/* ===== 小欣奈 原创样式表 ===== */
/* 配色：活力橙#FF6B35 深邃蓝黑#1B2838 科技青绿#00D4AA 暗夜黑#0D1117 */

:root {
  --primary: #FF6B35;
  --primary-dark: #E55A28;
  --secondary: #1B2838;
  --accent: #00D4AA;
  --bg-dark: #0D1117;
  --bg-card: #161B22;
  --bg-card-hover: #1C2333;
  --text-main: #E6EDF3;
  --text-sub: #8B949E;
  --text-dim: #484F58;
  --border: #21262D;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,.35);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

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

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

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

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

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

.wrap { max-width:1200px; margin:0 auto; padding:0 20px; }

/* ===== 顶部导航 ===== */
.top-bar {
  position:sticky; top:0; z-index:1000;
  background: rgba(13,17,23,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 0;
}
.top-bar .wrap {
  display:flex; align-items:center; justify-content:space-between;
  height: 64px;
}
.brand-link {
  display:flex; align-items:center; gap:10px;
  font-size:1.2rem; font-weight:800; color:var(--text-main);
  white-space:nowrap;
}
.brand-link:hover { color:var(--primary); }
.brand-link img { border-radius:8px; }

.nav-toggle {
  display:none; background:none; border:none;
  color:var(--text-main); font-size:1.6rem; cursor:pointer;
}

.main-nav {
  list-style:none; display:flex; gap:6px;
}
.main-nav a {
  display:block; padding:8px 16px; border-radius:8px;
  color:var(--text-sub); font-size:.9rem; font-weight:500;
  transition: all var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color:var(--text-main); background:var(--bg-card);
}

/* ===== 搜索栏 ===== */
.search-strip {
  background: var(--secondary);
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.search-box {
  display:flex; max-width:600px; margin:0 auto;
}
.search-box input {
  flex:1; padding:10px 18px;
  background: var(--bg-card);
  border:1px solid var(--border); border-right:none;
  border-radius: var(--radius) 0 0 var(--radius);
  color:var(--text-main); font-size:.95rem;
  outline:none; transition: border-color var(--transition);
}
.search-box input:focus { border-color:var(--primary); }
.search-box input::placeholder { color:var(--text-dim); }
.search-box button {
  padding:10px 24px;
  background: var(--primary); color:#fff;
  border:none; border-radius:0 var(--radius) var(--radius) 0;
  font-size:.95rem; font-weight:600; cursor:pointer;
  transition: background var(--transition);
}
.search-box button:hover { background:var(--primary-dark); }

/* ===== 面包屑 ===== */
.breadcrumbs {
  padding:12px 0; font-size:.85rem; color:var(--text-sub);
}
.breadcrumbs a { color:var(--text-sub); }
.breadcrumbs a:hover { color:var(--primary); }
.crumb-sep { margin:0 8px; }

/* ===== Hero Banner ===== */
.hero-banner {
  position:relative; min-height:480px;
  display:flex; align-items:center;
  overflow:hidden;
}
.hero-bg {
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  transform:scale(1.05);
  transition: transform 8s ease;
}
.hero-banner:hover .hero-bg { transform:scale(1); }
.hero-overlay {
  position:absolute; inset:0;
  background: linear-gradient(135deg, rgba(13,17,23,.88) 0%, rgba(27,40,56,.72) 50%, rgba(13,17,23,.85) 100%);
}
.hero-content {
  position:relative; z-index:2;
  padding:60px 20px;
  max-width:800px;
}
.hero-content h1 {
  font-size:2.2rem; font-weight:900;
  line-height:1.3; margin-bottom:18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-sub {
  font-size:1.05rem; color:var(--text-sub);
  line-height:1.8; margin-bottom:28px;
}
.hero-btns { display:flex; gap:14px; flex-wrap:wrap; }

.btn {
  display:inline-block; padding:12px 28px;
  border-radius:var(--radius); font-size:.95rem; font-weight:600;
  cursor:pointer; transition:all var(--transition);
}
.btn-primary {
  background:var(--primary); color:#fff; border:2px solid var(--primary);
}
.btn-primary:hover { background:var(--primary-dark); border-color:var(--primary-dark); color:#fff; }
.btn-outline {
  background:transparent; color:var(--accent); border:2px solid var(--accent);
}
.btn-outline:hover { background:var(--accent); color:var(--bg-dark); }

/* ===== 通用 Section ===== */
.section { padding:60px 0; }
.section-dark { background:var(--secondary); }

.section-title {
  font-size:1.7rem; font-weight:800; text-align:center;
  margin-bottom:12px; color:var(--text-main);
}
.section-sub {
  text-align:center; color:var(--text-sub);
  font-size:.95rem; margin-bottom:40px;
  max-width:700px; margin-left:auto; margin-right:auto;
}
.sub-heading {
  font-size:1.3rem; font-weight:700; margin:48px 0 24px;
  text-align:center; color:var(--text-main);
}

/* ===== 视频卡片网格 ===== */
.grid-video {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.video-card {
  background:var(--bg-card);
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--border);
  transition:all var(--transition);
  cursor:pointer;
}
.video-card:hover {
  transform:translateY(-4px);
  border-color:var(--primary);
  box-shadow: 0 12px 40px rgba(255,107,53,.15);
}
.video-thumb {
  position:relative; padding-top:56.25%; overflow:hidden;
}
.video-thumb img {
  position:absolute; top:0; left:0; width:100%; height:100%;
  object-fit:cover; transition:transform var(--transition);
}
.video-card:hover .video-thumb img { transform:scale(1.08); }

.play-btn {
  position:absolute; top:50%; left:50%;
  transform:translate(-50%,-50%) scale(0);
  width:52px; height:52px;
  background:rgba(255,107,53,.9);
  border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  transition:all var(--transition);
  opacity:0;
}
.play-btn span {
  display:block; 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 {
  transform:translate(-50%,-50%) scale(1);
  opacity:1;
}

.video-duration {
  position:absolute; bottom:8px; right:8px;
  background:rgba(0,0,0,.75); color:#fff;
  padding:2px 8px; border-radius:4px;
  font-size:.75rem; font-weight:600;
}

.video-info { padding:14px; }
.video-info h3 {
  font-size:.88rem; font-weight:600;
  line-height:1.4; margin-bottom:8px;
  color:var(--text-main);
  display:-webkit-box; -webkit-line-clamp:2;
  -webkit-box-orient:vertical; overflow:hidden;
}
.video-meta {
  display:flex; gap:12px; flex-wrap:wrap;
  font-size:.75rem; color:var(--text-sub);
}

/* ===== 三列/四列/两列网格 ===== */
.grid-three { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid-four { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.grid-two { display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }

/* ===== 浮动卡片 ===== */
.float-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 24px;
  transition:all var(--transition);
}
.float-card:hover {
  transform:translateY(-4px);
  border-color:var(--accent);
  box-shadow:0 8px 32px rgba(0,212,170,.1);
}
.float-card .card-icon {
  font-size:2rem; margin-bottom:14px;
}
.float-card h3 {
  font-size:1.05rem; font-weight:700;
  margin-bottom:10px; color:var(--text-main);
}
.float-card p {
  font-size:.88rem; color:var(--text-sub); line-height:1.7;
}

.glow-card { border-color:rgba(0,212,170,.25); }
.glow-card:hover {
  box-shadow:0 0 24px rgba(0,212,170,.2), 0 8px 32px rgba(0,212,170,.1);
}

/* ===== Feature卡片 ===== */
.feature-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  transition:all var(--transition);
}
.feature-card:hover {
  transform:translateY(-4px);
  border-color:var(--primary);
}
.feature-card img {
  width:100%; height:180px; object-fit:cover;
  transition:transform var(--transition);
}
.feature-card:hover img { transform:scale(1.05); }
.feature-card h4 {
  padding:14px 16px 6px;
  font-size:.95rem; font-weight:700;
  color:var(--text-main);
}
.feature-card p {
  padding:0 16px 16px;
  font-size:.82rem; color:var(--text-sub); line-height:1.6;
}

/* ===== 社区卡片 ===== */
.community-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px;
  text-align:center;
  transition:all var(--transition);
}
.community-card:hover {
  transform:translateY(-4px);
  border-color:var(--primary);
}
.comm-icon { font-size:2.4rem; margin-bottom:12px; }
.community-card h4 {
  font-size:1rem; font-weight:700;
  margin-bottom:8px; color:var(--text-main);
}
.community-card p {
  font-size:.82rem; color:var(--text-sub); line-height:1.6;
  margin-bottom:12px;
}
.comm-tag {
  display:inline-block;
  padding:4px 12px; border-radius:20px;
  background:rgba(255,107,53,.12);
  color:var(--primary); font-size:.75rem; font-weight:600;
}

/* ===== 专家卡片 ===== */
.expert-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 20px;
  text-align:center;
  transition:all var(--transition);
}
.expert-card:hover {
  transform:translateY(-4px);
  border-color:var(--accent);
}
.expert-avatar {
  font-size:3rem; margin-bottom:12px;
  width:72px; height:72px; line-height:72px;
  background:var(--bg-dark); border-radius:50%;
  margin:0 auto 14px;
}
.expert-card h4 {
  font-size:1.1rem; font-weight:700;
  color:var(--text-main); margin-bottom:4px;
}
.expert-title {
  font-size:.8rem; color:var(--primary);
  margin-bottom:10px; font-weight:600;
}
.expert-card > p {
  font-size:.82rem; color:var(--text-sub);
  line-height:1.6; margin-bottom:14px;
}
.expert-links {
  display:flex; gap:10px; justify-content:center;
}
.expert-links a {
  padding:6px 14px; border-radius:6px;
  font-size:.8rem; font-weight:600;
  border:1px solid var(--primary);
  color:var(--primary);
  transition:all var(--transition);
}
.expert-links a:hover {
  background:var(--primary); color:#fff;
}

/* ===== 合作品牌墙 ===== */
.partner-wall {
  display:flex; flex-wrap:wrap; gap:16px;
  justify-content:center; margin-bottom:40px;
}
.partner-logo {
  padding:12px 28px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:8px;
  color:var(--text-sub); font-size:.9rem; font-weight:600;
  transition:all var(--transition);
}
.partner-logo:hover {
  border-color:var(--primary);
  color:var(--primary);
}

/* ===== How-To步骤 ===== */
.howto-steps {
  display:grid; grid-template-columns:repeat(4,1fr); gap:20px;
}
.step-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px;
  transition:all var(--transition);
}
.step-card:hover {
  border-color:var(--accent);
  transform:translateY(-3px);
}
.step-num {
  font-size:2rem; font-weight:900;
  color:var(--primary); margin-bottom:12px;
  line-height:1;
}
.step-card h4 {
  font-size:.95rem; font-weight:700;
  margin-bottom:8px; color:var(--text-main);
}
.step-card p {
  font-size:.82rem; color:var(--text-sub); line-height:1.6;
}

/* ===== FAQ ===== */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin-bottom:10px;
  overflow:hidden;
}
.faq-q {
  width:100%; padding:16px 20px;
  background:var(--bg-card);
  border:none; color:var(--text-main);
  font-size:.95rem; font-weight:600;
  text-align:left; cursor:pointer;
  display:flex; justify-content:space-between; align-items:center;
  transition:background var(--transition);
}
.faq-q:hover { background:var(--bg-card-hover); }
.faq-arrow {
  font-size:.7rem; transition:transform var(--transition);
  color:var(--text-sub);
}
.faq-item.open .faq-arrow { transform:rotate(180deg); }
.faq-a {
  max-height:0; overflow:hidden;
  transition:max-height .4s ease, padding .4s ease;
  padding:0 20px;
}
.faq-item.open .faq-a {
  max-height:300px; padding:0 20px 16px;
}
.faq-a p {
  font-size:.88rem; color:var(--text-sub); line-height:1.7;
}

/* ===== 评论卡片 ===== */
.review-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px;
  transition:all var(--transition);
}
.review-card:hover {
  border-color:var(--primary);
  transform:translateY(-2px);
}
.stars {
  color:#FFB800; font-size:1.1rem;
  margin-bottom:12px; letter-spacing:2px;
}
.review-card blockquote {
  font-size:.9rem; color:var(--text-main);
  line-height:1.7; margin-bottom:12px;
  font-style:italic;
}
.review-card cite {
  font-size:.8rem; color:var(--text-sub);
  font-style:normal;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:40px;
}
.contact-info h4, .contact-social h4 {
  font-size:1.15rem; font-weight:700;
  margin-bottom:14px; color:var(--text-main);
}
.contact-info > p {
  font-size:.9rem; color:var(--text-sub);
  line-height:1.7; margin-bottom:18px;
}
.contact-list {
  list-style:none;
}
.contact-list li {
  padding:8px 0;
  font-size:.88rem; color:var(--text-sub);
  border-bottom:1px solid var(--border);
}
.contact-list li strong { color:var(--text-main); }

.social-links {
  display:flex; gap:10px; margin-bottom:24px; flex-wrap:wrap;
}
.social-btn {
  padding:10px 22px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:8px;
  color:var(--text-main); font-size:.88rem; font-weight:600;
  transition:all var(--transition);
}
.social-btn:hover {
  background:var(--primary); border-color:var(--primary); color:#fff;
}

.qr-codes {
  display:flex; gap:24px; margin-bottom:20px;
}
.qr-item {
  text-align:center;
}
.qr-item img { border-radius:8px; margin-bottom:6px; }
.qr-item span { font-size:.78rem; color:var(--text-sub); }

.community-entries p {
  font-size:.88rem; color:var(--text-sub);
  margin-bottom:6px;
}
.community-entries strong { color:var(--text-main); }

/* ===== 底部 ===== */
.site-footer {
  background:var(--bg-card);
  border-top:1px solid var(--border);
  padding:48px 0 24px;
}
.footer-top {
  display:flex; justify-content:space-between; gap:40px;
  margin-bottom:32px;
}
.footer-brand {
  max-width:300px;
}
.footer-brand img { margin-bottom:12px; }
.footer-brand p {
  font-size:.85rem; color:var(--text-sub); line-height:1.6;
}
.footer-links {
  display:flex; gap:48px;
}
.footer-col h5 {
  font-size:.9rem; font-weight:700;
  color:var(--text-main); margin-bottom:14px;
}
.footer-col a {
  display:block; font-size:.82rem;
  color:var(--text-sub); margin-bottom:8px;
}
.footer-col a:hover { color:var(--primary); }

.footer-bottom {
  border-top:1px solid var(--border);
  padding-top:20px;
  text-align:center;
}
.footer-bottom p {
  font-size:.8rem; color:var(--text-dim);
  margin-bottom:4px;
}

/* ===== 响应式 ===== */
@media(max-width:1024px) {
  .grid-video { grid-template-columns:repeat(3,1fr); }
  .grid-four { grid-template-columns:repeat(2,1fr); }
  .howto-steps { grid-template-columns:repeat(2,1fr); }
}

@media(max-width:768px) {
  .nav-toggle { display:block; }
  .main-nav {
    display:none; flex-direction:column;
    position:absolute; top:64px; left:0; right:0;
    background:var(--bg-dark);
    border-bottom:1px solid var(--border);
    padding:12px;
  }
  .main-nav.open { display:flex; }
  .main-nav a { padding:12px 16px; }

  .hero-banner { min-height:360px; }
  .hero-content h1 { font-size:1.6rem; }
  .hero-sub { font-size:.9rem; }

  .grid-video { grid-template-columns:repeat(2,1fr); }
  .grid-three { grid-template-columns:1fr; }
  .grid-four { grid-template-columns:1fr; }
  .grid-two { grid-template-columns:1fr; }
  .contact-grid { grid-template-columns:1fr; }
  .howto-steps { grid-template-columns:1fr; }

  .footer-top { flex-direction:column; }
  .footer-links { flex-direction:column; gap:24px; }

  .section-title { font-size:1.3rem; }
}

@media(max-width:480px) {
  .grid-video { grid-template-columns:1fr; }
  .hero-content { padding:40px 16px; }
  .hero-content h1 { font-size:1.35rem; }
  .hero-btns { flex-direction:column; }
  .btn { text-align:center; }
}