:root {
  --theme-bg: #090d16;
  --theme-surface: #111827;
  --theme-card: #182238;
  --theme-card-hover: #202d4a;
  --theme-text: #f9fafb;
  --theme-sub: #9ca3af;
  --theme-muted: #6b7280;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --neon-cyan: #06b6d4;
  --neon-emerald: #10b981;
  --neon-amber: #f59e0b;
  --line-border: #1f293d;
  --box-radius: 14px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang HK", "Noto Sans HK", "Microsoft JhengHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { 
  background: var(--theme-bg); 
  color: var(--theme-text); 
  font-family: var(--font-stack); 
  line-height: 1.65; 
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: all 0.2s ease; }
a:hover { color: var(--neon-cyan); }

.wrapper { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }

.site-header { 
  background: rgba(9, 13, 22, 0.96); 
  backdrop-filter: blur(14px); 
  border-bottom: 1px solid var(--line-border); 
  position: sticky; 
  top: 0; 
  z-index: 100; 
}
.header-flex { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  min-height: 64px; 
  padding: 8px 0;
  flex-wrap: wrap;
  gap: 8px;
}
.brand-title { 
  font-size: 21px; 
  font-weight: 900; 
  color: var(--primary); 
  display: flex; 
  align-items: center; 
  gap: 8px; 
  letter-spacing: -0.02em;
}
.brand-title span { color: #fff; font-size: 14px; font-weight: 600; }

.main-menu { width: 100%; overflow-x: auto; padding-bottom: 4px; }
@media (min-width: 768px) {
  .main-menu { width: auto; overflow-x: visible; padding-bottom: 0; }
  .brand-title { font-size: 24px; }
}

.main-menu ul { 
  display: flex; 
  gap: 8px; 
  list-style: none; 
  white-space: nowrap;
}
.main-menu a { 
  display: block;
  font-weight: 700; 
  font-size: 13.5px; 
  color: var(--theme-sub); 
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(31, 41, 61, 0.5);
  border: 1px solid transparent;
}
.main-menu a.active, .main-menu a:hover { 
  color: #fff; 
  background: var(--primary); 
  border-color: rgba(255,255,255,0.15);
}

.layout-grid-3 { display: grid; grid-template-columns: 1fr; gap: 16px; margin: 20px 0; }
@media (min-width: 768px) {
  .layout-grid-3 { grid-template-columns: repeat(3, 1fr); gap: 24px; }
}

.review-card { 
  background: var(--theme-surface); 
  border: 1px solid var(--line-border); 
  border-radius: var(--box-radius); 
  padding: 20px;
  transition: transform 0.2s ease, border-color 0.2s ease; 
}
.review-card:hover { 
  transform: translateY(-3px); 
  border-color: var(--primary); 
  background: var(--theme-card);
}

.badge { 
  display: inline-block; 
  padding: 3px 9px; 
  border-radius: 6px; 
  font-size: 11px; 
  font-weight: 800; 
  margin-bottom: 10px; 
}
.badge-indigo { background: rgba(99, 102, 241, 0.18); color: var(--primary); }
.badge-cyan { background: rgba(6, 182, 212, 0.18); color: var(--neon-cyan); }
.badge-amber { background: rgba(245, 158, 11, 0.18); color: var(--neon-amber); }

.spec-score { 
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  width: 44px; 
  height: 44px; 
  background: linear-gradient(135deg, var(--primary), var(--neon-cyan)); 
  color: #fff; 
  font-weight: 900; 
  border-radius: 10px; 
  font-size: 17px; 
  flex-shrink: 0;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 14px;
  cursor: pointer;
  border: none;
  min-height: 44px;
  transition: all 0.2s ease;
}
.btn-accent { background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: #fff; }
.btn-accent:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { background: var(--theme-card); color: #fff; border: 1px solid var(--line-border); }
.btn-outline:hover { border-color: var(--neon-cyan); color: var(--neon-cyan); }

.content-box { 
  background: var(--theme-surface); 
  border: 1px solid var(--line-border); 
  border-radius: var(--box-radius); 
  padding: 20px; 
  margin: 20px 0; 
}
@media (min-width: 768px) { .content-box { padding: 40px; margin: 30px 0; } }

.content-box h1 { font-size: clamp(20px, 4.5vw, 28px); margin-bottom: 14px; color: #fff; line-height: 1.35; }
.content-box h2 { font-size: clamp(17px, 3.5vw, 22px); margin: 24px 0 10px; color: var(--neon-cyan); border-bottom: 1px solid var(--line-border); padding-bottom: 6px; }
.content-box p { color: var(--theme-sub); margin-bottom: 16px; font-size: 14.5px; line-height: 1.75; }
.content-box ul { margin-left: 20px; margin-bottom: 18px; color: var(--theme-sub); font-size: 14.5px; }
.content-box li { margin-bottom: 8px; }

.spec-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 13.5px; }
.spec-table th, .spec-table td { padding: 10px 12px; border: 1px solid var(--line-border); text-align: left; }
.spec-table th { background: rgba(31, 41, 61, 0.6); color: #fff; }
.spec-table td { color: var(--theme-sub); }

.site-footer { 
  background: #05070c; 
  border-top: 1px solid var(--line-border); 
  padding: 40px 0 20px; 
  margin-top: 40px; 
  font-size: 13px; 
  color: var(--theme-sub); 
}
.footer-layout { display: grid; grid-template-columns: 1fr; gap: 24px; margin-bottom: 30px; }
@media (min-width: 768px) { .footer-layout { grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; } }
.footer-layout h4 { color: #fff; margin-bottom: 12px; font-size: 15px; }
.footer-layout ul { list-style: none; }
.footer-layout li { margin-bottom: 8px; }
.footer-copy { border-top: 1px solid var(--line-border); padding-top: 20px; text-align: center; font-size: 12px; }