:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-light: #f8fafc;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --sidebar-width: 260px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
}

.d-flex {
    display: flex;
}

/* ---------------- Sidebar ---------------- */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: linear-gradient(180deg, #1e40af 0%, #2563eb 100%);
    color: white;
    position: fixed;
    left: 0;
    top: 0;
    padding: 0;
    z-index: 1000;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header i {
    font-size: 2rem;
}

.sidebar-header h5 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.sidebar-header small {
    font-size: 0.75rem;
    opacity: 0.8;
}

.sidebar-menu {
    padding: 1rem 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.sidebar-menu a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.sidebar-menu a.active {
    background-color: rgba(255, 255, 255, 0.15);
    border-left-color: white;
    color: white;
}

.sidebar-menu a i {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
}

/* ---------------- Main Content ---------------- */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
}

.top-bar {
    background: white;
    padding: 1.5rem 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.content-area {
    padding: 0rem !important;
}

/* ---------------- Cards ---------------- */
.stat-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.stat-card-header i {
    font-size: 1.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.stat-change {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

/* ---------------- Tables ---------------- */
.card {
    background: white;
    border-radius: 12px;
    border: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
}

.table {
    margin-bottom: 0;
}

.table thead th {
    border-bottom: 2px solid #e2e8f0;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 1rem 0.75rem;
}

.table tbody td {
    padding: 1rem 0.75rem;
    vertical-align: middle;
    border-bottom: 1px solid #f1f5f9;
}

.table-hover tbody tr:hover {
    background-color: #f8fafc;
}

/* ---------------- Buttons ---------------- */
.btn {
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-success {
    background-color: var(--success-color);
}

.btn-danger {
    background-color: var(--danger-color);
}

.badge {
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.8125rem;
}

/* ---------------- Form ---------------- */
.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    padding: 0.625rem 1rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.alert {
    border-radius: 8px;
    border: none;
}

/* ---------------- Responsive Fixes ---------------- */
@media (max-width: 768px) {

    .sidebar {
        width: 70px;
    }

    .sidebar-header h5,
    .sidebar-header small,
    .sidebar-menu a span {
        display: none;
    }

    .sidebar-header {
        justify-content: center;
    }

    .sidebar-menu a {
        justify-content: center;
        padding: 1rem;
    }

    .main-content {
        margin-left: 70px !important;
        width: calc(100% - 70px) !important;
    }

    .content-area {
        padding: 0 !important;
    }
}