:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5a5a5a;
  --border: #e2e2e2;
  --accent: #1f5fa8;
  --card-bg: #f6f8fa;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #16181c;
    --text: #e9e9e9;
    --muted: #a3a3a3;
    --border: #2c2f36;
    --accent: #7db1e8;
    --card-bg: #1e2126;
  }
}
:root[data-theme="dark"] {
  --bg: #16181c;
  --text: #e9e9e9;
  --muted: #a3a3a3;
  --border: #2c2f36;
  --accent: #7db1e8;
  --card-bg: #1e2126;
}
* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  margin: 0;
  padding: 0;
}
.nav {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}
.nav .logo { font-weight: 800; font-size: 18px; color: var(--accent); text-decoration: none; }
.nav a { color: var(--text); text-decoration: none; margin-left: 20px; font-size: 14px; }
.nav a:hover { color: var(--accent); }
.wrap { max-width: 720px; margin: 0 auto; padding: 48px 24px 80px; }
header.page-header { border-bottom: 3px solid var(--accent); padding-bottom: 20px; margin-bottom: 32px; }
header.page-header .brand { font-size: 14px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
h1 { font-size: 30px; margin: 8px 0 4px; }
.updated { color: var(--muted); font-size: 14px; }
h2 { font-size: 19px; margin-top: 36px; border-left: 4px solid var(--accent); padding-left: 12px; }
p, li, label { font-size: 15.5px; }
ul { padding-left: 22px; }
.callout { background: var(--card-bg); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; margin: 18px 0; }
.callout strong { color: var(--accent); }
a { color: var(--accent); }
footer.page-footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }
.hero { text-align: center; padding: 60px 24px; }
.hero h1 { font-size: 36px; margin-bottom: 12px; }
.hero p { color: var(--muted); font-size: 17px; max-width: 520px; margin: 0 auto; }
.btn { display: inline-block; margin-top: 24px; background: var(--accent); color: #fff; padding: 12px 28px; border-radius: 8px; text-decoration: none; font-weight: 600; }
form { display: flex; flex-direction: column; gap: 18px; margin-top: 20px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; }
.field input, .field textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text); font-size: 15px; }
.checkbox-row { display: flex; gap: 10px; align-items: flex-start; background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; }
.checkbox-row input { margin-top: 4px; }
.checkbox-row label { font-size: 14px; font-weight: 400; color: var(--text); }
button[type="submit"] { background: var(--accent); color: #fff; border: none; padding: 13px 24px; border-radius: 8px; font-size: 15.5px; font-weight: 600; cursor: pointer; width: fit-content; }
button[type="submit"]:hover { opacity: 0.9; }
.required { color: #b3241a; }