/* ===== CSS Variables - AIGoMoon Theme ===== */
:root {
  --primary: #4A90D9;
  --primary-dark: #2E6BB5;
  --primary-light: #7BB8E8;
  --accent: #06B6D4;
  --accent-light: #67E8F9;
  --warm: #F59E0B;
  --warm-light: #FCD34D;
  --dark: #1E3A5F;
  --dark-2: #2C3E50;
  --text: #1E293B;
  --text-light: #64748B;
  --text-lighter: #94A3B8;
  --bg: #f5f6f8;
  --bg-soft: #f0f2f5;
  --bg-card: #FFFFFF;
  --border: #e8eaed;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --radius-sm: 10px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --header-height: 72px;
  --max-width: 1280px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* ===== Layout ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
main { min-height: calc(100vh - var(--header-height) - 200px); padding-top: var(--header-height); }

/* ===== Header / Navigation ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-wrap img { height: 52px; width: 52px; object-fit: contain; }
.logo-text { font-size: 1.25rem; font-weight: 800; color: var(--dark); letter-spacing: -0.5px; }
.logo-text span { color: var(--primary); }

.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: center; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--text-light);
  transition: var(--transition); white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: rgba(74,144,217,0.08); }

.header-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.lang-switch {
  display: flex; align-items: center; gap: 4px;
  padding: 6px 12px; border-radius: 20px;
  background: var(--bg-soft); border: 1px solid var(--border);
  font-size: 0.8rem; font-weight: 600; color: var(--text-light);
  transition: var(--transition);
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); }
.lang-switch .active-lang { color: var(--primary); }

.mobile-menu-btn {
  display: none; width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-sm); color: var(--dark);
}
.mobile-menu-btn span { display: block; width: 22px; height: 2px; background: var(--dark); position: relative; transition: var(--transition); }
.mobile-menu-btn span::before, .mobile-menu-btn span::after {
  content: ''; position: absolute; left: 0; width: 22px; height: 2px; background: var(--dark); transition: var(--transition);
}
.mobile-menu-btn span::before { top: -7px; }
.mobile-menu-btn span::after { top: 7px; }

/* ===== Footer ===== */
.site-footer {
  background: var(--dark); color: rgba(255,255,255,0.7);
  padding: 60px 0 30px; margin-top: 80px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px;
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.footer-brand .logo-text { color: #fff; font-size: 1.4rem; margin-bottom: 12px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 18px; font-weight: 600; }
.footer-col a {
  display: block; padding: 5px 0; font-size: 0.88rem;
  color: rgba(255,255,255,0.6); transition: var(--transition);
}
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom {
  max-width: var(--max-width); margin: 40px auto 0; padding: 24px 24px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.82rem; color: rgba(255,255,255,0.4);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f0f5fa 60%, #e8eff7 100%);
  color: var(--dark); padding: 72px 0 88px; text-align: center;
  position: relative; overflow: hidden;
  border-radius: 0 0 36px 36px;
  margin: 0 12px;
  box-shadow: 0 4px 20px rgba(74,144,217,0.08);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 15% 30%, rgba(74,144,217,0.08) 0%, transparent 45%),
              radial-gradient(circle at 85% 20%, rgba(6,182,212,0.08) 0%, transparent 40%),
              radial-gradient(circle at 50% 90%, rgba(245,158,11,0.06) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; max-width: 680px; margin: 0 auto; padding: 0 24px; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; margin-bottom: 16px; letter-spacing: -1px;
  background: linear-gradient(135deg, #1E3A5F 0%, #2E6BB5 60%, #06B6D4 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { font-size: clamp(1rem, 2vw, 1.15rem); color: var(--text-light); margin-bottom: 32px; line-height: 1.7; }
.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; background: var(--primary); color: #fff;
  border-radius: 30px; font-weight: 700; font-size: 1rem;
  transition: var(--transition); box-shadow: 0 4px 18px rgba(74,144,217,0.35);
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 26px rgba(74,144,217,0.45); background: var(--primary-dark); }

/* ===== Section ===== */
.section { padding: 56px 0; }
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 28px;
}
.section-title {
  font-size: 1.55rem; font-weight: 800; color: var(--dark);
  display: flex; align-items: center; gap: 12px;
}
.section-title::before {
  content: ''; width: 4px; height: 26px; border-radius: 2px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
}
.section-more {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.92rem; font-weight: 600; color: var(--primary);
  transition: var(--transition);
}
.section-more:hover { color: var(--primary-dark); gap: 10px; }

/* ===== Card Grid ===== */
.card-grid {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
}
.card {
  background: var(--bg-card); border-radius: var(--radius-md);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: var(--transition); cursor: pointer;
  border: 1px solid rgba(0,0,0,0.04);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: rgba(74,144,217,0.15); }
.card-thumb {
  width: 100%; aspect-ratio: 16/9; overflow: hidden; background: var(--bg-soft);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.card:hover .card-thumb img { transform: scale(1.04); }
.card-body { padding: 20px 22px 24px; }
.card-category {
  display: inline-block; padding: 5px 14px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 700; margin-bottom: 12px;
  background: rgba(74,144,217,0.1); color: var(--primary);
  letter-spacing: 0.3px;
}
/* Category-specific tag colors */
.card[data-cat="frontier"] .card-category { background: rgba(74,144,217,0.12); color: #2E6BB5; }
.card[data-cat="reviews"] .card-category { background: rgba(245,158,11,0.12); color: #D97706; }
.card[data-cat="tutorials"] .card-category { background: rgba(16,185,129,0.12); color: #059669; }
.card[data-cat="hands-on"] .card-category { background: rgba(139,92,246,0.12); color: #7C3AED; }
.card[data-cat="toolkit"] .card-category { background: rgba(6,182,212,0.12); color: #0891B2; }
.card[data-cat="music"] .card-category { background: rgba(236,72,153,0.12); color: #DB2777; }
.card[data-cat="art"] .card-category { background: rgba(249,115,22,0.12); color: #EA580C; }
.card[data-cat="games"] .card-category { background: rgba(99,102,241,0.12); color: #4F46E5; }
.card-title {
  font-size: 1.08rem; font-weight: 700; color: var(--text);
  margin-bottom: 10px; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-desc {
  font-size: 0.9rem; color: var(--text-light); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border);
  font-size: 0.8rem; color: var(--text-lighter);
}
.card-meta .views { display: flex; align-items: center; gap: 4px; }

/* ===== Category Page ===== */
.page-header {
  background: transparent; padding: 48px 0 28px;
}
.page-header h1 { font-size: 1.9rem; font-weight: 800; color: var(--dark); margin-bottom: 8px; }
.page-header p { color: var(--text-light); font-size: 1rem; }

.sort-bar {
  display: flex; align-items: center; gap: 10px; margin-bottom: 28px;
}
.sort-btn {
  padding: 9px 22px; border-radius: 24px; font-size: 0.88rem; font-weight: 600;
  color: var(--text-light); background: var(--bg-card); border: 1px solid var(--border);
  transition: var(--transition); box-shadow: var(--shadow-sm);
}
.sort-btn:hover { border-color: var(--primary-light); }
.sort-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 2px 10px rgba(74,144,217,0.3); }

/* ===== Detail Page ===== */
.detail-article { max-width: 800px; margin: 0 auto; padding: 40px 24px 60px; }
.detail-header { margin-bottom: 36px; }
.detail-category {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 700; margin-bottom: 18px;
  background: rgba(74,144,217,0.1); color: var(--primary);
}
.detail-title { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 800; color: var(--dark); line-height: 1.3; margin-bottom: 16px; }
.detail-meta {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  font-size: 0.88rem; color: var(--text-light);
}
.detail-cover {
  width: 100%; border-radius: var(--radius-lg); overflow: hidden;
  margin-bottom: 36px; box-shadow: var(--shadow-md);
}
.detail-cover img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.detail-content { font-size: 1.05rem; line-height: 1.85; color: var(--text); }
.detail-content h2 { font-size: 1.5rem; font-weight: 700; color: var(--dark); margin: 36px 0 16px; }
.detail-content h3 { font-size: 1.2rem; font-weight: 600; color: var(--dark); margin: 28px 0 12px; }
.detail-content p { margin-bottom: 18px; }
.detail-content ul, .detail-content ol { margin: 16px 0; padding-left: 24px; }
.detail-content li { margin-bottom: 8px; }
.detail-content code {
  background: var(--bg-soft); padding: 2px 8px; border-radius: 4px;
  font-size: 0.9em; color: var(--primary-dark);
}
.detail-content pre {
  background: var(--dark); color: #e2e8f0; padding: 20px; border-radius: var(--radius-md);
  overflow-x: auto; margin: 20px 0; font-size: 0.9rem;
}
.detail-content blockquote {
  border-left: 4px solid var(--primary); padding: 12px 20px;
  background: var(--bg-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0; color: var(--text-light);
}

.detail-actions {
  display: flex; align-items: center; gap: 14px; margin-top: 48px;
  padding-top: 28px; border-top: 1px solid var(--border);
}
.fav-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 26px; border-radius: 26px;
  font-size: 0.9rem; font-weight: 600;
  border: 1px solid var(--border); color: var(--text-light);
  transition: var(--transition); background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}
.fav-btn:hover { border-color: var(--warm); color: var(--warm); }
.fav-btn.active { background: var(--warm); color: #fff; border-color: var(--warm); box-shadow: 0 2px 12px rgba(245,158,11,0.3); }
.share-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 26px; border-radius: 26px;
  font-size: 0.9rem; font-weight: 600;
  background: var(--bg-card); color: var(--text-light); transition: var(--transition);
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.share-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== Template Page ===== */
.template-main { padding: 40px 24px 60px; max-width: var(--max-width); margin: 0 auto; }
.template-placeholder {
  border: 2px dashed var(--border); border-radius: var(--radius-lg);
  padding: 80px 40px; text-align: center; color: var(--text-lighter);
}
.template-placeholder h2 { font-size: 1.4rem; margin-bottom: 12px; color: var(--text-light); }

/* ===== Loading ===== */
.loading { text-align: center; padding: 60px; color: var(--text-lighter); }
.loading-spinner {
  display: inline-block; width: 36px; height: 36px;
  border: 3px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(100px);
  background: var(--dark); color: #fff; padding: 12px 28px; border-radius: 24px;
  font-size: 0.9rem; font-weight: 500; z-index: 9999;
  transition: transform 0.3s ease; box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .main-nav { gap: 0; }
  .main-nav a { padding: 8px 10px; font-size: 0.85rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }
  .main-nav {
    position: fixed; top: var(--header-height); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 12px 20px; max-height: 0; overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    box-shadow: var(--shadow-md);
  }
  .main-nav.open { max-height: 520px; padding: 16px 20px; }
  .main-nav a { padding: 13px 16px; border-radius: var(--radius-sm); font-size: 0.95rem; }
  .mobile-menu-btn { display: flex; }
  .logo-text { font-size: 1rem; }
  .logo-wrap img { width: 40px; height: 40px; }
  .hero { padding: 48px 0 56px; margin: 0 8px; border-radius: 0 0 28px 28px; }
  .section { padding: 40px 0; }
  .section-title { font-size: 1.3rem; }
  .card-grid { grid-template-columns: 1fr; gap: 18px; }
  .card-body { padding: 18px 20px 22px; }
  .card-title { font-size: 1rem; }
  .card-desc { font-size: 0.88rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
  .detail-article { padding: 24px 16px 40px; }
  .page-header { padding: 32px 0 20px; }
  .page-header h1 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
  .header-inner { padding: 0 16px; }
}

/* ===== Ad Spaces ===== */
.ad-space {
  width: 100%;
  margin: 32px auto;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
  overflow: hidden;
}
.ad-space .ad-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
  opacity: 0.6;
  margin-bottom: 10px;
}
.ad-space > div {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 90px;
}
.ad-native {
  max-width: 728px;
}
.ad-inline {
  max-width: 100%;
  margin: 28px 0;
}
.footer-smartlink {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-smartlink a {
  color: rgba(255,255,255,0.5) !important;
  font-size: 0.82rem !important;
  text-decoration: none;
  transition: color 0.2s;
}
.footer-smartlink a:hover {
  color: var(--cyan) !important;
}
@media (max-width: 768px) {
  .ad-space { margin: 20px auto; padding: 12px; }
  .ad-native { max-width: 100%; }
}