:root {
  --fg: #1f2328;
  --muted: #656d76;
  --accent: #4a7dff;
  --bg: #f6f7f9;
  --card: #fff;
  --border: #e3e6ea;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--fg);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
.container { max-width: 1080px; margin: 0 auto; padding: 16px; width: 100%; }
.site-header { background: var(--card); border-bottom: 1px solid var(--border); }
.nav {
  max-width: 1080px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
.nav-links { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--accent); text-decoration: none; }
.muted { color: var(--muted); }
.error {
  color: #c0392b; background: #fdecea; border: 1px solid #f5c6c0;
  padding: 10px 12px; border-radius: 6px;
}
.success {
  color: #1e7e34; background: #e9f7ec; border: 1px solid #bfe6c8;
  padding: 10px 12px; border-radius: 6px;
}
.form { display: flex; flex-direction: column; gap: 12px; max-width: 360px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.form input {
  padding: 8px 10px; border: 1px solid var(--border);
  border-radius: 6px; font-size: 15px; background: var(--card);
}
.form button, .btn {
  padding: 9px 14px; border: 0; border-radius: 6px;
  background: var(--accent); color: #fff; font-size: 15px;
  cursor: pointer; text-decoration: none; display: inline-block;
}
.inline { display: inline; }
button.link {
  background: none; border: 0; color: var(--accent);
  cursor: pointer; padding: 0; font-size: inherit;
}
h1 { font-size: 22px; }
.site-footer { border-top: 1px solid var(--border); background: var(--card); padding: 10px 0; font-size: 13px; }