:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #0a84ff;
  --accent-soft: #e8f3ff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --card: #111827;
    --text: #f9fafb;
    --muted: #9ca3af;
    --border: #253044;
    --accent-soft: #10253d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  padding: 32px 0 12px;
}

.brand {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.subtitle {
  color: var(--muted);
  margin-top: 4px;
}

nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 22px 0 10px;
}

nav a {
  text-decoration: none;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 9px 14px;
  font-weight: 600;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  margin: 16px 0;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: 30px; }
h2 { font-size: 22px; margin-top: 0; }

ul { padding-left: 22px; }

.badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 5px 10px;
  margin-bottom: 8px;
}

.note {
  color: var(--muted);
  font-size: 14px;
}

.email-placeholder {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-all;
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 2px 6px;
}

footer {
  color: var(--muted);
  font-size: 14px;
  padding: 24px 0 40px;
}

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