:root {
    /* --- Palette Modern & Accessible --- */
    --primary-color: #4f46e5;
    /* Indigo vibrant */
    --primary-dark: #4338ca;
    /* Darker indigo for hover */
    --secondary-color: #64748b;
    /* Slate for secondary actions */
    --accent-color: #f59e0b;
    /* Amber for emphasis */

    --bg-body: #f8fafc;
    /* Very light slate background */
    --bg-card: #ffffff;

    --text-main: #1e293b;
    /* Slate 800 - High contrast text */
    --text-muted: #64748b;
    /* Slate 500 */

    --border-color: #e2e8f0;
    /* Slate 200 */
    --border-radius: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 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);

    /* Navbar specifics */
    --nav-bg: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
    --nav-text: #ffffff;
    --nav-hover: rgba(255, 255, 255, 0.15);
}

body {
    font-family: 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Poppins', sans-serif;
    color: var(--text-main);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

/* --- Navigation --- */
.navbar {
    background: var(--nav-bg) !important;
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--nav-text) !important;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: var(--nav-hover);
    color: #fff !important;
    transform: translateY(-1px);
}

.nav-link.active {
    background-color: rgba(255, 255, 255, 0.2) !important;
    color: #fff !important;
    font-weight: 600;
}

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius);
    padding: 0.5rem;
    margin-top: 0.5rem !important;
}

.dropdown-item {
    border-radius: var(--border-radius-sm);
    padding: 0.6rem 1rem;
    font-weight: 500;
    color: var(--text-main);
}

.dropdown-item:hover {
    background-color: #eff6ff;
    color: var(--primary-color);
}

/* --- Cards --- */
.card {
    background-color: var(--bg-card);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
}

.card-body {
    padding: 1.5rem;
}

/* --- Tables (Cozy & Clean) --- */
.table-responsive {
    border-radius: var(--border-radius);
    overflow: hidden;
}

.table {
    margin-bottom: 0;
    font-size: 0.9rem;
    background-color: transparent;
}

.table thead th {
    background-color: #f1f5f9;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    border-top: none;
}

.table tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-card);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: #f8fafc;
}

.table-hover tbody tr:hover td {
    background-color: #eff6ff;
}

/* --- Buttons --- */
.btn {
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s;
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-secondary {
    background-color: #fff;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    color: var(--text-main);
    border-color: #cbd5e1;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* --- Forms --- */
.form-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.form-control,
.form-select {
    display: block;
    width: 100%;
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-main);
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.form-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --- Badges --- */
.badge {
    padding: 0.4em 0.8em;
    font-weight: 600;
    border-radius: 999px;
    /* Pill shape */
    font-size: 0.75em;
    letter-spacing: 0.025em;
}

.bg-success {
    background-color: #dcfce7 !important;
    color: #166534 !important;
}

.bg-danger {
    background-color: #fee2e2 !important;
    color: #991b1b !important;
}

.bg-warning {
    background-color: #fef3c7 !important;
    color: #92400e !important;
}

.bg-info {
    background-color: #e0f2fe !important;
    color: #075985 !important;
}

/* --- Alerts --- */
.alert {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    font-weight: 500;
}

.alert-success {
    background-color: #f0fdf4;
    color: #15803d;
    border-left: 4px solid #22c55e;
}

.alert-danger {
    background-color: #fef2f2;
    color: #b91c1c;
    border-left: 4px solid #ef4444;
}

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

.shadow-sm {
    box-shadow: var(--shadow-sm) !important;
}