:root {
    --bg: #f4f6f8;
    --surface: #ffffff;
    --border: #dee2e6;
    --primary: #0d6efd;
    --primary-dark: #0b5ed7;
    --danger: #dc3545;
    --success: #198754;
    --warning: #ffc107;
    --info: #0dcaf0;
    --secondary: #6c757d;
    --text: #212529;
    --text-muted: #6c757d;
    --sidebar-w: 220px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
       font-size: 14px; background: var(--bg); color: var(--text); display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar { width: var(--sidebar-w); background: #1e293b; color: #94a3b8; flex-shrink: 0;
           display: flex; flex-direction: column; position: fixed; top: 0; left: 0; height: 100vh; overflow-y: auto; }
.sidebar-brand { padding: 18px 20px; font-size: 15px; font-weight: 700; color: #f1f5f9;
                 border-bottom: 1px solid #334155; line-height: 1.3; }
.sidebar-brand small { display: block; font-size: 11px; font-weight: 400; color: #64748b; margin-top: 2px; }
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a { display: flex; align-items: center; gap: 10px; padding: 9px 20px;
                 color: #94a3b8; text-decoration: none; font-size: 13.5px; transition: all .15s; }
.sidebar nav a:hover, .sidebar nav a.active { color: #f1f5f9; background: #334155; }
.sidebar nav a.active { color: #fff; font-weight: 600; }
.sidebar-footer { padding: 14px 20px; border-top: 1px solid #334155; font-size: 12px; color: #64748b; }
.sidebar-footer a { color: #94a3b8; text-decoration: none; }

/* Main content */
.main { margin-left: var(--sidebar-w); flex: 1; display: flex; flex-direction: column; min-height: 100vh; }
.topbar { background: var(--surface); border-bottom: 1px solid var(--border);
          padding: 14px 28px; display: flex; align-items: center; justify-content: space-between; }
.topbar h1 { font-size: 18px; font-weight: 600; }
.content { padding: 24px 28px; flex: 1; }

/* Cards */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
        padding: 20px; margin-bottom: 20px; }
.card-header { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
               color: var(--text-muted); margin-bottom: 14px; padding-bottom: 10px;
               border-bottom: 1px solid var(--border); }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; margin-bottom: 20px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
             padding: 16px 20px; }
.stat-card .label { font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-muted); }
.stat-card .value { font-size: 26px; font-weight: 700; margin-top: 4px; }
.stat-card .value.danger { color: var(--danger); }
.stat-card .value.warning { color: #d97706; }
.stat-card .value.success { color: var(--success); }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 8px 10px; font-size: 11px; text-transform: uppercase;
     letter-spacing: .04em; color: var(--text-muted); background: var(--bg);
     border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8f9fa; }
.text-muted { color: var(--text-muted); }
.mono { font-family: 'SFMono-Regular', Consolas, monospace; font-size: 12px; }

/* Badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info { background: #e0f2fe; color: #075985; }
.badge-secondary { background: #f3f4f6; color: #374151; }

/* Forms / buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border: none;
       border-radius: 6px; font-size: 13px; font-weight: 500; cursor: pointer; text-decoration: none;
       transition: background .15s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: #e5e7eb; color: var(--text); }
.btn-secondary:hover { background: #d1d5db; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
input[type=text], input[type=password], select {
    padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px;
    font-size: 13px; width: 100%; background: var(--surface); }
input[type=text]:focus, input[type=password]:focus, select:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(13,110,253,.15); }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 12px; font-weight: 600; margin-bottom: 5px; }
.form-row { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 120px; }

/* Alerts */
.alert { padding: 10px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 13px; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-info { background: #e0f2fe; color: #075985; border: 1px solid #bae6fd; }

/* Pagination */
.pagination { display: flex; gap: 4px; margin-top: 14px; }
.pagination a, .pagination span { padding: 5px 11px; border: 1px solid var(--border); border-radius: 5px;
    font-size: 13px; text-decoration: none; color: var(--text); background: var(--surface); }
.pagination a:hover { background: var(--bg); }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Login */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); }
.login-box { background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
             padding: 36px 40px; width: 100%; max-width: 380px; }
.login-box h1 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.login-box p { color: var(--text-muted); font-size: 13px; margin-bottom: 24px; }