:root {
  --c-ink: #1a2233;
  --c-blue: #1f4e8c;
  --c-blue-dark: #163a6b;
  --c-accent: #c8915a;
  --c-bg-alt: #f4f7fb;
  --c-gray: #5b6577;
  --c-line: #e4e9f1;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(26, 34, 51, 0.08);
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--c-ink);
  line-height: 1.7;
  background: #fff;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 800; font-size: 22px; letter-spacing: 1px; color: var(--c-blue); }
.logo span { color: var(--c-accent); }
.main-nav ul { display: flex; gap: 26px; list-style: none; }
.main-nav a { font-size: 15px; color: var(--c-ink); padding: 6px 0; transition: color .2s; }
.main-nav a:hover, .main-nav a.active { color: var(--c-blue); }
.nav-toggle { display: none; background: none; border: 0; font-size: 24px; cursor: pointer; }

.btn {
  display: inline-block; padding: 11px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all .2s; border: 1px solid transparent;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: #b47e49; }
.btn-ghost { border-color: var(--c-blue); color: var(--c-blue); }
.btn-ghost:hover { background: var(--c-blue); color: #fff; }
.header-cta { margin-left: 14px; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--c-blue-dark), var(--c-blue));
  color: #fff; padding: 92px 0 100px; text-align: center;
}
.hero-tag { display: inline-block; padding: 6px 16px; border: 1px solid rgba(255,255,255,.4);
  border-radius: 999px; font-size: 14px; margin-bottom: 20px; }
.hero h1 { font-size: 42px; line-height: 1.25; margin-bottom: 18px; font-weight: 800; }
.hero-sub { font-size: 18px; opacity: .9; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero .btn-ghost { color: #fff; border-color: #fff; }
.hero .btn-ghost:hover { background: #fff; color: var(--c-blue); }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-title { font-size: 30px; text-align: center; margin-bottom: 12px; font-weight: 800; }
.section-desc { text-align: center; color: var(--c-gray); margin-bottom: 40px; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 28px 22px; box-shadow: var(--shadow); transition: transform .2s; }
.card:hover { transform: translateY(-4px); }
.card-icon { font-size: 34px; margin-bottom: 12px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--c-gray); font-size: 14.5px; margin-bottom: 14px; }
.card a { color: var(--c-blue); font-weight: 600; font-size: 14px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feature { background: #fff; border-radius: var(--radius); padding: 26px 22px; border-top: 3px solid var(--c-accent); }
.feature h3 { font-size: 18px; margin-bottom: 8px; }
.feature p { color: var(--c-gray); font-size: 14.5px; }

/* Process */
.process { list-style: none; display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; counter-reset: step; }
.process li { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 22px 14px; text-align: center; font-weight: 600; position: relative; }
.process li span { display: block; font-size: 26px; font-weight: 800; color: var(--c-accent); margin-bottom: 6px; }

/* CTA */
.cta-section { background: linear-gradient(135deg, var(--c-blue), var(--c-blue-dark)); color: #fff; text-align: center; }
.cta-section h2 { font-size: 28px; margin-bottom: 12px; }
.cta-section p { opacity: .9; margin-bottom: 26px; }

/* Footer */
.site-footer { background: #11192b; color: #cdd5e3; padding: 54px 0 0; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding-bottom: 36px; }
.site-footer .logo { color: #fff; }
.site-footer .logo span { color: var(--c-accent); }
.footer-desc { margin-top: 12px; font-size: 14px; max-width: 320px; }
.site-footer h4 { color: #fff; margin-bottom: 14px; font-size: 16px; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #cdd5e3; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #243049; padding: 18px 0; text-align: center; font-size: 13px; color: #8a95a8; }
.footer-bottom a { color: var(--c-accent); }

.area-text { color: var(--c-gray); font-size: 14.5px; text-align: center; }

/* Responsive */
@media (max-width: 900px) {
  .card-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(3, 1fr); }
  .footer-inner { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .main-nav ul { display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 14px 20px; border-bottom: 1px solid var(--c-line); }
  .main-nav.open ul { display: flex; }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .hero h1 { font-size: 30px; }
  .card-grid, .feature-grid, .process { grid-template-columns: 1fr; }
}