/* 媚黑视频社区 - 冰雪植物主题 CSS */
/* 原创配色：冰川蓝 #1a3a5c | 雪松绿 #2d7a4f | 雪原白 #f0f5f9 | 暖阳橙 #e8913a | 冰晶紫 #6b4c9a */

:root {
  --glacier-blue: #1a3a5c;
  --pine-green: #2d7a4f;
  --snow-white: #f0f5f9;
  --warm-orange: #e8913a;
  --ice-purple: #6b4c9a;
  --deep-navy: #0d1f33;
  --soft-gray: #e2e8f0;
  --text-dark: #1e293b;
  --text-mid: #475569;
  --text-light: #94a3b8;
  --card-shadow: 0 4px 20px rgba(26,58,92,0.08);
  --hover-shadow: 0 8px 32px rgba(26,58,92,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

* { 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; color: var(--text-dark); background: #fff; line-height: 1.7; }
a { color: var(--pine-green); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--warm-orange); }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: var(--glacier-blue); position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 12px rgba(0,0,0,0.15); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-img { width: 42px; height: 42px; border-radius: 50%; border: 2px solid var(--pine-green); }
.logo-text { font-size: 1.6rem; font-weight: 800; color: #fff; letter-spacing: 1px; }
.main-nav { display: flex; gap: 6px; }
.nav-item { color: rgba(255,255,255,0.85); padding: 8px 16px; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 500; transition: var(--transition); }
.nav-item:hover, .nav-item.active { background: rgba(255,255,255,0.15); color: #fff; }
.mobile-menu-btn { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; padding: 8px; }

/* Search Bar */
.search-bar { background: var(--snow-white); padding: 16px 0; border-bottom: 1px solid var(--soft-gray); }
.search-wrap { display: flex; max-width: 680px; margin: 0 auto; }
.search-input { flex: 1; padding: 12px 20px; border: 2px solid var(--soft-gray); border-right: none; border-radius: var(--radius) 0 0 var(--radius); font-size: 0.95rem; outline: none; transition: var(--transition); }
.search-input:focus { border-color: var(--pine-green); }
.search-btn { padding: 12px 28px; background: var(--pine-green); color: #fff; border: 2px solid var(--pine-green); border-radius: 0 var(--radius) var(--radius) 0; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition); }
.search-btn:hover { background: #236b3f; }

/* Hero Section */
.hero-section { position: relative; min-height: 520px; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; background-repeat: no-repeat; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(13,31,51,0.82) 0%, rgba(26,58,92,0.65) 50%, rgba(45,122,79,0.5) 100%); }
.hero-content { position: relative; z-index: 2; color: #fff; padding: 60px 0; }
.hero-content h1 { font-size: 2.6rem; font-weight: 800; margin-bottom: 18px; line-height: 1.3; text-shadow: 0 2px 8px rgba(0,0,0,0.3); }
.hero-desc { font-size: 1.1rem; line-height: 1.8; max-width: 720px; margin-bottom: 28px; opacity: 0.95; }
.hero-btns { display: flex; gap: 16px; margin-bottom: 36px; flex-wrap: wrap; }
.btn-primary { display: inline-block; padding: 13px 32px; background: var(--pine-green); color: #fff; border-radius: var(--radius); font-weight: 600; font-size: 1rem; transition: var(--transition); border: 2px solid var(--pine-green); }
.btn-primary:hover { background: #236b3f; color: #fff; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(45,122,79,0.35); }
.btn-secondary { display: inline-block; padding: 13px 32px; background: transparent; color: #fff; border-radius: var(--radius); font-weight: 600; font-size: 1rem; border: 2px solid rgba(255,255,255,0.6); transition: var(--transition); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); color: #fff; border-color: #fff; }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--warm-orange); }
.stat-label { font-size: 0.85rem; opacity: 0.85; }

/* Sections */
.section { padding: 70px 0; }
.section-alt { background: var(--snow-white); }
.section-title { font-size: 2rem; font-weight: 800; text-align: center; margin-bottom: 14px; color: var(--glacier-blue); }
.section-title.align-left { text-align: left; }
.section-desc { text-align: center; color: var(--text-mid); max-width: 760px; margin: 0 auto 40px; font-size: 1rem; line-height: 1.8; }
.section-more { text-align: center; margin-top: 32px; }
.section-more a { display: inline-block; padding: 10px 28px; border: 2px solid var(--pine-green); color: var(--pine-green); border-radius: var(--radius); font-weight: 600; transition: var(--transition); }
.section-more a:hover { background: var(--pine-green); color: #fff; }

/* Video Grid */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.video-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--card-shadow); transition: var(--transition); }
.video-card:hover { transform: translateY(-6px); box-shadow: var(--hover-shadow); }
.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 ease; }
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 56px; height: 56px; background: rgba(45,122,79,0.9); border-radius: 50%; opacity: 0; transition: var(--transition); }
.play-btn::after { content: ''; position: absolute; top: 50%; left: 54%; transform: translate(-50%, -50%); border-style: solid; border-width: 10px 0 10px 18px; border-color: transparent transparent transparent #fff; }
.video-card:hover .play-btn { opacity: 1; }
.video-duration { position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.75); color: #fff; padding: 2px 8px; border-radius: 4px; font-size: 0.8rem; }
.video-tag { position: absolute; top: 8px; left: 8px; background: var(--warm-orange); color: #fff; padding: 3px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.video-info { padding: 16px; }
.video-info h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; line-height: 1.5; color: var(--text-dark); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; gap: 12px; font-size: 0.8rem; color: var(--text-light); }

/* Service Grid */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card { background: #fff; border-radius: var(--radius); padding: 32px 24px; text-align: center; box-shadow: var(--card-shadow); transition: var(--transition); border-top: 3px solid transparent; }
.service-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); border-top-color: var(--pine-green); }
.service-icon { font-size: 2.5rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1.1rem; color: var(--glacier-blue); margin-bottom: 12px; }
.service-card p { font-size: 0.9rem; color: var(--text-mid); line-height: 1.7; margin-bottom: 16px; }
.service-link { color: var(--pine-green); font-weight: 600; font-size: 0.9rem; }

/* Entertainment Grid */
.entertain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.entertain-card { background: #fff; border-radius: var(--radius); padding: 28px 20px; box-shadow: var(--card-shadow); transition: var(--transition); border-left: 4px solid var(--ice-purple); }
.entertain-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.entertain-icon { font-size: 2rem; margin-bottom: 12px; }
.entertain-card h4 { font-size: 1rem; color: var(--glacier-blue); margin-bottom: 10px; }
.entertain-card p { font-size: 0.88rem; color: var(--text-mid); line-height: 1.7; }

/* AI Section */
.ai-section-wrap { display: flex; gap: 48px; align-items: center; }
.ai-text { flex: 1; }
.ai-text p { color: var(--text-mid); line-height: 1.8; margin-bottom: 20px; }
.ai-features { list-style: none; margin-bottom: 24px; }
.ai-features li { padding: 8px 0; padding-left: 24px; position: relative; color: var(--text-mid); line-height: 1.7; font-size: 0.95rem; }
.ai-features li::before { content: '✓'; position: absolute; left: 0; color: var(--pine-green); font-weight: 700; }
.ai-features li strong { color: var(--glacier-blue); }
.ai-image { flex: 0 0 45%; }
.ai-image img { border-radius: var(--radius); box-shadow: var(--card-shadow); }

/* Community Grid */
.community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 32px; }
.community-card { background: #fff; border-radius: var(--radius); padding: 28px 20px; box-shadow: var(--card-shadow); transition: var(--transition); text-align: center; }
.community-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.community-icon { font-size: 2.2rem; margin-bottom: 12px; }
.community-card h4 { font-size: 1rem; color: var(--glacier-blue); margin-bottom: 10px; }
.community-card p { font-size: 0.88rem; color: var(--text-mid); line-height: 1.7; }
.community-banner { border-radius: var(--radius); overflow: hidden; box-shadow: var(--card-shadow); }
.community-banner img { width: 100%; height: 280px; object-fit: cover; }

/* Tutorial Grid */
.tutorial-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.tutorial-card { background: #fff; border-radius: var(--radius); padding: 28px; box-shadow: var(--card-shadow); transition: var(--transition); }
.tutorial-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.tutorial-card h4 { font-size: 1.05rem; color: var(--glacier-blue); margin-bottom: 10px; }
.tutorial-card p { font-size: 0.9rem; color: var(--text-mid); line-height: 1.7; margin-bottom: 14px; }
.tutorial-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tutorial-tag { background: var(--snow-white); color: var(--pine-green); padding: 4px 12px; border-radius: 20px; font-size: 0.78rem; font-weight: 500; border: 1px solid rgba(45,122,79,0.2); }

/* Expert Grid */
.expert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.expert-card { background: #fff; border-radius: var(--radius); padding: 28px; text-align: center; box-shadow: var(--card-shadow); transition: var(--transition); }
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.expert-avatar { width: 100px; height: 100px; border-radius: 50%; object-fit: cover; margin: 0 auto 16px; border: 3px solid var(--pine-green); }
.expert-avatar-placeholder { width: 100px; height: 100px; border-radius: 50%; background: linear-gradient(135deg, var(--glacier-blue), var(--pine-green)); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 2.2rem; color: #fff; line-height: 100px; text-align: center; }
.expert-title { font-size: 1rem; color: var(--glacier-blue); margin-bottom: 10px; }
.expert-desc { font-size: 0.88rem; color: var(--text-mid); line-height: 1.7; margin-bottom: 12px; }
.expert-awards { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; margin-bottom: 14px; }
.award-tag { background: rgba(232,145,58,0.1); color: var(--warm-orange); padding: 3px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 500; }
.expert-actions { display: flex; gap: 8px; justify-content: center; }
.btn-small { padding: 6px 16px; background: var(--pine-green); color: #fff; border-radius: var(--radius-sm); font-size: 0.82rem; font-weight: 500; transition: var(--transition); }
.btn-small:hover { background: #236b3f; color: #fff; }
.btn-small-outline { padding: 6px 16px; border: 1px solid var(--pine-green); color: var(--pine-green); border-radius: var(--radius-sm); font-size: 0.82rem; font-weight: 500; transition: var(--transition); }
.btn-small-outline:hover { background: var(--pine-green); color: #fff; }

/* Credential Grid */
.credential-grid { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.credential-item { text-align: center; padding: 20px; }
.credential-icon { font-size: 2.5rem; margin-bottom: 10px; }
.credential-item p { font-size: 0.9rem; color: var(--text-mid); font-weight: 500; }

/* Partner Grid */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.partner-item { background: var(--snow-white); border-radius: var(--radius-sm); padding: 20px 12px; text-align: center; border: 1px solid var(--soft-gray); transition: var(--transition); }
.partner-item:hover { border-color: var(--pine-green); box-shadow: var(--card-shadow); }
.partner-item span { font-size: 0.85rem; color: var(--text-mid); font-weight: 500; }

/* Steps Grid */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card { background: #fff; border-radius: var(--radius); padding: 32px 24px; text-align: center; box-shadow: var(--card-shadow); transition: var(--transition); position: relative; }
.step-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.step-num { font-size: 2.5rem; font-weight: 900; color: rgba(45,122,79,0.15); margin-bottom: 12px; }
.step-card h4 { font-size: 1.05rem; color: var(--glacier-blue); margin-bottom: 10px; }
.step-card p { font-size: 0.88rem; color: var(--text-mid); line-height: 1.7; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--soft-gray); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; background: #fff; }
.faq-question { display: flex; justify-content: space-between; align-items: center; padding: 18px 24px; cursor: pointer; transition: var(--transition); }
.faq-question:hover { background: var(--snow-white); }
.faq-question h3 { font-size: 1rem; font-weight: 600; color: var(--glacier-blue); }
.faq-toggle { font-size: 1.4rem; color: var(--pine-green); font-weight: 700; transition: transform 0.3s ease; }
.faq-item.active .faq-toggle { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer p { padding: 0 24px 18px; color: var(--text-mid); line-height: 1.8; font-size: 0.95rem; }

/* Review Grid */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card { background: #fff; border-radius: var(--radius); padding: 28px; box-shadow: var(--card-shadow); transition: var(--transition); }
.review-card:hover { transform: translateY(-4px); box-shadow: var(--hover-shadow); }
.review-stars { color: var(--warm-orange); font-size: 1.1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.92rem; color: var(--text-mid); line-height: 1.8; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; flex-direction: column; }
.author-name { font-weight: 700; color: var(--glacier-blue); font-size: 0.9rem; }
.author-info { font-size: 0.8rem; color: var(--text-light); }

/* Share Buttons */
.share-buttons { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.share-btn { padding: 12px 28px; border: none; border-radius: var(--radius); font-size: 0.95rem; font-weight: 600; color: #fff; cursor: pointer; transition: var(--transition); }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; }
.share-bilibili { background: #00a1d6; }

/* Contact Grid */
.contact-grid { display: flex; gap: 48px; align-items: flex-start; }
.contact-info { flex: 1; }
.contact-info h4 { font-size: 1.3rem; color: var(--glacier-blue); margin-bottom: 20px; }
.contact-info h5 { font-size: 1.1rem; color: var(--glacier-blue); margin: 20px 0 12px; }
.contact-item { padding: 8px 0; color: var(--text-mid); font-size: 0.95rem; border-bottom: 1px solid var(--soft-gray); }
.contact-qr { display: flex; gap: 24px; }
.qr-item { text-align: center; }
.qr-item img { width: 160px; height: 160px; border-radius: var(--radius-sm); border: 2px solid var(--soft-gray); }
.qr-item p { margin-top: 8px; font-size: 0.85rem; color: var(--text-mid); font-weight: 500; }

/* Footer */
.site-footer { background: var(--deep-navy); color: rgba(255,255,255,0.8); padding: 48px 0 0; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand img { width: 36px; height: 36px; border-radius: 50%; }
.footer-brand span { font-size: 1.2rem; font-weight: 700; color: #fff; }
.footer-col p { font-size: 0.88rem; line-height: 1.7; opacity: 0.8; }
.footer-col h5 { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a, .footer-links span { color: rgba(255,255,255,0.7); font-size: 0.88rem; transition: var(--transition); }
.footer-links a:hover { color: var(--warm-orange); }
.footer-bottom { text-align: center; padding: 20px 0; font-size: 0.82rem; opacity: 0.7; }
.footer-bottom p { margin-bottom: 4px; }
.footer-bottom a { color: rgba(255,255,255,0.8); }
.footer-bottom a:hover { color: var(--warm-orange); }

/* Breadcrumb */
.breadcrumb { padding: 14px 0; background: var(--snow-white); border-bottom: 1px solid var(--soft-gray); }
.breadcrumb-list { display: flex; align-items: center; gap: 8px; list-style: none; font-size: 0.88rem; }
.breadcrumb-list a { color: var(--pine-green); }
.breadcrumb-list span { color: var(--text-light); }

/* Page Header */
.page-header { background: linear-gradient(135deg, var(--glacier-blue), var(--pine-green)); color: #fff; padding: 48px 0; text-align: center; }
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { font-size: 1.05rem; opacity: 0.9; max-width: 600px; margin: 0 auto; }

/* Responsive */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .entertain-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .ai-section-wrap { flex-direction: column; }
  .ai-image { flex: none; }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; background: var(--glacier-blue); flex-direction: column; padding: 16px; gap: 4px; box-shadow: 0 4px 20px rgba(0,0,0,0.2); z-index: 999; }
  .main-nav.open { display: flex; }
  .mobile-menu-btn { display: block; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 1.4rem; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.6rem; }
  .video-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .entertain-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { flex-direction: column; }
  .contact-qr { justify-content: center; }
  .footer-top { grid-template-columns: 1fr; }
  .share-buttons { flex-direction: column; align-items: center; }
  .page-header h1 { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-secondary { text-align: center; }
  .hero-stats { flex-direction: column; gap: 12px; }
  .partner-grid { grid-template-columns: 1fr; }
}