:root {
  --bg: #f1f5f9;
  --sidebar-bg: #ffffff;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #16a34a;
  --accent-2: #2563eb;
  --danger: #dc2626;
  --warning: #d97706;
  --border: #e2e8f0;
  --active-bg: #eff6ff;
  --active-text: #2563eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Tahoma", sans-serif;
  background: var(--bg);
  color: var(--text);
}

a { color: var(--accent-2); }

/* ============================================================
   App shell: sidebar (ซ้าย) + main area (topbar + content)
   ============================================================ */

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-brand {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand .brand-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  margin: 0;
}

.sidebar-brand .version-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 7px;
  border-radius: 999px;
}

.sidebar-brand .brand-subtitle {
  font-size: 12px;
  color: var(--muted);
  margin: 4px 0 0;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.nav-section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 14px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 2px;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.nav-item:hover {
  background: var(--panel-2);
  text-decoration: none;
}

.nav-item.active {
  background: var(--active-bg);
  color: var(--active-text);
  font-weight: 600;
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px;
}

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

.sidebar-user .avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-2);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.sidebar-user .info {
  flex: 1;
  min-width: 0;
}

.sidebar-user .username {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user .role {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.sidebar-logout {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  color: var(--muted);
  font-size: 13px;
  border-radius: 8px;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.sidebar-logout:hover {
  background: var(--panel-2);
  color: var(--danger);
}

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.topbar h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}

.icon-btn:hover {
  color: var(--text);
  background: var(--panel-2);
}

main.content {
  padding: 24px 32px;
  flex: 1;
}

/* ============================================================
   Cards
   ============================================================ */

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card-header h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.stat-card .stat-label {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.stat-card .stat-value {
  font-size: 26px;
  font-weight: 700;
}

.stat-card.blue { background: #eff6ff; border-color: #bfdbfe; }
.stat-card.green { background: #f0fdf4; border-color: #bbf7d0; }

section { margin-bottom: 20px; }

h2 {
  font-size: 16px;
  color: var(--text);
  margin-bottom: 12px;
}

/* ============================================================
   Table
   ============================================================ */

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

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tr:last-child td { border-bottom: none; }

/* ============================================================
   Badges
   ============================================================ */

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.badge.online { background: #dcfce7; color: var(--accent); }
.badge.offline { background: var(--panel-2); color: var(--muted); }

.badge.status-Available { background: #dcfce7; color: var(--accent); }
.badge.status-Charging { background: #dbeafe; color: var(--accent-2); }
.badge.status-Faulted { background: #fee2e2; color: var(--danger); }

/* ============================================================
   Buttons
   ============================================================ */

button {
  background: var(--accent-2);
  color: white;
  border: none;
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  margin-right: 6px;
}

button.secondary { background: var(--panel); border: 1px solid var(--border); color: var(--text); }
button.danger { background: var(--danger); }

button:hover { filter: brightness(1.08); }

/* ============================================================
   Dialog
   ============================================================ */

dialog {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  min-width: 320px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.15);
}

dialog::backdrop {
  background: rgba(15, 23, 42, 0.4);
}

dialog label {
  display: block;
  margin: 10px 0;
  font-size: 13px;
  color: var(--muted);
}

dialog input {
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

dialog menu {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
  padding: 0;
}

/* ============================================================
   Auth pages (login/register) — centered card, ไม่มี sidebar
   ============================================================ */

.auth-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.auth-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 32px;
  font-size: 16px;
  font-weight: 700;
}

.auth-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.auth-card h2 {
  margin-top: 0;
}

.auth-footer-link {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* ============================================================
   Forms ทั่วไป (admin/settings/users/cards)
   ============================================================ */

.form-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.form-grid input[type="text"],
.form-grid input[type="password"],
.form-grid input[type="number"],
.form-grid input[type="email"],
.form-grid select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
}

.form-grid .checkbox-label {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.form-grid.inline-form {
  flex-direction: row;
  align-items: center;
}

.form-grid.inline-form input {
  flex: 1;
}

.form-error {
  color: var(--danger);
  font-size: 13px;
  margin: 0;
}

.form-msg {
  color: var(--accent);
  font-size: 13px;
  margin: 0;
}

footer.page-footer {
  text-align: center;
  padding: 16px;
  font-size: 12px;
  color: var(--muted);
}