:root {
    --primary: #4e73df;
    --primary-dark: #2e59d9;
    --success: #1cc88a;
    --info: #36b9cc;
    --warning: #f6c23e;
    --danger: #e74a3b;
    --secondary: #858796;
    --light: #f8f9fc;
    --dark: #5a5c69;
    --sidebar-bg: #1a1a2e;
    --sidebar-hover: #16213e;
    --sidebar-active: #0f3460;
    --body-bg: #f8f9fc;
    --card-bg: #fff;
    --text-primary: #3a3b45;
    --text-secondary: #858796;
    --border-color: #e3e6f0;
    --shadow: 0 0.15rem 1.75rem 0 rgba(58,59,69,.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--body-bg);
}

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

.sidebar {
    position: fixed;
    left: 0; top: 0;
    width: 220px;
    height: 100vh;
    background: var(--sidebar-bg);
    color: #fff;
    overflow-y: auto;
    z-index: 100;
    transition: all .3s;
}

.sidebar-brand {
    padding: 20px 15px;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,.1);
    color: #fff;
    display: block;
}

.sidebar-nav { padding: 10px 0; }

.nav-item {
    display: block;
    padding: 10px 20px;
    color: rgba(255,255,255,.7);
    font-size: 14px;
    transition: all .2s;
    cursor: pointer;
}

.nav-item:hover, .nav-item.active {
    color: #fff;
    background: var(--sidebar-hover);
}

.nav-item.active {
    background: var(--sidebar-active);
    border-left: 3px solid var(--primary);
}

.nav-item .nav-icon {
    margin-right: 8px;
    width: 20px;
    text-align: center;
}

.nav-group-title {
    padding: 10px 20px;
    font-size: 12px;
    text-transform: uppercase;
    color: rgba(255,255,255,.5);
    letter-spacing: 1px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    transition: color .2s, background .2s;
    border-radius: 4px;
    margin: 0 8px;
}

.nav-group-title:hover {
    color: rgba(255,255,255,.9);
    background: rgba(255,255,255,.05);
}

.nav-group-arrow {
    font-size: 12px;
    transition: transform .3s;
    display: inline-block;
}

.nav-group.collapsed .nav-group-arrow {
    transform: rotate(-90deg);
}

.nav-group-items {
    max-height: 500px;
    overflow: hidden;
    transition: max-height .35s ease-in-out;
}

.nav-group.collapsed .nav-group-items {
    max-height: 0;
}

.main-content {
    margin-left: 220px;
    min-height: 100vh;
}

.topbar {
    background: var(--card-bg);
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-title { font-size: 16px; font-weight: 600; }

.topbar-user {
    display: flex;
    align-items: center;
    gap: 15px;
}

.topbar-user .user-name { font-weight: 500; }

.page-content { padding: 25px; }

.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
}

.stat-card.success { border-left-color: var(--success); }
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.danger { border-left-color: var(--danger); }
.stat-card.info { border-left-color: var(--info); }

.stat-card .stat-title {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 5px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 { font-size: 16px; font-weight: 600; }

.card-body { padding: 20px; }

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

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

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

table th {
    background: var(--light);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
}

table tr:hover { background: var(--light); }

.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.bg-success { background: var(--success); color: #fff; }
.bg-warning { background: var(--warning); color: #fff; }
.bg-danger { background: var(--danger); color: #fff; }
.bg-secondary { background: var(--secondary); color: #fff; }
.bg-info { background: var(--info); color: #fff; }
.bg-primary { background: var(--primary); color: #fff; }

.btn {
    display: inline-block;
    padding: 6px 14px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: all .2s;
    text-align: center;
    line-height: 1.5;
}

.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: .9; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: .9; }
.btn-secondary { background: var(--secondary); color: #fff; }
.btn-info { background: var(--info); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-primary); }

.form-group { margin-bottom: 15px; }

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 13px;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color .2s;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(78,115,223,.25);
}

textarea.form-control { min-height: 100px; resize: vertical; }

select.form-control { cursor: pointer; }

.pagination {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.pagination a, .pagination span {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
}

.pagination .active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.filter-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.filter-bar .form-control { width: auto; min-width: 150px; }

.actions { display: flex; gap: 5px; flex-wrap: wrap; }

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
    width: 400px;
    max-width: 90%;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.login-box .form-group { margin-bottom: 20px; }

.login-box .btn {
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

.chart-container {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
}

.chart-container h4 {
    margin-bottom: 15px;
    font-size: 15px;
    color: var(--text-primary);
}

.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 200px;
    padding-top: 20px;
}

.bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    justify-content: flex-end;
}

.bar {
    width: 100%;
    max-width: 50px;
    background: var(--primary);
    border-radius: 4px 4px 0 0;
    min-height: 2px;
    transition: height .5s;
}

.bar-label {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 5px;
}

.bar-value {
    font-size: 11px;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 3px;
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,.5);
    z-index: 200;
    justify-content: center;
    align-items: center;
}

.modal-overlay.show { display: flex; }

.modal {
    background: #fff;
    border-radius: 8px;
    padding: 25px;
    width: 500px;
    max-width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal h3 { margin-bottom: 20px; }

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-secondary { color: var(--text-secondary); }

.mt-2 { margin-top: 10px; }
.mt-3 { margin-top: 15px; }
.mb-2 { margin-bottom: 10px; }
.mb-3 { margin-bottom: 15px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .sidebar .nav-item span:not(.nav-icon) { display: none; }
    .sidebar .nav-group-title { display: none; }
    .sidebar-brand { font-size: 14px; padding: 15px 5px; }
    .main-content { margin-left: 60px; }
    .stat-cards { grid-template-columns: 1fr 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
}