/* ============================================
   海角社区 - 原创CSS样式表
   品牌色系：深海蓝黑 + 珊瑚红
   zofu.net.cn
   ============================================ */

/* CSS Variables */
:root {
  --primary: #1a1a2e;
  --secondary: #e94560;
  --accent: #0f3460;
  --bg-dark: #16213e;
  --bg-darker: #0a0a1a;
  --text-light: #eaeaea;
  --text-muted: #a0a0b8;
  --text-white: #ffffff;
  --gradient-main: linear-gradient(135deg, #e94560 0%, #0f3460 100%);
  --gradient-dark: linear-gradient(180deg, #1a1a2e 0%, #0a0a1a 100%);
  --gradient-card: linear-gradient(145deg, #1e1e38 0%, #16213e 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-darker);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
a:hover { color: #ff6b81; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 20px; }

/* ============ Header & Navigation ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 10, 26, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(233, 69, 96, 0.15);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-link img { height: 42px; width: auto; }
.logo-text { font-size: 1.3rem; font-weight: 800; color: var(--text-white); letter-spacing: 1px; }
.logo-text span { color: var(--secondary); }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 16px;
  font-size: 0.95rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-white);
  background: rgba(233, 69, 96, 0.15);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: var(--transition);
}

/* Search Bar */
.search-bar {
  background: rgba(22, 33, 62, 0.8);
  border-bottom: 1px solid rgba(233, 69, 96, 0.1);
  padding: 10px 0;
  margin-top: 68px;
}
.search-wrapper {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}
.search-wrapper input {
  width: 100%;
  padding: 12px 50px 12px 20px;
  background: rgba(26, 26, 46, 0.9);
  border: 1px solid rgba(233, 69, 96, 0.25);
  border-radius: 30px;
  color: var(--text-light);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-wrapper input:focus {
  border-color: var(--secondary);
  box-shadow: 0 0 20px rgba(233, 69, 96, 0.15);
}
.search-wrapper input::placeholder { color: var(--text-muted); }
.search-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--gradient-main);
  border: none;
  color: white;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.search-btn:hover { transform: translateY(-50%) scale(1.08); }

/* ============ Hero Section ============ */
.hero-section {
  position: relative;
  min-height: 75vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-darker);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,26,0.6) 0%, rgba(10,10,26,0.95) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 20px 60px;
  max-width: 900px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  background: rgba(233, 69, 96, 0.15);
  border: 1px solid rgba(233, 69, 96, 0.3);
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--secondary);
  margin-bottom: 24px;
  letter-spacing: 2px;
}
.hero-content h1 {
  font-size: 3rem;
  color: var(--text-white);
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero-content h1 span { color: var(--secondary); }
.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-main);
  color: white;
  box-shadow: 0 4px 20px rgba(233, 69, 96, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(233, 69, 96, 0.45);
  color: white;
}
.btn-outline {
  background: transparent;
  color: var(--text-light);
  border: 2px solid rgba(233, 69, 96, 0.4);
}
.btn-outline:hover {
  background: rgba(233, 69, 96, 0.1);
  border-color: var(--secondary);
  color: white;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--secondary);
  display: block;
}
.hero-stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ============ Section Common ============ */
.section {
  padding: 80px 0;
  position: relative;
}
.section-alt { background: var(--bg-dark); }
.section-header {
  text-align: center;
  margin-bottom: 50px;
}
.section-header h2 {
  font-size: 2.2rem;
  color: var(--text-white);
  margin-bottom: 12px;
}
.section-header h2 span { color: var(--secondary); }
.section-header p {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}
.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--secondary);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* ============ Video Card ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.2);
}
.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: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(233, 69, 96, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  z-index: 2;
}
.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent white;
  margin-left: 3px;
}
.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  z-index: 2;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.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-tag {
  padding: 3px 10px;
  background: rgba(233, 69, 96, 0.1);
  border: 1px solid rgba(233, 69, 96, 0.2);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--secondary);
}

/* ============ Feature Grid ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(233, 69, 96, 0.25);
  box-shadow: var(--shadow-md);
}
.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--gradient-main);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}
.feature-card h3 {
  font-size: 1.15rem;
  color: var(--text-white);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============ Star Card ============ */
.star-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.star-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.star-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.star-card img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  transition: var(--transition);
}
.star-card:hover img { transform: scale(1.05); }
.star-card-body { padding: 16px; text-align: center; }
.star-card-body h3 { font-size: 1.1rem; color: var(--text-white); margin-bottom: 6px; }
.star-card-body p { font-size: 0.85rem; color: var(--text-muted); }

/* ============ Expert Section ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: var(--transition);
}
.expert-card:hover {
  border-color: rgba(233, 69, 96, 0.2);
  box-shadow: var(--shadow-md);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--secondary);
  flex-shrink: 0;
}
.expert-info h3 { font-size: 1.1rem; color: var(--text-white); margin-bottom: 4px; }
.expert-title { font-size: 0.85rem; color: var(--secondary); margin-bottom: 8px; }
.expert-desc { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 12px; }
.expert-actions { display: flex; gap: 10px; }
.btn-sm {
  padding: 6px 16px;
  font-size: 0.82rem;
  border-radius: 20px;
}

/* ============ FAQ Section ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-white);
  transition: var(--transition);
}
.faq-question:hover { color: var(--secondary); }
.faq-arrow {
  transition: var(--transition);
  font-size: 1.2rem;
  color: var(--secondary);
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; }

/* ============ Review Section ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(233, 69, 96, 0.2); }
.review-stars { color: #ffc107; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1rem;
}
.review-name { font-size: 0.9rem; color: var(--text-white); font-weight: 600; }
.review-date { font-size: 0.78rem; color: var(--text-muted); }

/* ============ Partner Section ============ */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  align-items: center;
}
.partner-item {
  padding: 16px 28px;
  background: rgba(26, 26, 46, 0.6);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 600;
  transition: var(--transition);
}
.partner-item:hover {
  border-color: rgba(233, 69, 96, 0.3);
  color: var(--text-white);
}

/* ============ Contact Section ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
}
.contact-card h4 {
  color: var(--text-white);
  margin-bottom: 12px;
  font-size: 1.1rem;
}
.contact-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}
.contact-card img {
  width: 140px;
  height: 140px;
  margin: 12px auto 0;
  border-radius: var(--radius-sm);
}

/* ============ Social Share ============ */
.share-bar {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 24px 0;
}
.share-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: white;
  transition: var(--transition);
  cursor: pointer;
}
.share-btn:hover { transform: translateY(-3px); }
.share-wechat { background: #07c160; }
.share-weibo { background: #e6162d; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; }

/* ============ Footer ============ */
.site-footer {
  background: var(--primary);
  border-top: 1px solid rgba(233, 69, 96, 0.15);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 16px 0;
  line-height: 1.7;
}
.footer-col h4 {
  color: var(--text-white);
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--secondary);
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.88rem;
  padding: 4px 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--secondary); padding-left: 4px; }
.footer-qr { display: flex; gap: 16px; margin-top: 12px; }
.footer-qr img { width: 100px; height: 100px; border-radius: var(--radius-sm); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 68px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb span { margin: 0 8px; }

/* ============ Inner Page ============ */
.page-hero {
  padding: 100px 0 50px;
  text-align: center;
  background: var(--gradient-dark);
  margin-top: 68px;
}
.page-hero h1 { font-size: 2.4rem; color: var(--text-white); margin-bottom: 12px; }
.page-hero p { color: var(--text-muted); font-size: 1.05rem; }

.content-section { padding: 60px 0; }
.content-section h2 { font-size: 1.8rem; color: var(--text-white); margin-bottom: 20px; }
.content-section h3 { font-size: 1.4rem; color: var(--text-white); margin-bottom: 14px; }
.content-section p { color: var(--text-muted); margin-bottom: 16px; line-height: 1.8; }

/* ============ How-To Guide ============ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: var(--gradient-card);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -12px;
  left: 20px;
  width: 32px;
  height: 32px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
}
.howto-step h4 { color: var(--text-white); margin-bottom: 8px; font-size: 1.05rem; }
.howto-step p { color: var(--text-muted); font-size: 0.9rem; }

/* ============ Scroll to Top ============ */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: var(--shadow-md);
}
.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover { transform: translateY(-3px); }

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

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-content h1 { font-size: 2.4rem; }
  .expert-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 26, 0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    transform: translateY(-120%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(233, 69, 96, 0.15);
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { width: 100%; padding: 12px 16px; }
  .mobile-toggle { display: flex; }
  
  .hero-content h1 { font-size: 1.8rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat-num { font-size: 1.5rem; }
  
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.6rem; }
  
  .video-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .star-grid { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  
  .expert-card { flex-direction: column; align-items: center; text-align: center; }
}

@media (max-width: 480px) {
  .feature-grid { grid-template-columns: 1fr; }
  .star-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .howto-steps { grid-template-columns: 1fr; }
}