:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f4f5f7;
  --surface-strong: #eceef1;
  --text: #111214;
  --muted: #8b8d93;
  --accent: #4aaea8;
  --accent-soft: #d9f1ef;
  --border: #d8dadd;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --surface-strong: #2c2c2e;
    --text: #f7f7f8;
    --muted: #98989f;
    --accent: #67c8c2;
    --accent-soft: #163936;
    --border: #343438;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a:hover { text-decoration: underline; }

.shell {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 100vh;
}

.hero {
  padding: 96px 0 56px;
  max-width: 760px;
}

.brand-mark {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: white;
  font-weight: 800;
  font-size: 28px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

h2 {
  margin: 38px 0 10px;
  font-size: 28px;
  letter-spacing: -0.025em;
}

h3 {
  margin: 28px 0 8px;
  font-size: 20px;
}

p { margin: 0 0 16px; }

.lede {
  margin-top: 24px;
  color: var(--muted);
  font-size: clamp(20px, 3vw, 26px);
  max-width: 720px;
}

.lede.compact { max-width: 660px; }

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 650;
}

.button:hover { text-decoration: none; }

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 8px 0 72px;
}

.card,
.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
}

.card h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.card p,
.updated,
.policy > p,
.policy li {
  color: var(--muted);
}

.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.topnav .brand {
  color: var(--text);
  font-weight: 800;
  font-size: 20px;
}

.topnav div { display: flex; gap: 20px; }

.document .policy {
  max-width: 760px;
  padding: 64px 0 56px;
}

.document h1 {
  font-size: clamp(38px, 6vw, 60px);
}

.updated { margin-top: 14px; }

.policy > p:first-of-type:not(.eyebrow) {
  font-size: 19px;
}

.policy ul {
  padding-left: 24px;
  margin: 10px 0 18px;
}

.policy li { margin: 8px 0; }

.notice {
  margin: 30px 0 36px;
}

.notice strong {
  display: block;
  font-size: 22px;
  margin-bottom: 6px;
}

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

.notice .button { margin-top: 8px; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 28px 0 42px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

footer nav {
  display: flex;
  gap: 18px;
}

.error-page {
  min-height: 90vh;
  display: grid;
  place-items: center;
  text-align: center;
}

.error-page .card { max-width: 560px; }

@media (max-width: 760px) {
  .shell { width: min(100% - 28px, 960px); }
  .hero { padding-top: 64px; }
  .grid { grid-template-columns: 1fr; }
  .document .policy { padding-top: 46px; }
  footer { align-items: flex-start; flex-direction: column; }
}