:root {
  --bg: #f4f6f8;
  --card: #fff;
  --line: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --danger: #dc2626;
  --ok: #059669;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: #111827;
  color: #fff;
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.brand { font-weight: 700; font-size: 18px; padding: 0 8px; }
.sidebar nav { display: flex; flex-direction: column; gap: 6px; }
.nav {
  border: 0;
  background: transparent;
  color: #d1d5db;
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
}
.nav.active, .nav:hover { background: #1f2937; color: #fff; }
.sidebar-foot { margin-top: auto; }
.user-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px;
  border-top: 1px solid #374151;
}
.user-line .muted { color: #9ca3af; }
.btn-logout {
  border: 1px solid #4b5563;
  background: transparent;
  color: #e5e7eb;
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 12px;
}
.btn-logout:hover { background: #1f2937; }

.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #334155 100%);
}
.login-card {
  width: min(380px, 92vw);
  background: #fff;
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.login-card h1 { margin: 0 0 6px; font-size: 22px; }
.login-card label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
.login-card input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}

.main { flex: 1; padding: 20px 24px 40px; }
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.topbar h1 { margin: 0; font-size: 22px; }
.page.hidden { display: none; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.btn, .btn-primary, .btn-danger {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
input[type="text"], input[type="number"], input[type="password"], textarea, select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: #fff;
}
textarea { width: 100%; min-height: 140px; font-family: ui-monospace, Consolas, monospace; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; font-size: 14px; }
th { color: var(--muted); font-weight: 600; }
.muted { color: var(--muted); font-size: 13px; }
.ok { color: var(--ok); }
.err { color: var(--danger); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.site-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
  cursor: pointer;
}
.site-card:hover { border-color: var(--primary); }
.site-card h3 { margin: 0 0 8px; font-size: 16px; word-break: break-all; }
.thumb {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 8px;
  background: #eee;
}
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.breadcrumb { margin-bottom: 12px; }
.breadcrumb a { color: var(--primary); cursor: pointer; text-decoration: none; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.stat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.stat .label { color: var(--muted); font-size: 12px; }
.stat .value { font-size: 20px; font-weight: 700; margin-top: 6px; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}
.form-grid input, .form-grid select { width: 100%; }
@media (max-width: 800px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; }
}