:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #1c2230;
  --color-text-muted: #5b6472;
  --color-border: #e5e8ec;
  --color-primary: #2554ea;
  --color-primary-dark: #1a3fc4;
  --color-primary-soft: #eef2ff;
  --radius: 12px;
  --max-width: 860px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #4c7dff 100%);
  color: #fff;
  padding: 48px 0 40px;
}

.site-header .wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.18);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.02em;
}

.brand-name {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-weight: 400;
  opacity: 0.85;
}

.tagline {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Content */
.content {
  padding: 40px 24px 80px;
}

.updated {
  color: var(--color-text-muted);
  font-size: 13.5px;
  margin: 0 0 28px;
}

.intro p {
  font-size: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 0 0 32px;
}

/* Table of contents */
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.toc-title {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 32px;
}

.toc li {
  break-inside: avoid;
  margin-bottom: 6px;
  font-size: 14.5px;
}

.toc a {
  color: var(--color-primary);
  text-decoration: none;
}

.toc a:hover {
  text-decoration: underline;
}

/* Sections */
section {
  margin-bottom: 40px;
  scroll-margin-top: 24px;
}

h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-primary-soft);
  color: var(--color-text);
}

h3 {
  font-size: 15.5px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--color-text);
}

p {
  margin: 0 0 14px;
  color: var(--color-text);
  font-size: 15px;
}

section p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-primary);
}

/* Info card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 18px 0;
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.info-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0;
}

/* Lists */
.policy-list {
  margin: 0 0 14px;
  padding-left: 22px;
}

.policy-list li {
  margin-bottom: 10px;
  font-size: 15px;
}

.policy-list li:last-child {
  margin-bottom: 0;
}

/* Contact card */
.contact-card {
  background: var(--color-primary-soft);
  border: 1px solid #d7e0fb;
  border-radius: var(--radius);
  padding: 20px 22px;
}

.contact-card p {
  margin: 0 0 4px;
  font-size: 14.5px;
}

.contact-card p:first-child {
  font-size: 16px;
  font-weight: 700;
}

.contact-card a {
  font-weight: 600;
  text-decoration: none;
}

.contact-card a:hover {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 28px 0;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
}

.site-footer p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .site-header {
    padding: 36px 0 28px;
  }

  .content {
    padding: 32px 16px 60px;
  }

  .toc ol {
    columns: 1;
  }

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

  h2 {
    font-size: 18px;
  }

  .site-footer .wrap {
    flex-direction: column;
    text-align: center;
  }
}