:root {
  --primary: #1b5bd7;
  --primary-dark: #1448ac;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2a3d;
  --muted: #6b7a90;
  --border: #e3e8f0;
  --danger: #d93025;
  --success: #1e8e3e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.shell { width: min(960px, 92%); margin: 0 auto; }

.site-header {
  background: linear-gradient(120deg, #143d8f, var(--primary));
  color: #fff;
  padding: 18px 0;
  box-shadow: 0 2px 10px rgba(20, 61, 143, .25);
}
.site-header .shell { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px;
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .35);
  font-weight: 700; font-size: 18px; letter-spacing: 1px;
}
.brand strong { font-size: 18px; display: block; letter-spacing: 2px; }
.brand small { color: rgba(255, 255, 255, .82); font-size: 12px; }
.header-link { color: #fff; text-decoration: none; border: 1px solid rgba(255,255,255,.5); padding: 6px 14px; border-radius: 8px; font-size: 14px; }
.header-link:hover { background: rgba(255,255,255,.12); }

main.shell { flex: 1; padding: 32px 0 48px; }

.hero { text-align: center; margin: 12px 0 28px; }
.hero h1 { margin: 8px 0 10px; font-size: 28px; }
.hero p { color: var(--muted); margin: 0 auto; max-width: 560px; line-height: 1.7; }
.eyebrow { color: var(--primary); font-size: 12px; font-weight: 700; letter-spacing: 3px; margin: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 6px 24px rgba(31, 42, 61, .06);
}
.form-card, .login-card, .success-card { max-width: 560px; margin: 0 auto; }

.tabs { display: flex; gap: 10px; margin-bottom: 22px; }
.tab {
  flex: 1; padding: 12px; border: 1px solid var(--border); border-radius: 10px;
  background: #f8fafd; color: var(--muted); font-size: 15px; cursor: pointer;
  transition: all .15s ease;
}
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }

.field { margin-bottom: 18px; }
.field label { display: block; margin-bottom: 6px; font-size: 14px; font-weight: 600; }
.field label span { color: var(--danger); }
.field input {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 15px; outline: none; transition: border .15s ease;
}
.field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(27, 91, 215, .12); }
.hidden { display: none; }

.primary {
  width: 100%; padding: 13px; border: none; border-radius: 10px; cursor: pointer;
  background: var(--primary); color: #fff; font-size: 16px; font-weight: 600;
  transition: background .15s ease;
}
.primary:hover { background: var(--primary-dark); }
.primary.inline { display: inline-block; width: auto; padding: 11px 28px; text-decoration: none; margin-top: 8px; }

.privacy { color: var(--muted); font-size: 13px; margin: 14px 0 0; text-align: center; }

.notice {
  max-width: 560px; margin: 0 auto 16px; padding: 12px 16px; border-radius: 10px; font-size: 14px;
}
.notice.error { background: #fdecea; color: var(--danger); border: 1px solid #f5c6c0; }

.success-card { text-align: center; padding: 48px 28px; }
.success-icon {
  width: 64px; height: 64px; margin: 0 auto 16px; border-radius: 50%;
  background: #e6f4ea; color: var(--success); font-size: 32px; line-height: 64px;
}
.success-card p { color: var(--muted); }

.admin-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.admin-top h1 { margin: 6px 0 0; font-size: 24px; }
.admin-actions { display: flex; gap: 10px; }
.secondary {
  display: inline-block; padding: 9px 16px; border: 1px solid var(--border); border-radius: 10px;
  background: #fff; color: var(--text); text-decoration: none; font-size: 14px;
}
.secondary:hover { border-color: var(--primary); color: var(--primary); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 20px; }
.stats > div {
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  padding: 18px; text-align: center;
}
.stats strong { display: block; font-size: 26px; color: var(--primary); }
.stats span { color: var(--muted); font-size: 13px; }

.table-card { padding: 8px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; background: #f8fafd; }
tbody tr:hover { background: #f6f9ff; }
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.group { background: #e8f0fe; color: var(--primary); }
.badge.individual { background: #e6f4ea; color: var(--success); }
.empty { text-align: center; color: var(--muted); padding: 32px; }

footer {
  text-align: center; color: var(--muted); font-size: 13px; padding: 20px 0;
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .hero h1 { font-size: 22px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .card { padding: 20px; }
}