:root {
  --bg-deep: #0b1220;
  --bg-panel: #121a2b;
  --bg-elevated: #182338;
  --border: rgba(148, 163, 184, 0.16);
  --text: #e8eef9;
  --text-muted: #93a4c3;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --danger: #f87171;
  --success: #34d399;
  --warning: #fbbf24;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --sidebar-width: 248px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(45, 212, 191, 0.12), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(56, 189, 248, 0.10), transparent 50%),
    linear-gradient(180deg, #0a101c 0%, var(--bg-deep) 100%);
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #5eead4; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(420px, 100%);
  background: linear-gradient(180deg, rgba(24, 35, 56, 0.95), rgba(18, 26, 43, 0.98));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 40px 36px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), #38bdf8);
  color: #042f2e;
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 18px;
}

.login-card h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.5px;
}

.login-card .subtitle {
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 14px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 13px;
}

.form-control, .form-select {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}

.form-control:focus, .form-select:focus {
  border-color: rgba(45, 212, 191, 0.7);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 12px;
  padding: 11px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, opacity .15s ease, background .15s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #042f2e;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-danger {
  background: rgba(248, 113, 113, 0.15);
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.25);
}
.btn-sm { padding: 7px 12px; font-size: 13px; border-radius: 10px; }
.btn-block { width: 100%; }

.alert {
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 14px;
}
.alert-danger { background: rgba(248, 113, 113, 0.12); color: #fecaca; border: 1px solid rgba(248, 113, 113, 0.25); }
.alert-success { background: rgba(52, 211, 153, 0.12); color: #a7f3d0; border: 1px solid rgba(52, 211, 153, 0.25); }
.alert-info { background: rgba(56, 189, 248, 0.12); color: #bae6fd; border: 1px solid rgba(56, 189, 248, 0.25); }

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px 18px;
  background: rgba(10, 16, 28, 0.85);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 24px;
}

.sidebar-brand strong {
  display: block;
  font-size: 16px;
}

.sidebar-brand span {
  color: var(--text-muted);
  font-size: 12px;
}

.nav-link {
  display: block;
  padding: 12px 14px;
  margin-bottom: 6px;
  border-radius: 12px;
  color: var(--text-muted);
  transition: background .15s, color .15s;
}

.nav-link:hover, .nav-link.active {
  background: rgba(45, 212, 191, 0.12);
  color: var(--text);
}

.main {
  padding: 24px 28px 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.topbar h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
}

.topbar .meta {
  color: var(--text-muted);
  font-size: 14px;
}

.panel {
  background: linear-gradient(180deg, rgba(24, 35, 56, 0.88), rgba(18, 26, 43, 0.96));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  padding: 20px;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.stat-card .label {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 10px;
}

.stat-card .value {
  font-size: 32px;
  font-weight: 750;
  letter-spacing: 0.5px;
}

.toolbar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  align-items: center;
}

.table-wrap { overflow-x: auto; }

table.data-table {
  width: 100%;
  border-collapse: collapse;
}

table.data-table th,
table.data-table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 14px;
  white-space: nowrap;
}

table.data-table th {
  color: var(--text-muted);
  font-weight: 600;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge-success { background: rgba(52, 211, 153, 0.15); color: var(--success); }
.badge-danger { background: rgba(248, 113, 113, 0.15); color: var(--danger); }
.badge-info { background: rgba(45, 212, 191, 0.15); color: var(--accent); }

.pager {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  align-items: center;
}

.muted { color: var(--text-muted); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 12px; }
.mb-3 { margin-bottom: 18px; }
.mt-3 { margin-top: 18px; }
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 1100px) {
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: relative;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}