:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --border: #e4e8f0;
  --text: #1a2238;
  --text-muted: #6b7693;
  --primary: #2c5cff;
  --primary-hover: #1f47cc;
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --shadow: 0 1px 2px rgba(20, 30, 60, 0.04), 0 1px 3px rgba(20, 30, 60, 0.06);
  --shadow-lg: 0 4px 6px -1px rgba(20, 30, 60, 0.07), 0 2px 4px -2px rgba(20, 30, 60, 0.06);
  --radius: 10px;
  --sidebar-w: 240px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  font: inherit;
  cursor: pointer;
}

/* ---------------- Login page ---------------- */
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: linear-gradient(135deg, #eef2ff 0%, #f0f9ff 100%);
}
.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  padding: 36px 32px;
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
}
.login-logo {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}
.login-logo img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  filter: drop-shadow(0 6px 16px rgba(200, 16, 46, 0.18));
}
.login-card h1 {
  margin: 0 0 6px;
  font-size: 22px;
  text-align: center;
}
.login-card .sub {
  margin: 0 0 28px;
  color: var(--text-muted);
  text-align: center;
  font-size: 13px;
}
.login-card .field { margin-bottom: 16px; }
.login-card label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}
.login-card input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: #fbfcfe;
  outline: none;
}
.login-card input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(44, 92, 255, 0.12);
}
.login-card button {
  width: 100%;
  margin-top: 8px;
  padding: 11px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}
.login-card button:hover:not(:disabled) { background: var(--primary-hover); }
.login-card button:disabled { opacity: 0.6; cursor: not-allowed; }
.login-card .error {
  background: #fef2f2;
  color: var(--danger);
  padding: 10px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  border: 1px solid #fecaca;
}

/* ---------------- App layout ---------------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: #1a2238;
  color: #c4cae0;
  padding: 20px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar .brand {
  padding: 0 22px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 16px;
}
.sidebar .brand-title {
  font-size: 16px;
  font-weight: 700;
  color: white;
  letter-spacing: 0.3px;
}
.sidebar .brand-sub {
  font-size: 11px;
  color: #8990ab;
  margin-top: 2px;
}
.sidebar nav { display: flex; flex-direction: column; gap: 2px; padding: 0 12px; }
.sidebar a.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  color: #c4cae0;
  font-size: 14px;
  text-decoration: none;
}
.sidebar a.nav-item:hover { background: rgba(255, 255, 255, 0.06); color: white; text-decoration: none; }
.sidebar a.nav-item.active { background: var(--primary); color: white; }
.sidebar .nav-section {
  font-size: 11px;
  text-transform: uppercase;
  color: #6b7693;
  padding: 14px 12px 6px;
  letter-spacing: 0.5px;
}
.sidebar .user-box {
  margin-top: auto;
  padding: 14px 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  position: absolute;
  bottom: 0;
  width: 100%;
}
.sidebar .user-name { font-size: 13px; font-weight: 600; color: white; }
.sidebar .user-role { font-size: 11px; color: #8990ab; margin-top: 2px; }
.sidebar .user-box button {
  margin-top: 10px;
  width: 100%;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.15);
  color: #c4cae0;
  padding: 7px;
  border-radius: 7px;
  font-size: 12px;
}
.sidebar .user-box button:hover { background: rgba(255,255,255,0.08); color: white; }

/* ---------------- Main content ---------------- */
.main { padding: 28px 36px; }
.main h1 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
}
.main .page-sub {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 28px;
}

/* Cards grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.stat-card .label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  font-weight: 500;
}
.stat-card .value {
  font-size: 28px;
  font-weight: 700;
  margin-top: 6px;
  color: var(--text);
}
.stat-card .delta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}
.stat-card.primary .value { color: var(--primary); }
.stat-card.success .value { color: var(--success); }
.stat-card.warning .value { color: var(--warning); }

/* Chart cards */
.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}
.chart-grid.two { grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); }
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.chart-card .chart-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}
.chart-card .chart-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.chart-card .chart-wrap {
  position: relative;
  height: 260px;
}
.chart-card.full { grid-column: 1 / -1; }
.chart-card.full .chart-wrap { height: 320px; }

/* Tables */
.toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.toolbar input[type="search"], .toolbar input[type="text"], .toolbar select {
  padding: 8px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  background: var(--surface);
  outline: none;
  min-width: 200px;
}
.toolbar input:focus, .toolbar select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(44, 92, 255, 0.10);
}

.btn {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.btn:hover { background: #f8fafc; }
.btn-primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { border-color: var(--border); }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.data th {
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.3px;
  padding: 12px 16px;
  background: #fafbfd;
  border-bottom: 1px solid var(--border);
}
table.data td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
table.data tr:last-child td { border-bottom: none; }
table.data tr:hover { background: #fafbff; }

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
}
.badge-admin { background: #ede9fe; color: #6d28d9; }
.badge-operator { background: #dbeafe; color: #1d4ed8; }
.badge-active { background: #d1fae5; color: #047857; }
.badge-inactive { background: #fee2e2; color: #b91c1c; }

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 30, 60, 0.5);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 100;
}
.modal {
  background: var(--surface);
  border-radius: 12px;
  padding: 24px;
  width: 100%;
  max-width: 460px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}
.modal h2 { margin: 0 0 16px; font-size: 18px; }
.modal .field { margin-bottom: 14px; }
.modal label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 5px;
}
.modal input, .modal select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 13px;
  background: #fbfcfe;
  outline: none;
}
.modal input:focus, .modal select:focus {
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(44, 92, 255, 0.10);
}
.modal .actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}
.modal .error {
  background: #fef2f2;
  color: var(--danger);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12px;
  margin-bottom: 12px;
  border: 1px solid #fecaca;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 14px;
}
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 13px;
}

/* Mobile */
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: relative;
    height: auto;
    padding: 12px 0;
  }
  .sidebar nav { flex-direction: row; flex-wrap: wrap; gap: 4px; padding: 0 12px; }
  .sidebar a.nav-item { padding: 7px 11px; font-size: 13px; }
  .sidebar .brand { padding-bottom: 12px; }
  .sidebar .user-box { position: relative; }
  .main { padding: 16px; }
}