/* ============================================
   福利导航 - 原创样式表
   品牌：福利导航 | 域名：ysytndd.cn
   配色：深紫黑 + 活力橙 + 荧光青绿
   ============================================ */

/* --- CSS Variables --- */
:root {
  --primary: #1a0a2e;
  --secondary: #ff6b35;
  --accent: #00d4aa;
  --bg-dark: #0d0d1a;
  --bg-card: #16102a;
  --bg-card-hover: #1e1540;
  --text-main: #e8e8f0;
  --text-muted: #9a95b0;
  --text-bright: #ffffff;
  --gradient-start: #1a0a2e;
  --gradient-end: #2d1b69;
  --border-color: #2a1f4e;
  --shadow-glow: rgba(0, 212, 170, 0.15);
  --shadow-orange: rgba(255, 107, 53, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
  --max-width: 1280px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--secondary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-bright); }

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

/* --- Header / Navigation --- */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(13, 13, 26, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max-width); margin: 0 auto; padding: 0 20px; height: 68px;
}
.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { height: 42px; width: auto; }
.site-logo span { font-size: 1.25rem; font-weight: 800; color: var(--secondary); letter-spacing: 1px; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm); font-size: 0.9rem;
  color: var(--text-main); font-weight: 500; transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--accent); background: rgba(0, 212, 170, 0.08);
}
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text-main);
  margin: 5px 0; transition: var(--transition);
}

/* --- Search Bar --- */
.search-bar {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  padding: 16px 0; border-bottom: 1px solid var(--border-color);
  margin-top: 68px;
}
.search-bar .container { display: flex; justify-content: center; }
.search-wrap {
  display: flex; max-width: 600px; width: 100%;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border-color);
  border-radius: 50px; overflow: hidden; transition: border-color var(--transition);
}
.search-wrap:focus-within { border-color: var(--accent); }
.search-wrap input {
  flex: 1; padding: 12px 24px; background: transparent; border: none;
  color: var(--text-main); font-size: 0.95rem; outline: none;
}
.search-wrap input::placeholder { color: var(--text-muted); }
.search-wrap button {
  padding: 12px 28px; background: var(--accent); border: none;
  color: var(--primary); font-weight: 600; cursor: pointer;
  transition: background var(--transition); font-size: 0.9rem;
}
.search-wrap button:hover { background: var(--secondary); color: #fff; }

/* --- Banner / Hero --- */
.hero-banner {
  position: relative; overflow: hidden;
  min-height: 520px; display: flex; align-items: center; justify-content: center;
  background-size: cover; background-position: center; background-repeat: no-repeat;
}
.hero-banner::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,13,26,0.5) 0%, rgba(26,10,46,0.85) 100%);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 800px; padding: 60px 20px;
}
.hero-content h1 { font-size: 2.8rem; margin-bottom: 16px; }
.hero-content h1 .brand-highlight { color: var(--secondary); }
.hero-content p { font-size: 1.15rem; color: var(--text-muted); margin-bottom: 28px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px; font-weight: 600;
  font-size: 0.95rem; cursor: pointer; transition: all var(--transition);
  border: none; text-decoration: none;
}
.btn-primary { background: var(--secondary); color: #fff; }
.btn-primary:hover { background: #e85a28; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px var(--shadow-orange); }
.btn-outline {
  background: transparent; color: var(--accent);
  border: 2px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: var(--primary); transform: translateY(-2px); }

/* --- Section Common --- */
.section { padding: 72px 0; }
.section-alt { background: linear-gradient(180deg, var(--bg-dark) 0%, #110e22 100%); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 2rem; margin-bottom: 12px; }
.section-header h2 .accent { color: var(--accent); }
.section-header h2 .orange { color: var(--secondary); }
.section-header p { color: var(--text-muted); font-size: 1rem; max-width: 640px; margin: 0 auto; }
.section-tag {
  display: inline-block; padding: 4px 16px; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 12px;
  background: rgba(0, 212, 170, 0.1); color: var(--accent);
  border: 1px solid rgba(0, 212, 170, 0.2);
}

/* --- Video Card Grid --- */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border-color);
  transition: all var(--transition); cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 36px var(--shadow-glow);
}
.video-thumb {
  position: relative; padding-top: 56.25%; overflow: hidden;
  background: var(--primary);
}
.video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 60px; height: 60px; border-radius: 50%;
  background: rgba(255, 107, 53, 0.9); display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--transition);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.4);
}
.play-btn::after {
  content: ''; width: 0; height: 0;
  border-left: 18px solid #fff; border-top: 11px solid transparent; border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-card:hover .play-btn { opacity: 1; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); padding: 2px 8px; border-radius: 4px;
  font-size: 0.8rem; color: #fff;
}
.video-info { padding: 16px; }
.video-info h3 { font-size: 1rem; margin-bottom: 8px; line-height: 1.4; }
.video-meta {
  display: flex; align-items: center; gap: 16px;
  font-size: 0.82rem; color: var(--text-muted);
}
.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 {
  padding: 2px 10px; border-radius: 50px; font-size: 0.75rem;
  background: rgba(0, 212, 170, 0.08); color: var(--accent);
  border: 1px solid rgba(0, 212, 170, 0.15);
}

/* --- Feature Cards --- */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 32px 24px; border: 1px solid var(--border-color);
  transition: all var(--transition); text-align: center;
}
.feature-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 8px 32px var(--shadow-orange);
  transform: translateY(-4px);
}
.feature-icon {
  width: 64px; height: 64px; border-radius: 16px; margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--secondary), #ff8f5e);
  font-size: 1.8rem;
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); }

/* --- AI Section --- */
.ai-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.ai-image { border-radius: var(--radius); overflow: hidden; }
.ai-list { display: flex; flex-direction: column; gap: 20px; }
.ai-item {
  display: flex; gap: 16px; padding: 20px;
  background: var(--bg-card); border-radius: var(--radius);
  border: 1px solid var(--border-color); transition: all var(--transition);
}
.ai-item:hover { border-color: var(--accent); }
.ai-item-icon {
  width: 48px; height: 48px; min-width: 48px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #00b894);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
}
.ai-item h4 { font-size: 1rem; margin-bottom: 4px; }
.ai-item p { font-size: 0.85rem; color: var(--text-muted); }

/* --- Community Section --- */
.community-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 24px; border: 1px solid var(--border-color);
  transition: all var(--transition); text-align: center;
}
.community-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px var(--shadow-glow);
}
.community-card .emoji { font-size: 2.5rem; margin-bottom: 12px; }
.community-card h4 { font-size: 1rem; margin-bottom: 6px; }
.community-card p { font-size: 0.85rem; color: var(--text-muted); }
.community-card .count { color: var(--secondary); font-weight: 600; font-size: 0.9rem; margin-top: 8px; }

/* --- Expert Section --- */
.expert-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border-color);
  transition: all var(--transition); text-align: center;
}
.expert-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 8px 24px var(--shadow-orange);
}
.expert-avatar {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: #fff; font-weight: 700;
}
.expert-card h4 { font-size: 1.05rem; margin-bottom: 4px; }
.expert-card .role { color: var(--accent); font-size: 0.85rem; margin-bottom: 12px; }
.expert-card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 16px; }
.expert-links { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.expert-links a {
  padding: 6px 16px; border-radius: 50px; font-size: 0.8rem;
  border: 1px solid var(--border-color); color: var(--text-main);
  transition: all var(--transition);
}
.expert-links a:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,212,170,0.05); }

/* --- Reviews --- */
.review-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border-color);
}
.review-stars { color: var(--secondary); font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-card blockquote {
  font-size: 0.92rem; color: var(--text-main); line-height: 1.7;
  margin-bottom: 16px; font-style: italic;
}
.review-author { display: flex; align-items: center; gap: 12px; }
.review-author-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; color: #fff; font-weight: 600;
}
.review-author-info .name { font-size: 0.9rem; font-weight: 600; }
.review-author-info .date { font-size: 0.78rem; color: var(--text-muted); }

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card); border-radius: var(--radius);
  border: 1px solid var(--border-color); overflow: hidden;
}
.faq-question {
  padding: 20px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 0.95rem; color: var(--text-bright);
  transition: background var(--transition);
}
.faq-question:hover { background: rgba(0, 212, 170, 0.04); }
.faq-question .arrow {
  transition: transform var(--transition); font-size: 0.8rem; color: var(--accent);
}
.faq-item.open .faq-question .arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
  padding: 0 24px;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }
.faq-answer p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }

/* --- How-To Guide --- */
.howto-steps {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px; counter-reset: step;
}
.howto-step {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border-color);
  position: relative; counter-increment: step;
}
.howto-step::before {
  content: counter(step); position: absolute; top: -12px; left: 24px;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--secondary); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
}
.howto-step h4 { margin-bottom: 8px; font-size: 1rem; margin-top: 8px; }
.howto-step p { font-size: 0.85rem; color: var(--text-muted); }

/* --- Contact Section --- */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex; gap: 14px; padding: 16px;
  background: var(--bg-card); border-radius: var(--radius);
  border: 1px solid var(--border-color);
}
.contact-item .icon {
  width: 44px; height: 44px; min-width: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--secondary), #ff8f5e);
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.contact-item h4 { font-size: 0.9rem; margin-bottom: 2px; }
.contact-item p { font-size: 0.85rem; color: var(--text-muted); }
.contact-qr { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img { width: 160px; height: 160px; border-radius: var(--radius); margin-bottom: 8px; }
.qr-item p { font-size: 0.85rem; color: var(--text-muted); }

/* --- Share Buttons --- */
.share-bar {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
  padding: 24px 0;
}
.share-btn {
  padding: 10px 20px; border-radius: 50px; font-size: 0.85rem;
  font-weight: 600; border: 1px solid var(--border-color);
  color: var(--text-main); background: var(--bg-card);
  cursor: pointer; transition: all var(--transition);
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }

/* --- Footer --- */
.site-footer {
  background: linear-gradient(180deg, var(--bg-dark), #080812);
  border-top: 1px solid var(--border-color); padding: 48px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 40px;
}
.footer-brand .site-logo { margin-bottom: 12px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }
.footer-col h4 {
  font-size: 0.95rem; margin-bottom: 16px; color: var(--text-bright);
  position: relative; padding-bottom: 8px;
}
.footer-col h4::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 30px; height: 2px; background: var(--accent);
}
.footer-col a {
  display: block; padding: 4px 0; font-size: 0.85rem;
  color: var(--text-muted); transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  text-align: center; padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem; color: var(--text-muted);
}
.footer-bottom .update-time { margin-top: 6px; color: var(--accent); }

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 16px 0; font-size: 0.85rem; color: var(--text-muted);
  margin-top: 68px;
}
.breadcrumb a { color: var(--accent); }
.breadcrumb span { margin: 0 8px; }

/* --- Inner Page Hero --- */
.inner-hero {
  padding: 100px 0 48px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  text-align: center;
}
.inner-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.inner-hero p { color: var(--text-muted); font-size: 1rem; }

/* --- Partner Logos --- */
.partner-wall {
  display: flex; flex-wrap: wrap; gap: 24px;
  justify-content: center; align-items: center;
}
.partner-item {
  width: 140px; height: 80px; background: var(--bg-card);
  border-radius: var(--radius-sm); border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: var(--text-muted); font-weight: 600;
  transition: all var(--transition);
}
.partner-item:hover { border-color: var(--accent); color: var(--accent); }

/* --- MCP Service Frontend --- */
.mcp-panel {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 24px; border: 1px solid var(--border-color);
  margin-top: 24px;
}
.mcp-panel h4 { margin-bottom: 12px; font-size: 1rem; }
.mcp-status { display: flex; gap: 12px; flex-wrap: wrap; }
.mcp-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); display: inline-block;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav {
    position: fixed; top: 68px; left: 0; width: 100%;
    background: rgba(13, 13, 26, 0.98);
    flex-direction: column; padding: 20px;
    transform: translateY(-120%); transition: transform var(--transition);
    border-bottom: 1px solid var(--border-color);
  }
  .main-nav.open { transform: translateY(0); }
  .nav-toggle { display: block; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-banner { min-height: 400px; }
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.5rem; }
  .btn { padding: 12px 24px; font-size: 0.85rem; }
  .search-wrap { flex-direction: column; border-radius: var(--radius); }
  .search-wrap button { border-radius: 0; }
}

/* --- Lazy Load --- */
img[loading="lazy"] { opacity: 0; transition: opacity 0.5s; }
img[loading="lazy"].loaded, img[loading="lazy"][src] { opacity: 1; }

/* --- Utility --- */
.text-accent { color: var(--accent); }
.text-orange { color: var(--secondary); }
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}