:root {
    --primary: #2563eb;
    --secondary: #6c757d;
    --light: #f8fafc;
    --dark: #0f172a;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    color: #0f172a;
    background: #f1f5f9;
}

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

a:hover {
    text-decoration: underline;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--secondary);
    color: #fff;
}

.navbar a {
    color: #fff;
}

.navbar .btn-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #111827;
    color: #fff;
    border-radius: 6px;
    padding: 8px 0;
    min-width: 180px;
    z-index: 1000;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: block;
    padding: 6px 12px;
    color: #fff;
}

.container-fluid {
    width: 100%;
    padding: 0 16px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: -8px;
}

.row > [class^="col"] {
    padding: 8px;
}

.col-4 {
    flex: 0 0 33.3333%;
    max-width: 33.3333%;
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

.col-lg-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-lg-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
}

.card-title {
    font-weight: 700;
    margin-bottom: 8px;
}

.btn {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
}

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

.btn-outline-secondary {
    background: transparent;
    color: #475569;
    border-color: #94a3b8;
}

.btn-success {
    background: #16a34a;
}

.form-control {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid #cbd5f5;
    border-radius: 8px;
    font-size: 14px;
}

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

.table th,
.table td {
    border: 1px solid var(--border);
    padding: 8px;
    text-align: left;
}

.text-muted {
    color: #64748b;
}

.h4 {
    font-size: 20px;
    font-weight: 700;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    background: #e2e8f0;
    color: #0f172a;
    font-size: 12px;
    font-weight: 600;
}

@media (max-width: 900px) {
    .col-4,
    .col-6,
    .col-lg-6 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .navbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .navbar .btn-group {
        flex-wrap: wrap;
    }
}