:root {
  --bg: #f4f1ea;
  --paper: #fffcf6;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e0d4;
  --accent: #1464b4;
  --accent-ink: #0b4f91;
  --mark: #f59e0b;
  --shadow: 0 12px 40px rgba(28, 25, 23, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(20, 100, 180, 0.08), transparent 60%),
    var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC",
    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  border-radius: 6px;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: rgba(244, 241, 234, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img {
  width: 36px;
  height: 20px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent-ink);
}

.site-nav a:focus-visible,
.brand:focus-visible,
.btn:focus-visible,
.site-footer a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.wrap {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

.hero {
  margin-bottom: 36px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

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

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 28px 28px 8px;
}

h2 {
  margin: 32px 0 12px;
  font-size: 22px;
  line-height: 1.4;
}

h2:first-child {
  margin-top: 0;
}

p,
li {
  color: var(--ink);
}

.muted {
  color: var(--muted);
}

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

a:hover {
  color: var(--accent-ink);
}

ol,
ul {
  padding-left: 1.2em;
}

li + li {
  margin-top: 6px;
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

.steps li {
  position: relative;
  margin: 0 0 16px;
  padding: 14px 16px 14px 52px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 16px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  line-height: 26px;
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 24px;
  font-size: 15px;
}

th,
td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 600;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}

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

.btn-primary:hover {
  background: var(--accent-ink);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--accent-ink);
  border: 1px solid var(--line);
}

.site-footer {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto 40px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 10px;
}

.updated {
  margin-top: 8px;
  font-size: 13px;
}

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 16px;
  }

  .wrap {
    width: min(760px, calc(100% - 28px));
    padding-top: 28px;
  }

  .card {
    padding: 20px 18px 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}