:root {
  color-scheme: light;
  --bg: #f6f9ff;
  --panel: #ffffff;
  --text: #10203f;
  --muted: #5c6b86;
  --line: #dce6f5;
  --brand: #1268ff;
  --brand-dark: #073d91;
  --accent: #10c7b5;
  --warning: #f36b21;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
  line-height: 1.7;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: linear-gradient(135deg, #ffffff 0%, #e9f3ff 58%, #dffbf7 100%);
  border-bottom: 1px solid var(--line);
}

.nav {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1040px;
  padding: 18px 22px;
}

.brand {
  align-items: center;
  color: var(--brand-dark);
  display: flex;
  font-weight: 800;
  gap: 10px;
  letter-spacing: 0;
}

.brand-mark {
  align-items: center;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  border-radius: 10px;
  color: #fff;
  display: inline-flex;
  font-size: 16px;
  height: 34px;
  justify-content: center;
  width: 34px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.hero {
  margin: 0 auto;
  max-width: 1040px;
  padding: 54px 22px 62px;
}

.hero h1 {
  color: var(--brand-dark);
  font-size: clamp(36px, 6vw, 68px);
  line-height: 1.05;
  margin: 0 0 18px;
}

.hero p {
  color: var(--muted);
  font-size: 19px;
  margin: 0;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: inline-flex;
  font-weight: 750;
  min-height: 44px;
  padding: 9px 16px;
}

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

.button.secondary {
  background: #fff;
  color: var(--brand-dark);
}

.container {
  margin: 0 auto;
  max-width: 1040px;
  padding: 34px 22px 70px;
}

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.doc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 14px 40px rgba(35, 80, 150, 0.08);
}

.card {
  padding: 22px;
}

.card h2,
.doc h2 {
  color: var(--brand-dark);
  font-size: 22px;
  line-height: 1.25;
  margin: 0 0 10px;
}

.card p {
  color: var(--muted);
  margin: 0 0 18px;
}

.doc {
  padding: 34px;
}

.doc h1 {
  color: var(--brand-dark);
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.12;
  margin: 0 0 8px;
}

.doc .meta {
  color: var(--muted);
  margin: 0 0 28px;
}

.doc h2 {
  border-top: 1px solid var(--line);
  margin-top: 30px;
  padding-top: 24px;
}

.doc h2:first-of-type {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.doc p,
.doc li {
  color: #23314f;
}

.doc ul,
.doc ol {
  padding-left: 24px;
}

.notice {
  background: #fff8f0;
  border: 1px solid #ffd8b8;
  border-radius: 8px;
  color: #6f3b0b;
  margin: 22px 0;
  padding: 14px 16px;
}

.support-list {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.support-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.support-item strong {
  color: var(--brand-dark);
  display: block;
  margin-bottom: 4px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  padding: 24px 22px;
  text-align: center;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .doc {
    padding: 24px 18px;
  }
}