:root {
    --lk-bg: #f3f6fb;
    --lk-surface: #ffffff;
    --lk-surface-soft: #f8fbff;
    --lk-border: #d9e0ee;
    --lk-text: #1d2a3b;
    --lk-muted: #637084;
    --lk-primary: #0f6fda;
    --lk-primary-dark: #0c61be;
    --lk-success: #1f9d62;
    --lk-danger: #c13d3d;
    --lk-shadow: 0 12px 30px rgba(18, 33, 64, 0.08);
    --lk-radius: 14px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", Tahoma, sans-serif;
    color: var(--lk-text);
    background: var(--lk-bg);
    line-height: 1.45;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--lk-text);
    font-weight: 700;
}

p, label, span, small {
    color: inherit;
}

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

a:hover {
    color: var(--lk-primary-dark);
}

.main-content,
.container-fluid,
.container {
    color: var(--lk-text);
}

.card {
    background: var(--lk-surface);
    border: 1px solid var(--lk-border);
    border-radius: var(--lk-radius);
    box-shadow: var(--lk-shadow);
    overflow: hidden;
}

.card-header {
    background: var(--lk-surface-soft);
    border-bottom: 1px solid var(--lk-border);
}

.navbar-brand {
    font-weight: 700;
}

.navbar-main,
.page_header,
.navbar {
    box-shadow: 0 8px 24px rgba(18, 33, 64, 0.06);
}

.btn {
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.btn-primary,
.bg-gradient-primary {
    background-color: var(--lk-primary) !important;
    border-color: var(--lk-primary) !important;
    color: #fff !important;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--lk-primary-dark) !important;
    border-color: var(--lk-primary-dark) !important;
}

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

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

.form-control,
.form-select,
.input-group-outline .form-control,
textarea {
    border-color: var(--lk-border);
    border-radius: 10px;
    color: var(--lk-text);
    background: var(--lk-surface);
}

.form-control:focus,
.form-select:focus,
textarea:focus {
    border-color: var(--lk-primary);
    box-shadow: 0 0 0 0.2rem rgba(15, 111, 218, 0.15);
}

::placeholder {
    color: #8c97aa;
}

.table {
    color: var(--lk-text);
    border-color: var(--lk-border);
}

table.table thead th {
    background: #eef3fb;
    color: var(--lk-text);
    border-bottom: 1px solid var(--lk-border);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.35px;
    font-size: 0.79rem;
}

table.table tbody tr {
    border-bottom: 1px solid #edf1f7;
}

table.table tbody tr:nth-child(even),
.table-striped tbody tr:nth-of-type(even) {
    background: #fafcff;
}

.badge,
.btn-sm {
    border-radius: 8px;
}

.alert {
    border-radius: 12px;
    border: 1px solid var(--lk-border);
}

.sidenav .nav-link {
    border-radius: 10px;
    margin-bottom: 4px;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.sidenav .nav-link:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateX(2px);
}

.sidenav .nav-link.active,
.sidenav .nav-item.active > .nav-link {
    background: rgba(255, 255, 255, 0.2);
}

.lk-page-title {
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: 0.2px;
}

.lk-page-subtitle {
    font-size: 0.95rem;
    color: var(--lk-muted);
}

.lk-surface {
    background: var(--lk-surface);
    border: 1px solid var(--lk-border);
    border-radius: var(--lk-radius);
    box-shadow: var(--lk-shadow);
}

.lk-section {
    margin-bottom: 1rem;
    padding: 1rem 1.15rem;
}

.lk-hero-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    padding: 0.95rem 1.1rem;
    background: linear-gradient(120deg, #ffffff 0%, #edf4ff 100%);
    border: 1px solid var(--lk-border);
    border-radius: var(--lk-radius);
}

.lk-muted {
    color: var(--lk-muted) !important;
}

@media (max-width: 991px) {
    .container-fluid {
        padding-left: 0.85rem;
        padding-right: 0.85rem;
    }

    .lk-page-title {
        font-size: 1.25rem;
    }
}