:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --line: #e5e7eb;
  --brand: #e60013;
  --brand-dark: #b3000f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-dark);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
}

.hero {
  padding: 76px 0 56px;
  background: linear-gradient(180deg, #ffffff 0%, #f7f8fa 100%);
}

.hero-inner {
  max-width: 860px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 44px);
  line-height: 1.2;
}

.hero-desc {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.section {
  padding: 62px 0;
}

.section-alt {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 18px;
  font-size: 28px;
}

.section-lead {
  margin: 0;
  color: var(--muted);
  max-width: 840px;
}

.grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: #6b7280;
  font-size: 13px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .nav {
    display: none;
  }
}