/* MIND FLOW 思維流 — landing styles
 * Primary: #0D1B2A (深科藍)
 * Accent : #2563FF (亮科技藍)
 */
:root {
  --primary: #0D1B2A;
  --accent : #2563FF;
  --bg     : #FFFFFF;
  --bg-soft: #F5F7FA;
  --border : #E6EBF1;
  --muted  : #64748B;
  --text   : #0F172A;
  --maxw   : 1100px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; }
.brand img { display: block; }
.site-header nav a {
  margin-left: 24px;
  color: var(--primary);
  font-weight: 600;
  font-size: 15px;
}

/* Hero */
.hero {
  padding: 80px 0 96px;
  text-align: center;
  background:
    radial-gradient(ellipse at top left, rgba(37,99,255,0.06), transparent 60%),
    radial-gradient(ellipse at top right, rgba(13,27,42,0.04), transparent 60%);
}
.hero h1 {
  font-size: 48px; line-height: 1.2;
  font-weight: 800;
  color: var(--primary);
  margin: 0 0 24px;
  letter-spacing: 1px;
}
.hero .lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto 36px;
}
.cta-row {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 700; font-size: 16px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: transform 0.1s, box-shadow 0.1s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 4px 14px rgba(37,99,255,0.25);
}
.btn-primary:hover { background: #1E4FE6; }
.btn-secondary {
  background: transparent; color: var(--primary);
  border-color: var(--primary);
}
.btn-secondary:hover { background: var(--primary); color: #fff; }

/* Section common */
section { padding: 80px 0; }
section h2 {
  font-size: 32px; font-weight: 800;
  text-align: center; color: var(--primary);
  margin: 0 0 16px;
}

/* Features */
.features { background: var(--bg-soft); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.feature-card {
  background: #fff;
  padding: 28px 24px;
  border-radius: 16px;
  border: 1px solid var(--border);
}
.feature-icon { font-size: 36px; margin-bottom: 12px; }
.feature-card h3 {
  font-size: 19px; margin: 0 0 8px; color: var(--primary);
}
.feature-card p { margin: 0; color: var(--muted); font-size: 15px; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: center;
}
.about p { color: var(--muted); font-size: 16px; }
.about strong { color: var(--primary); }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat {
  background: var(--primary);
  color: #fff;
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}
.stat-num {
  font-size: 36px; font-weight: 800;
  color: var(--accent);
}
.stat:nth-child(odd) .stat-num { color: #fff; }
.stat-label { font-size: 13px; opacity: 0.85; margin-top: 4px; }

/* Download */
.download { text-align: center; }
.download .muted-note { color: var(--muted); margin-top: 16px; font-size: 14px; }

/* Footer */
.site-footer {
  background: var(--primary);
  color: #CBD5E1;
  padding: 48px 0 32px;
}
.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.site-footer p { margin: 8px 0 0; }
.footer-nav { display: flex; flex-direction: column; gap: 8px; }
.footer-nav a { color: #CBD5E1; font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.muted { color: var(--muted); }
.site-footer .muted { color: #94A3B8; }
.small { font-size: 12px; opacity: 0.7; }

/* Article (privacy/terms/support) */
.article {
  max-width: 800px;
  margin: 60px auto;
  padding: 0 24px;
}
.article h1 {
  font-size: 36px; color: var(--primary);
  margin: 0 0 8px;
}
.article .subtitle { color: var(--muted); margin-bottom: 32px; }
.article h2 {
  font-size: 22px;
  color: var(--primary);
  margin: 36px 0 12px;
  text-align: left;
}
.article h3 {
  font-size: 17px;
  color: var(--primary);
  margin: 24px 0 8px;
}
.article p, .article li {
  color: var(--text);
  font-size: 15.5px;
  line-height: 1.75;
}
.article ul { padding-left: 24px; }
.article .effective {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-soft);
  border-radius: 6px;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--border);
}

/* Mobile */
@media (max-width: 720px) {
  .hero { padding: 56px 0 64px; }
  .hero h1 { font-size: 34px; }
  .hero .lead { font-size: 16px; }
  section { padding: 56px 0; }
  section h2 { font-size: 26px; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer .footer-grid { grid-template-columns: 1fr; }
  .site-header nav a { margin-left: 14px; font-size: 14px; }
}