/* base.css —— 所有站点共用的骨架与组件，站点通过 theme.css 覆盖配色 */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #f6f7f9;
  --fg: #1f2329;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --radius: 10px;
}

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.3; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 顶部导航 */
.site-head { background: #fff; border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--fg); }
.brand .mark { width: 30px; height: 30px; border-radius: 8px; background: var(--brand); color: #fff;
  display: grid; place-items: center; font-size: 13px; font-weight: 700; }
.nav { display: flex; gap: 22px; font-size: 14px; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--fg); text-decoration: none; }

/* 首页区块 */
.hero { padding: 68px 0 52px; text-align: center; }
.hero h1 { font-size: 34px; margin: 0 0 14px; letter-spacing: -.5px; }
.hero p { color: var(--muted); margin: 0 auto; max-width: 640px; font-size: 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; padding: 8px 0 64px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.section-title { font-size: 20px; margin: 0 0 18px; }

.site-foot { border-top: 1px solid var(--line); background: #fff; padding: 24px 0; }
.site-foot .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  color: var(--muted); font-size: 13px; }

/* 登录 / 表单 */
.auth { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 28px 16px; }
.auth-card {
  width: 100%; max-width: 360px; background: #fff; border: 1px solid var(--line);
  border-radius: 12px; padding: 26px; box-shadow: 0 12px 32px rgba(15, 23, 42, .07);
}
.auth-card h1 { font-size: 20px; margin: 0 0 6px; }
.auth-card .sub { color: var(--muted); font-size: 13px; margin: 0 0 20px; }

label { display: block; font-size: 13px; color: var(--muted); margin: 0 0 6px; }
input[type="text"], input[type="password"], input[type="email"], select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--fg); outline: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--brand); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
textarea { min-height: 110px; resize: vertical; }
.field { margin-bottom: 14px; }
.row { display: flex; gap: 12px; }
.row > .field { flex: 1; }

.btn {
  display: inline-block; width: 100%; padding: 11px 14px; border: 0; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 14px; font-weight: 600;
  font-family: inherit; cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn[disabled] { opacity: .65; cursor: default; }

.alert {
  background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c;
  border-radius: 8px; padding: 10px 12px; font-size: 13px; margin-bottom: 16px;
}
.alert-ok { background: #f0fdf4; border-color: #bbf7d0; color: #15803d; }
.hint { color: var(--muted); font-size: 12px; margin-top: 14px; }

.meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: 16px; }
.center { text-align: center; }

/* 404 */
.err-page { min-height: 58vh; display: flex; flex-direction: column; align-items: center;
  justify-content: center; text-align: center; padding: 40px 20px; }
.err-page .code { font-size: 64px; font-weight: 800; color: var(--line); margin: 0; letter-spacing: 2px; }
.err-page h2 { margin: 10px 0 8px; font-size: 18px; }
.err-page p { color: var(--muted); margin: 0 0 20px; font-size: 14px; }
.err-page .path { font-family: ui-monospace, Menlo, Consolas, monospace; background: #fff;
  border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px; color: var(--fg); }

@media (max-width: 640px) {
  .hero { padding: 44px 0 32px; }
  .hero h1 { font-size: 26px; }
  .nav { display: none; }
}