/* Variable Definition */
:root {
    --primary-color: #2563eb;
    /* Blue 600 */
    --secondary-color: #3b82f6;
    /* Blue 500 */
    --tertiary-color: #60a5fa;
    /* Blue 400 */
    --accent-color: #ea580c;
    /* Orange 600 */
    --light-bg: #f8fafc;
    /* Slate 50 */
    --dark-bg: #0f172a;
    /* Slate 900 */
    --text-color: #334155;
    /* Slate 700 */
    --text-muted: #64748b;
    /* Slate 500 */
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.2s ease-in-out;
    --border-color: #e2e8f0;
    /* Slate 200 */
}

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

/* Sidebar Styling (Professional Light/Blue Combo) */
.sidebar {
    min-height: 100vh;
    background: var(--white);
    border-right: 1px solid var(--border-color);
    color: var(--text-color);
    transition: var(--transition);
    z-index: 1045;
}

/* Offcanvas adjustment for mobile */
@media (max-width: 767.98px) {
    .sidebar {
        min-height: auto;
        border-right: none;
        width: 280px !important;
    }
    .content-area {
        padding-top: 20px !important;
    }
}

.sidebar-header h4 {
    color: var(--primary-color) !important;
    font-weight: 700;
}

.sidebar-header small {
    color: var(--text-muted) !important;
}

.sidebar .nav-link {
    color: var(--text-muted);
    padding: 12px 20px;
    border-radius: 8px;
    margin: 4px 10px;
    transition: var(--transition);
    font-weight: 500;
    display: flex;
    align-items: center;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: var(--primary-color);
    background-color: #eff6ff;
    /* Blue 50 */
}

.sidebar .nav-link.active {
    font-weight: 600;
}

.sidebar .nav-link i {
    width: 25px;
    font-size: 1.1rem;
}

/* Main content area */
.content-area {
    background-color: var(--light-bg);
}

/* DataTables Custom Styles */
.datatable-responsive {
    width: 100% !important;
    border-collapse: collapse !important;
}

.datatable-responsive thead th {
    background-color: #f1f5f9;
    color: #475569;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.025em;
    border-bottom: 2px solid var(--border-color) !important;
}

/* Mobile adjustments for DataTables */
table.dataTable.dtr-inline.collapsed > tbody > tr > td.dtr-control:before, 
table.dataTable.dtr-inline.collapsed > tbody > tr > th.dtr-control:before {
    background-color: var(--primary-color) !important;
    border: 2px solid #fff !important;
    box-shadow: 0 0 3px rgba(0,0,0,0.2) !important;
}

/* Auth Layout Hero & Cards */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 60px 0;
}

.card-auth {
    max-width: 700px;
    margin: -50px auto 30px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--white);
}

.navbar-brand-auth {
    font-weight: bold;
    color: var(--text-color) !important;
}

/* Auth Sidebar (Split layout for Register) */
.auth-sidebar {
    background: linear-gradient(135deg, var(--primary-color), var(--tertiary-color));
    color: white;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-form {
    padding: 40px;
    background: white;
}

.form-control:focus,
.form-select:focus {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    border-color: var(--primary-color);
}

/* Dashboard Cards */
.dashboard-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: var(--white);
    overflow: hidden;
}

.dashboard-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

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

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

/* Portfolio Gallery */
.portfolio-item {
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.portfolio-item img {
    transition: var(--transition);
}

.portfolio-item:hover img {
    transform: scale(1.03);
}

/* Navbar */
.navbar-custom {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
}

/* Select2 Fixes for new theme */
.select2-container--default .select2-selection--single,
.select2-container--default .select2-selection--multiple {
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.select2-container--default .select2-selection--single {
    height: 38px;
    padding: 4px 0;
}

.select2-container--default.select2-container--focus .select2-selection--multiple,
.select2-container--default.select2-container--focus .select2-selection--single {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    top: 6px;
    right: 4px;
}

/* Typography elements */
.text-muted {
    color: var(--text-muted) !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}