/* 陈美娇 - 原创CSS样式 | jcwqwnnt.cn */
/* 配色：机械橙 + 深蓝钢 + 暗黑工业风 */

:root {
  --c-primary: #E85D04;
  --c-primary-light: #F48C06;
  --c-primary-dark: #C44B03;
  --c-secondary: #1B4965;
  --c-accent: #FFB703;
  --c-bg-dark: #0A0E14;
  --c-bg-card: #111820;
  --c-bg-card2: #0D1219;
  --c-text: #E8ECF0;
  --c-text-muted: #7A8A98;
  --c-border: rgba(232,93,4,0.18);
  --c-gradient: linear-gradient(135deg, #E85D04 0%, #F48C06 100%);
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--c-bg-dark);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--c-primary-light); text-decoration:none; transition: color 0.3s; }
a:hover { color: var(--c-accent); }

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

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

/* 顶部公告栏 */
.announce-bar {
  background: var(--c-gradient);
  color:#fff;
  text-align:center;
  padding:8px 16px;
  font-size:13px;
  font-weight:500;
  letter-spacing:0.5px;
}
.announce-bar a { color:#fff; text-decoration:underline; }

/* 头部导航 */
.site-header {
  background: rgba(10,14,20,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  position:sticky;
  top:0;
  z-index:1000;
  padding:12px 0;
}
.header-inner {
  display:flex;
  align-items:center;
  justify-content:space-between;
  max-width:1280px;
  margin:0 auto;
  padding:0 20px;
}
.logo-wrap { display:flex; align-items:center; gap:10px; }
.logo-wrap img { height:42px; width:auto; }
.logo-text {
  font-size:1.6rem;
  font-weight:800;
  color: var(--c-primary);
  letter-spacing:-0.5px;
}
.logo-sub { font-size:0.7rem; color:var(--c-text-muted); display:block; margin-top:-2px; }

.main-nav { display:flex; gap:28px; align-items:center; }
.main-nav a {
  color:var(--c-text);
  font-size:0.95rem;
  font-weight:500;
  padding:6px 0;
  position:relative;
  transition: color 0.3s;
}
.main-nav a:hover,
.main-nav a.active { color:var(--c-primary); }
.main-nav a.active::after {
  content:'';
  position:absolute;
  bottom:0;
  left:0;
  right:0;
  height:2px;
  background:var(--c-primary);
  border-radius:1px;
}

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

/* 搜索栏 */
.search-bar {
  background: var(--c-bg-card);
  border-bottom: 1px solid var(--c-border);
  padding:14px 0;
}
.search-inner {
  max-width:680px;
  margin:0 auto;
  display:flex;
  gap:10px;
  padding:0 20px;
}
.search-input {
  flex:1;
  background: var(--c-bg-dark);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  padding:10px 16px;
  color:var(--c-text);
  font-size:0.95rem;
  outline:none;
  transition: border-color 0.3s;
}
.search-input:focus { border-color:var(--c-primary); }
.search-input::placeholder { color:var(--c-text-muted); }
.search-btn {
  background: var(--c-gradient);
  border:none;
  border-radius:var(--radius);
  padding:10px 24px;
  color:#fff;
  font-weight:600;
  cursor:pointer;
  transition: transform 0.2s, box-shadow 0.3s;
}
.search-btn:hover { transform:translateY(-1px); box-shadow:0 4px 16px rgba(232,93,4,0.4); }
.search-tags {
  display:flex;
  gap:8px;
  margin-top:8px;
  max-width:680px;
  margin-left:auto;
  margin-right:auto;
  padding:0 20px;
  flex-wrap:wrap;
}
.search-tags span {
  font-size:0.8rem;
  color:var(--c-text-muted);
  background:var(--c-bg-dark);
  padding:3px 10px;
  border-radius:12px;
  cursor:pointer;
  transition: color 0.3s, background 0.3s;
}
.search-tags span:hover { color:var(--c-primary); background:rgba(232,93,4,0.1); }

/* Hero Banner */
.hero-section {
  position:relative;
  min-height:480px;
  display:flex;
  align-items:center;
  overflow:hidden;
}
.hero-bg {
  position:absolute;
  inset:0;
  background-size:cover;
  background-position:center;
  filter:brightness(0.35);
}
.hero-overlay {
  position:absolute;
  inset:0;
  background: linear-gradient(to right, rgba(10,14,20,0.92) 0%, rgba(10,14,20,0.5) 100%);
}
.hero-content {
  position:relative;
  z-index:2;
  max-width:680px;
  padding:60px 20px 60px 60px;
}
.hero-content h1 {
  font-size:2.8rem;
  font-weight:800;
  line-height:1.2;
  margin-bottom:16px;
}
.hero-content h1 span { color:var(--c-primary); }
.hero-content p {
  font-size:1.1rem;
  color:var(--c-text-muted);
  margin-bottom:24px;
  line-height:1.8;
}
.hero-btns { display:flex; gap:14px; flex-wrap:wrap; }
.btn-primary {
  background:var(--c-gradient);
  color:#fff;
  padding:12px 28px;
  border-radius:var(--radius);
  font-weight:600;
  font-size:0.95rem;
  border:none;
  cursor:pointer;
  transition: transform 0.2s, box-shadow 0.3s;
  display:inline-block;
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px rgba(232,93,4,0.4); color:#fff; }
.btn-outline {
  border:1px solid var(--c-primary);
  color:var(--c-primary);
  padding:12px 28px;
  border-radius:var(--radius);
  font-weight:600;
  font-size:0.95rem;
  background:transparent;
  cursor:pointer;
  transition: background 0.3s, color 0.3s;
  display:inline-block;
}
.btn-outline:hover { background:var(--c-primary); color:#fff; }

/* 数据统计条 */
.stats-bar {
  background: var(--c-bg-card);
  border-top:1px solid var(--c-border);
  border-bottom:1px solid var(--c-border);
  padding:24px 0;
}
.stats-grid {
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:20px;
  text-align:center;
}
.stat-item h3 {
  font-size:2rem;
  font-weight:800;
  color:var(--c-primary);
}
.stat-item p {
  font-size:0.85rem;
  color:var(--c-text-muted);
  margin-top:4px;
}

/* 通用Section */
.section {
  padding:60px 0;
}
.section-header {
  text-align:center;
  margin-bottom:40px;
}
.section-header h2 {
  font-size:1.9rem;
  font-weight:700;
  margin-bottom:10px;
}
.section-header h2 span { color:var(--c-primary); }
.section-header p {
  color:var(--c-text-muted);
  font-size:1rem;
  max-width:600px;
  margin:0 auto;
}
.section-alt { background:var(--c-bg-card2); }

/* 视频卡片网格 */
.video-grid {
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:20px;
}
.video-card {
  background:var(--c-bg-card);
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--c-border);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  cursor:pointer;
}
.video-card:hover {
  transform:translateY(-4px);
  box-shadow: var(--shadow);
  border-color:var(--c-primary);
}
.video-thumb {
  position:relative;
  padding-top:56.25%;
  overflow:hidden;
}
.video-thumb img {
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  transition: transform 0.4s;
}
.video-card:hover .video-thumb img { transform:scale(1.05); }
.video-play-btn {
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(0,0,0,0.4);
  opacity:0;
  transition: opacity 0.3s;
}
.video-card:hover .video-play-btn { opacity:1; }
.play-icon {
  width:52px;
  height:52px;
  background:var(--c-primary);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.2rem;
  color:#fff;
  box-shadow:0 4px 16px rgba(232,93,4,0.5);
}
.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:0.75rem;
  font-weight:600;
}
.video-badge {
  position:absolute;
  top:8px;
  left:8px;
  background:var(--c-primary);
  color:#fff;
  padding:3px 10px;
  border-radius:4px;
  font-size:0.72rem;
  font-weight:600;
}
.video-info { padding:14px; }
.video-title {
  font-size:0.9rem;
  font-weight:600;
  line-height:1.4;
  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:0.78rem;
  color:var(--c-text-muted);
}
.video-meta .views::before { content:'▶ '; }
.video-meta .likes::before { content:'♥ '; }

/* 分类标签 */
.cat-tabs {
  display:flex;
  gap:10px;
  margin-bottom:28px;
  flex-wrap:wrap;
  justify-content:center;
}
.cat-tab {
  padding:8px 20px;
  border-radius:20px;
  border:1px solid var(--c-border);
  background:transparent;
  color:var(--c-text-muted);
  font-size:0.88rem;
  cursor:pointer;
  transition: all 0.3s;
}
.cat-tab:hover,
.cat-tab.active {
  background:var(--c-primary);
  color:#fff;
  border-color:var(--c-primary);
}

/* 专家卡片 */
.expert-grid {
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:24px;
}
.expert-card {
  background:var(--c-bg-card);
  border-radius:var(--radius);
  padding:28px;
  text-align:center;
  border:1px solid var(--c-border);
  transition: transform 0.3s, border-color 0.3s;
}
.expert-card:hover { transform:translateY(-3px); border-color:var(--c-primary); }
.expert-avatar {
  width:90px;
  height:90px;
  border-radius:50%;
  object-fit:cover;
  margin:0 auto 14px;
  border:3px solid var(--c-primary);
}
.expert-card h4 { font-size:1.1rem; margin-bottom:4px; }
.expert-card .role { color:var(--c-primary); font-size:0.85rem; margin-bottom:10px; }
.expert-card .desc { color:var(--c-text-muted); font-size:0.85rem; line-height:1.6; }
.expert-btns { display:flex; gap:8px; justify-content:center; margin-top:14px; }
.expert-btns a {
  padding:6px 14px;
  border-radius:6px;
  font-size:0.8rem;
  font-weight:500;
}

/* 品牌Logo墙 */
.brand-wall {
  display:grid;
  grid-template-columns: repeat(6, 1fr);
  gap:16px;
}
.brand-item {
  background:var(--c-bg-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  padding:20px;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:80px;
  font-weight:700;
  font-size:0.9rem;
  color:var(--c-text-muted);
  transition: border-color 0.3s, color 0.3s;
}
.brand-item:hover { border-color:var(--c-primary); color:var(--c-primary); }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  background:var(--c-bg-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  margin-bottom:12px;
  overflow:hidden;
}
.faq-q {
  padding:18px 24px;
  font-weight:600;
  font-size:0.95rem;
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  transition: color 0.3s;
}
.faq-q:hover { color:var(--c-primary); }
.faq-q::after { content:'+'; font-size:1.3rem; color:var(--c-primary); transition:transform 0.3s; }
.faq-item.open .faq-q::after { transform:rotate(45deg); }
.faq-a {
  padding:0 24px;
  max-height:0;
  overflow:hidden;
  transition: max-height 0.4s ease, padding 0.4s;
  color:var(--c-text-muted);
  font-size:0.9rem;
  line-height:1.7;
}
.faq-item.open .faq-a { max-height:300px; padding:0 24px 18px; }

/* 用户评价 */
.review-grid {
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:20px;
}
.review-card {
  background:var(--c-bg-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  padding:24px;
}
.review-stars { color:var(--c-accent); margin-bottom:10px; font-size:0.9rem; }
.review-text { color:var(--c-text-muted); font-size:0.88rem; line-height:1.7; margin-bottom:14px; }
.review-author { font-weight:600; font-size:0.85rem; }
.review-author span { color:var(--c-text-muted); font-weight:400; }

/* 联系我们 */
.contact-grid {
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:30px;
}
.contact-info { display:flex; flex-direction:column; gap:16px; }
.contact-item {
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:16px;
  background:var(--c-bg-card);
  border-radius:var(--radius);
  border:1px solid var(--c-border);
}
.contact-item .icon {
  width:40px;
  height:40px;
  background:rgba(232,93,4,0.15);
  border-radius:8px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--c-primary);
  font-size:1.1rem;
  flex-shrink:0;
}
.contact-item h4 { font-size:0.9rem; margin-bottom:3px; }
.contact-item p { color:var(--c-text-muted); font-size:0.85rem; }
.contact-qr {
  display:flex;
  gap:20px;
  justify-content:center;
  align-items:center;
}
.qr-box { text-align:center; }
.qr-box img { width:140px; height:140px; border-radius:8px; margin-bottom:8px; }
.qr-box p { font-size:0.8rem; color:var(--c-text-muted); }

/* How-To指南 */
.steps-grid {
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:20px;
}
.step-card {
  background:var(--c-bg-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  padding:24px;
  text-align:center;
  position:relative;
}
.step-num {
  width:36px;
  height:36px;
  background:var(--c-gradient);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-weight:700;
  font-size:0.9rem;
  margin:0 auto 12px;
}
.step-card h4 { font-size:0.95rem; margin-bottom:8px; }
.step-card p { color:var(--c-text-muted); font-size:0.83rem; line-height:1.6; }

/* 分享按钮 */
.share-bar {
  display:flex;
  gap:10px;
  justify-content:center;
  padding:20px 0;
}
.share-btn {
  padding:8px 18px;
  border-radius:6px;
  font-size:0.82rem;
  font-weight:500;
  border:1px solid var(--c-border);
  background:var(--c-bg-card);
  color:var(--c-text);
  cursor:pointer;
  transition: border-color 0.3s, color 0.3s;
}
.share-btn:hover { border-color:var(--c-primary); color:var(--c-primary); }

/* 页脚 */
.site-footer {
  background:var(--c-bg-card2);
  border-top:1px solid var(--c-border);
  padding:48px 0 24px;
}
.footer-grid {
  display:grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap:30px;
  margin-bottom:30px;
}
.footer-brand .logo-wrap { margin-bottom:12px; }
.footer-brand p { color:var(--c-text-muted); font-size:0.85rem; line-height:1.7; }
.footer-col h4 {
  font-size:0.95rem;
  margin-bottom:14px;
  color:var(--c-text);
  position:relative;
  padding-bottom:8px;
}
.footer-col h4::after {
  content:'';
  position:absolute;
  bottom:0;
  left:0;
  width:30px;
  height:2px;
  background:var(--c-primary);
}
.footer-col a {
  display:block;
  color:var(--c-text-muted);
  font-size:0.85rem;
  padding:4px 0;
  transition: color 0.3s;
}
.footer-col a:hover { color:var(--c-primary); }
.footer-bottom {
  border-top:1px solid var(--c-border);
  padding-top:20px;
  text-align:center;
  color:var(--c-text-muted);
  font-size:0.82rem;
}
.footer-bottom a { color:var(--c-primary); }

/* 面包屑 */
.breadcrumb {
  padding:14px 0;
  font-size:0.84rem;
  color:var(--c-text-muted);
}
.breadcrumb a { color:var(--c-text-muted); }
.breadcrumb a:hover { color:var(--c-primary); }
.breadcrumb .sep { margin:0 8px; }

/* 内页Hero */
.inner-hero {
  background:var(--c-bg-card);
  border-bottom:1px solid var(--c-border);
  padding:48px 0;
  text-align:center;
}
.inner-hero h1 { font-size:2.2rem; font-weight:700; margin-bottom:10px; }
.inner-hero h1 span { color:var(--c-primary); }
.inner-hero p { color:var(--c-text-muted); font-size:1rem; }

/* 回到顶部 */
.back-to-top {
  position:fixed;
  bottom:30px;
  right:30px;
  width:44px;
  height:44px;
  background:var(--c-primary);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-size:1.2rem;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition: opacity 0.3s, transform 0.3s;
  z-index:999;
  box-shadow:0 4px 12px rgba(232,93,4,0.4);
}
.back-to-top.show { opacity:1; visibility:visible; }
.back-to-top:hover { transform:translateY(-3px); }

/* 移动端导航 */
.mobile-nav {
  display:none;
  position:fixed;
  inset:0;
  background:rgba(10,14,20,0.98);
  z-index:999;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:24px;
}
.mobile-nav.open { display:flex; }
.mobile-nav a { font-size:1.3rem; color:var(--c-text); font-weight:600; }
.mobile-nav a:hover { color:var(--c-primary); }
.mobile-nav .close-btn {
  position:absolute;
  top:20px;
  right:20px;
  font-size:2rem;
  color:var(--c-text);
  cursor:pointer;
  background:none;
  border:none;
}

/* AI赋能模块 */
.ai-grid {
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:20px;
}
.ai-card {
  background:var(--c-bg-card);
  border:1px solid var(--c-border);
  border-radius:var(--radius);
  padding:28px;
  text-align:center;
  transition: transform 0.3s, border-color 0.3s;
}
.ai-card:hover { transform:translateY(-3px); border-color:var(--c-primary); }
.ai-icon {
  width:56px;
  height:56px;
  background:rgba(232,93,4,0.12);
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin:0 auto 14px;
  font-size:1.5rem;
}
.ai-card h4 { font-size:1rem; margin-bottom:8px; }
.ai-card p { color:var(--c-text-muted); font-size:0.85rem; line-height:1.6; }

/* 响应式 */
@media (max-width:1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .brand-wall { grid-template-columns: repeat(4, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width:768px) {
  .main-nav { display:none; }
  .menu-toggle { display:block; }
  .hero-content { padding:40px 20px; }
  .hero-content h1 { font-size:1.8rem; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding:40px 0; }
  .section-header h2 { font-size:1.5rem; }
}

@media (max-width:480px) {
  .video-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .brand-wall { grid-template-columns: repeat(2, 1fr); }
  .hero-section { min-height:360px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap:12px; }
}