:root {
    --primary-color: #0066cc;
    --primary-dark: #0052a3;
    --primary-light: #e6f0ff;
    --secondary-color: #6c757d;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --spacing-unit: 8px;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-light);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header.navbar-section {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
    background-color: var(--bg-white) !important;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) / 2);
    color: var(--primary-color) !important;
    text-decoration: none;
    transition: var(--transition);
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 0.75rem;
    color: white;
    font-size: 1.25rem;
}

.brand-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

.nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 0.5rem;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
}

    .nav-link:hover {
        background-color: var(--primary-light);
        color: var(--primary-color) !important;
    }

    .nav-link.active {
        color: var(--primary-color) !important;
        background-color: var(--primary-light);
    }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 40%;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

.dropdown-menu {
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
}

.dropdown-item {
    padding: 0.75rem 1.25rem;
    color: var(--text-primary);
    transition: var(--transition);
    border-left: 3px solid transparent;
}

    .dropdown-item:hover {
        background-color: var(--primary-light);
        color: var(--primary-color);
        border-left-color: var(--primary-color);
    }

    .dropdown-item.disabled {
        color: var(--text-secondary);
        cursor: not-allowed;
        opacity: 0.5;
    }

.btn {
    font-weight: 600;
    border-radius: 0.5rem;
    transition: var(--transition);
    padding: 0.625rem 1.25rem;
    border: none;
    box-shadow: none;
}

    .btn:focus {
        box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1) !important;
    }

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

    .btn-primary:hover {
        background-color: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

.btn-outline-primary {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    background-color: transparent;
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

main.main-content {
    flex: 1;
    background-color: var(--bg-light);
}

.container-lg {
    max-width: 1200px;
}

footer.footer {
    background-color: var(--bg-white);
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

footer a:hover {
    color: var(--primary-color) !important;
}

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }

    .brand-icon {
        width: 2rem;
        height: 2rem;
        font-size: 1rem;
    }

    .nav-link {
        padding: 0.75rem 0 !important;
    }

        .nav-link.active::after {
            bottom: -6px;
        }

    .navbar-nav {
        margin-top: 1rem;
        border-top: 1px solid var(--border-color);
        padding-top: 1rem;
    }

    .border-start-md {
        border-left: none !important;
    }

    .ps-md-3 {
        padding-left: 0 !important;
    }

    .gap-md-2 {
        gap: 0 !important;
    }

    .d-md-inline {
        display: none !important;
    }

    .flex-md-row {
        flex-direction: column !important;
    }

    .text-md-end {
        text-align: left !important;
    }

    footer .row {
        text-align: center;
    }

    footer .col-md-6:last-child {
        margin-top: 1rem;
    }
}

@media (min-width: 768px) {
    .border-start-md {
        border-left: 1px solid var(--border-color) !important;
    }

    .ps-md-3 {
        padding-left: 1rem !important;
    }

    .gap-md-2 {
        gap: 0.5rem !important;
    }

    .d-md-inline {
        display: inline !important;
    }

    .flex-md-row {
        flex-direction: row !important;
    }

    .text-md-end {
        text-align: right !important;
    }

    .align-items-md-center {
        align-items: center !important;
    }
}

.btn:focus,
.btn:active:focus,
.btn-link.nav-link:focus,
.form-control:focus,
.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
    outline: none;
}

.form-control {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    transition: var(--transition);
    font-size: 1rem;
}

    .form-control:focus {
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
    }

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.alert {
    border: none;
    border-radius: 0.75rem;
    border-left: 4px solid;
}

.alert-success {
    background-color: #ecfdf5;
    color: #065f46;
    border-left-color: var(--success-color);
}

.alert-danger {
    background-color: #fef2f2;
    color: #7f1d1d;
    border-left-color: var(--error-color);
}

.alert-warning {
    background-color: #fffbeb;
    color: #78350f;
    border-left-color: var(--warning-color);
}

.alert-info {
    background-color: #eff6ff;
    color: #0c2340;
    border-left-color: var(--primary-color);
}

.badge {
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-weight: 600;
}

.breadcrumb {
    background-color: transparent;
    padding: 0;
    margin-bottom: 1rem;
}

.breadcrumb-item {
    color: var(--text-secondary);
}

    .breadcrumb-item.active {
        color: var(--text-primary);
    }

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

        .breadcrumb-item a:hover {
            text-decoration: underline;
        }

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

.table {
    background-color: var(--bg-white);
    border-collapse: collapse;
}

    .table thead th {
        background-color: var(--bg-light);
        border-bottom: 2px solid var(--border-color);
        color: var(--text-primary);
        font-weight: 600;
        text-transform: uppercase;
        font-size: 0.875rem;
        padding: 1rem;
    }

    .table tbody td {
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .table tbody tr:hover {
        background-color: var(--primary-light);
    }

.modal-content {
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.modal-header {
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-weight: 700;
    color: var(--text-primary);
}

html {
    position: relative;
    min-height: 100%;
}

body {
    margin-bottom: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

.py-4 {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.mt-5 {
    margin-top: 3rem;
}

.tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    border-bottom: 2px solid #e0e0e0;
}

    .tabs .tab {
        text-decoration: none;
        padding: 10px 20px;
        font-weight: 500;
        color: #555;
        border-radius: 5px 5px 0 0;
        transition: all 0.2s ease;
        position: relative;
    }

        .tabs .tab:hover {
            background-color: #f0f0f0;
            color: #007bff;
        }

        .tabs .tab.active {
            color: #007bff;
            font-weight: 600;
            background-color: #fff;
            border: 2px solid #007bff;
            border-bottom: none;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

            .tabs .tab.active::after {
                content: '';
                position: absolute;
                bottom: -2px;
                left: 0;
                width: 100%;
                height: 3px;
                background-color: #007bff;
                border-radius: 3px 3px 0 0;
            }