:root {
    --sidebar-width: 250px;
    --sidebar-bg: #fff;
    --sidebar-border: #f0f0f0;
    --sidebar-text: #6c757d;
    --sidebar-text-hover: #5c6bc0;
    --sidebar-active-bg: #f0f2ff;
    --sidebar-active-color: #5c6bc0;
    --topbar-height: 50px;
    --content-bg: #f7f8fc;
    --primary: #5c6bc0;
    --primary-light: #e8eaf6;
    --primary-dark: #3f51b5;
    --text-dark: #333;
    --text-muted: #9e9e9e;
    --border-color: #eef0f4;
    --card-shadow: 0 1px 3px rgba(0,0,0,.04);
}

* { box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--content-bg);
    margin: 0;
    overflow-x: hidden;
    color: var(--text-dark);
    font-size: 14px;
}

.admin-wrapper { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.admin-sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 1050;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--sidebar-border);
    transition: transform .25s ease;
}

.sidebar-brand {
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 10px;
    border-bottom: 1px solid var(--sidebar-border);
}
.sidebar-brand i { font-size: 24px; color: var(--primary); }
.sidebar-brand span { font-size: 17px; font-weight: 700; color: var(--text-dark); letter-spacing: .5px; }

.sidebar-nav {
    flex: 1;
    padding: 8px 0;
    overflow-y: auto;
    overflow-x: hidden;
}
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: #ddd; border-radius: 4px; }

.sidebar-section { padding: 16px 20px 6px; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); font-weight: 600; }

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--sidebar-text);
    font-size: 14px;
    text-decoration: none;
    transition: all .15s;
    border-left: 3px solid transparent;
    margin: 1px 0;
}
.sidebar-nav .nav-link:hover {
    color: var(--sidebar-text-hover);
    background: var(--sidebar-active-bg);
}
.sidebar-nav .nav-link.active {
    color: var(--sidebar-active-color);
    background: var(--sidebar-active-bg);
    border-left-color: var(--sidebar-active-color);
    font-weight: 600;
}
.sidebar-nav .nav-link i { font-size: 17px; width: 20px; text-align: center; opacity: .7; }
.sidebar-nav .nav-link.active i { opacity: 1; }

.sidebar-footer {
    border-top: 1px solid var(--sidebar-border);
    padding: 8px 0;
}
.sidebar-footer a {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 20px; color: var(--sidebar-text); font-size: 13px;
    text-decoration: none; transition: color .15s;
}
.sidebar-footer a:hover { color: var(--primary); }

.sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.3); z-index: 1040;
}

/* ===== Main ===== */
.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.admin-topbar {
    height: var(--topbar-height);
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1020;
}
.admin-topbar .breadcrumb { margin-bottom: 0; font-size: 13px; }
.admin-topbar .breadcrumb-item a { color: var(--primary); text-decoration: none; }
.admin-topbar .breadcrumb-item.active { color: var(--text-muted); }

.avatar-sm {
    width: 30px; height: 30px; border-radius: 50%;
    background: var(--primary); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 600;
}

.admin-content { flex: 1; padding: 20px; }

/* ===== Cards ===== */
.card {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: var(--card-shadow);
    background: #fff;
}
.card-header {
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
    padding: 14px 20px;
    border-radius: 6px 6px 0 0 !important;
    color: var(--text-dark);
}
.card-body { padding: 20px; }

/* ===== Stat Cards ===== */
.stat-card {
    border-radius: 6px;
    padding: 20px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 16px;
    border: none;
}
.stat-card .stat-icon {
    width: 48px; height: 48px; border-radius: 10px;
    background: rgba(255,255,255,.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
}
.stat-card .stat-info .stat-label { font-size: 12px; opacity: .85; }
.stat-card .stat-info .stat-value { font-size: 24px; font-weight: 700; line-height: 1.3; }
.stat-card.bg-primary-g { background: linear-gradient(135deg, #5c6bc0, #3f51b5); }
.stat-card.bg-success-g { background: linear-gradient(135deg, #66bb6a, #43a047); }
.stat-card.bg-warning-g { background: linear-gradient(135deg, #ffa726, #fb8c00); }
.stat-card.bg-info-g { background: linear-gradient(135deg, #7e57c2, #5e35b1); }

/* ===== Tables ===== */
.table { margin-bottom: 0; }
.table thead th {
    background: #fafbfc;
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .5px;
    padding: 10px 14px;
    white-space: nowrap;
}
.table tbody td {
    padding: 10px 14px;
    vertical-align: middle;
    font-size: 13px;
    color: #555;
    border-color: var(--border-color);
}
.table-hover tbody tr:hover { background: #fafbfc; }

/* ===== Badges ===== */
.badge-light-success { background: #e8f5e9; color: #2e7d32; }
.badge-light-primary { background: #e8eaf6; color: #3f51b5; }
.badge-light-danger { background: #fce4ec; color: #c62828; }
.badge-light-warning { background: #fff3e0; color: #e65100; }
.badge-light-info { background: #ede7f6; color: #5e35b1; }

/* ===== Pagination ===== */
.pagination .page-link {
    border: none; color: var(--text-muted); font-size: 13px;
    padding: 5px 10px; border-radius: 4px; margin: 0 1px;
}
.pagination .page-item.active .page-link { background: var(--primary); color: #fff; }
.pagination .page-link:hover { background: var(--primary-light); color: var(--primary); }
.pagination .page-item.active .page-link:hover { background: var(--primary); color: #fff; }

/* ===== Forms ===== */
.form-label { font-size: 13px; font-weight: 500; color: #555; }
.form-control, .form-select { font-size: 13px; border-color: #dee2e6; }
.form-control:focus, .form-select:focus { border-color: var(--primary); box-shadow: 0 0 0 .15rem rgba(92,107,192,.15); }

/* ===== Switch ===== */
.form-switch .form-check-input { width: 40px; height: 20px; cursor: pointer; }
.form-switch .form-check-input:checked { background-color: var(--primary); border-color: var(--primary); }

/* ===== Buttons ===== */
.btn { font-size: 13px; }
.btn-primary { background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-light-primary { background: var(--primary-light); color: var(--primary); border: none; }
.btn-light-primary:hover { background: #d5d9f2; color: var(--primary-dark); }
.btn-light-danger { background: #fce4ec; color: #c62828; border: none; }
.btn-light-danger:hover { background: #f8d0d8; color: #b71c1c; }
.btn-light-success { background: #e8f5e9; color: #2e7d32; border: none; }
.btn-light-success:hover { background: #d4edda; color: #1b5e20; }

/* ===== Chart ===== */
.chart-container { position: relative; height: 250px; }

/* ===== Empty state ===== */
.empty-state { text-align: center; padding: 40px 20px; color: #bbb; }
.empty-state i { font-size: 42px; margin-bottom: 10px; display: block; }

/* ===== Toolbar ===== */
.toolbar-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }

/* ===== Page info ===== */
.page-info { font-size: 12px; color: var(--text-muted); }

/* ===== Progress Bars (user dashboard) ===== */
.progress { height: 8px; border-radius: 4px; background: #eee; }
.progress-bar { border-radius: 4px; }
.progress-bar.bg-indigo { background: var(--primary); }

/* ===== Upload Drop Zone ===== */
.drop-zone {
    border: 2px dashed #d5d9e2;
    border-radius: 8px;
    padding: 28px;
    text-align: center;
    color: #aaa;
    cursor: pointer;
    transition: all .2s;
    margin-bottom: 14px;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.drop-zone i { font-size: 36px; display: block; margin-bottom: 8px; }

/* ===== User info cards ===== */
.info-card {
    background: #fff; border: 1px solid var(--border-color);
    border-radius: 6px; padding: 16px 20px;
    box-shadow: var(--card-shadow);
}
.info-card .info-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.info-card .info-value { font-size: 15px; font-weight: 600; color: var(--text-dark); }

/* ===== Login Page ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #5c6bc0 50%, #7e57c2 100%);
    padding: 20px;
}
.login-box {
    width: 100%; max-width: 400px;
    background: #fff; border-radius: 10px;
    box-shadow: 0 15px 50px rgba(0,0,0,.15);
    padding: 40px;
}
.login-box h2 { text-align: center; font-size: 22px; font-weight: 700; color: var(--text-dark); margin-bottom: 8px; }
.login-box .subtitle { text-align: center; font-size: 13px; color: var(--text-muted); margin-bottom: 28px; }

/* ===== Tabs ===== */
.nav-tabs .nav-link { font-size: 14px; color: var(--sidebar-text); border: none; padding: 8px 16px; }
.nav-tabs .nav-link.active { color: var(--primary); border-bottom: 2px solid var(--primary); font-weight: 600; background: transparent; }
.nav-tabs .nav-link:hover { color: var(--primary); border-color: transparent; }

/* ===== SweetAlert ===== */
.swal2-popup { font-size: 14px !important; border-radius: 8px !important; }

/* ===== Responsive ===== */
@media (max-width: 991.98px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-sidebar.show { transform: translateX(0); }
    .sidebar-overlay.show { display: block; }
    .admin-main { margin-left: 0; }
}