:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --ink: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --maxw: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* Bilingual secondary voice */
.en {
  display: block;
  color: var(--muted);
  font-size: 0.82em;
  font-weight: 400;
  letter-spacing: 0.2px;
  line-height: 1.5;
  margin-top: 6px;
}
h1 .en, h2 .en { font-size: 0.5em; font-weight: 700; margin-top: 8px; }
.eyebrow .en { margin-top: 4px; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid #eef2f7;
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 28px; font-size: 15px; color: var(--muted); }
.nav-links a:hover, .nav-links a.active { color: var(--ink); }

/* Hero */
.hero {
  background: linear-gradient(180deg, #f6f8fb 0%, #ffffff 100%);
  padding: 96px 24px 80px;
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; text-align: center; }
.eyebrow {
  color: var(--primary);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero h1 { font-size: 44px; line-height: 1.2; font-weight: 800; }
.lead {
  max-width: 640px;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 17px;
}
.hero-actions { margin-top: 36px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #fff; color: var(--ink); border: 1px solid #e2e8f0; }

/* Features */
.features { padding: 72px 24px; }
.features-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: var(--bg-soft);
  border: 1px solid #eef2f7;
  border-radius: var(--radius);
  padding: 32px 28px;
}
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: #e0ecff;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 18px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }

/* CTA */
.cta { padding: 72px 24px; background: var(--bg-soft); }
.cta-inner { max-width: 720px; margin: 0 auto; text-align: center; }
.cta h2 { font-size: 32px; font-weight: 800; }
.cta p { color: var(--muted); margin: 14px 0 28px; font-size: 17px; }

/* Page (about) */
.page { padding: 72px 24px; }
.page-inner { max-width: 760px; margin: 0 auto; }
.page h1 { font-size: 38px; font-weight: 800; margin-bottom: 16px; }
.page h2 { font-size: 24px; font-weight: 700; margin: 36px 0 12px; }
.page .lead { color: var(--muted); font-size: 18px; margin-bottom: 8px; }
.values { margin: 8px 0 0 20px; }
.values li { margin-bottom: 10px; }
.back { margin-top: 40px; }
.back a { color: var(--primary); font-weight: 600; }

/* Footer */
.footer { border-top: 1px solid #eef2f7; padding: 28px 24px; }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 820px) {
  .features-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .nav-links { gap: 18px; }
}