/* Base */
:root {
  --bg: #0b0f14;
  --surface: #10151c;
  --text: #eaf0f6;
  --muted: #b8c4d4;
  --primary: #2dd4bf;
  --primary-700: #14b8a6;
  --accent: #60a5fa;
  --card: #121922;
  --border: #1f2937;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans TC', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, #0e1622 0%, var(--bg) 40%),
              radial-gradient(1000px 500px at 90% -20%, #0d1b2a 0%, var(--bg) 50%),
              var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(180%) blur(8px);
  background: rgba(16, 21, 28, 0.7);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}
.logo { font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: .5px; }
.nav a { color: var(--muted); text-decoration: none; margin-left: 16px; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 72px 0 40px;
  text-align: center;
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.badge.iso {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 12px;
  border-radius: 999px;
  color: #042f2e;
  background: linear-gradient(90deg, #99f6e4, #a7f3d0);
  font-weight: 700;
  font-size: 13px;
}
h1 { font-size: 36px; line-height: 1.2; margin: 8px 0 12px; }
.lead { color: var(--muted); font-size: 18px; }

.cta-group { display: flex; gap: 12px; justify-content: center; margin-top: 20px; }
.btn {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  background: rgba(16, 21, 28, 0.6);
  text-decoration: none;
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
}
.btn.small { padding: 8px 12px; font-size: 14px; }
.btn:hover { transform: translateY(-1px); border-color: #334155; }
.btn.primary {
  background: linear-gradient(180deg, var(--primary), var(--primary-700));
  border: none;
  color: #052016;
  font-weight: 700;
}
.btn.primary:hover { filter: brightness(1.05); }

/* Sections */
.section { padding: 56px 0; }
.section.alt { background: linear-gradient(180deg, rgba(16,21,28,.6), rgba(16,21,28,.9)); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
h2 { font-size: 28px; margin: 0 0 16px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

.card {
  background: linear-gradient(180deg, #0f172a, #0b1220);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 6px 20px rgba(0,0,0,.25);
}
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { color: var(--muted); margin: 0; }

.list { margin: 12px 0 0; padding-left: 20px; color: var(--muted); }
.list li { margin: 6px 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); }
.footer-inner { text-align: center; padding: 20px 0; color: var(--muted); }