: rgba(247,183,49,0.1);
  color: var(--clr-gold);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
}

/* === 特色模块（横向卡片） === */
.feature-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-item {
  background: var(--clr-card);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--clr-border);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--clr-gold);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.feature-item h3 {
  font-size: 1.1rem;
  color: var(--clr-gold);
  margin-bottom: 8px;
}

.feature-item p {
  color: var(--clr-text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* === AI赋能模块 === */
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.ai-image { border-radius: var(--radius); overflow:hidden; }
.ai-image img { width:100%; border-radius: var(--radius); }

.ai-text h3 {
  font-size: 1.4rem;
  color: var(--clr-gold);
  margin-bottom: 16px;
}

.ai-list {
  list-style: none;
  padding: 0;
}

.ai-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--clr-border);
  color: var(--clr-text);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.ai-list li::before {
  content: '';
  width: 8px; height: 8px;
  background: var(--clr-gold);
  border-radius: 50%;
  flex-shrink: 0;
}

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

.expert-card {
  background: var(--clr-card);
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
  border: 1px solid var(--clr-border);
  transition: var(--transition);
}

.expert-card:hover { border-color: var(--clr-gold); transform: translateY(-4px); }

.expert-avatar {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.expert-details { padding: 20px 16px; }

.expert-details h3 {
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 4px;
}

.expert-details .role {
  color: var(--clr-gold);
  font-size: 0.85rem;
  margin-bottom: 10px;
  display: block;
}

.expert-details p {
  color: var(--clr-text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-bottom: 14px;
}

.expert-btn {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--clr-gold);
  color: var(--clr-gold);
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 0.82rem;
  transition: var(--transition);
}

.expert-btn:hover {
  background: var(--clr-gold);
  color: #000;
}

/* === 用户评论 === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--clr-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid var(--clr-border);
  position: relative;
}

.review-card::before {
  content: '\201C';
  font-size: 4rem;
  color: var(--clr-gold);
  opacity: 0.2;
  position: absolute;
  top: 8px; left: 16px;
  line-height: 1;
}

.review-text {
  color: var(--clr-text);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

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

.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--clr-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #000;
  font-size: 1rem;
}

.review-name {
  font-weight: 600;
  color: #fff;
  font-size: 0.88rem;
}

.review-stars {
  color: var(--clr-gold);
  font-size: 0.8rem;
  letter-spacing: 2px;
}

/* === FAQ 手风琴 === */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--clr-text);
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  font-family: var(--font-main);
}

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

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--clr-gold);
  transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
  content: '-';
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 18px;
  color: var(--clr-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

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

.brand-wall-item {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 18px 32px;
  color: var(--clr-text-muted);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 1px;
  transition: var(--transition);
}

.brand-wall-item:hover {
  border-color: var(--clr-gold);
  color: var(--clr-gold);
}

/* === 社交分享 === */
.share-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  padding: 10px 22px;
  border-radius: 24px;
  font-size: 0.88rem;
  transition: var(--transition);
}

.share-btn:hover {
  border-color: var(--clr-gold);
  color: var(--clr-gold);
}

/* === 页脚 === */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 56px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

.footer-brand .logo-text { font-size: 1.4rem; }

.footer-brand p {
  color: var(--clr-text-muted);
  font-size: 0.88rem;
  margin-top: 12px;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--clr-gold);
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 600;
}

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

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

.footer-col ul li a {
  color: var(--clr-text-muted);
  font-size: 0.88rem;
}

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

.footer-qr {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

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

.footer-qr-item img {
  width: 110px;
  height: 110px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
}

.footer-qr-item span {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--clr-text-muted);
}

.footer-bottom {
  border-top: 1px solid var(--clr-border);
  margin-top: 40px;
  padding: 20px;
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 0.82rem;
}

.footer-bottom span { color: var(--clr-gold); }

/* === 面包屑 === */
.breadcrumb-bar {
  background: var(--clr-surface);
  padding: 12px 0;
  border-bottom: 1px solid var(--clr-border);
}

.breadcrumb-list {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

.breadcrumb-list a { color: var(--clr-text-muted); }
.breadcrumb-list a:hover { color: var(--clr-gold); }
.breadcrumb-sep { margin: 0 8px; }
.breadcrumb-current { color: var(--clr-gold); }

/* === 内页Banner === */
.page-banner {
  position: relative;
  height: 320px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4);
}

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

.page-banner-content h1 {
  font-size: 2.2rem;
  color: #fff;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-banner-content p {
  color: rgba(255,255,255,0.8);
  font-size: 1.05rem;
}

/* === 联系方式模块 === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.contact-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-icon {
  font-size: 2rem;
  color: var(--clr-gold);
  flex-shrink: 0;
}

.contact-card h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 6px;
}

.contact-card p {
  color: var(--clr-text-muted);
  font-size: 0.88rem;
}

/* === 懒加载占位 === */
.lazy-img {
  opacity: 0;
  transition: opacity 0.5s;
}

.lazy-img.loaded { opacity: 1; }

/* === 响应式 === */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-row { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 768px) {
  .main-nav { 
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--clr-surface);
    flex-direction: column;
    padding: 10px 0;
    border-bottom: 1px solid var(--clr-border);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 24px; }
  .mobile-toggle { display: block; }

  .hero-content h1 { font-size: 1.8rem; }
  .hero-section { min-height: 380px; }

  .video-grid { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }

  .section-heading h2 { font-size: 1.5rem; }
  .section-block { padding: 48px 0; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.4rem; }
  .search-inner { flex-direction: column; }
  .search-input { border-radius: var(--radius-sm); border-right: 1px solid var(--clr-border); }
  .search-btn { border-radius: var(--radius-sm); margin-top: 8px; }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-qr { flex-direction: column; align-items: center; }
}