:root {
    --primary: #0A6C74; 
    --gold: #D4A017; 
    --dark-bg: #1A202C; 
    --light-bg: #F8FAFC; 
    --text-dark: #1A202C;
    --text-light: #F8FAFC;
    --shadow: rgba(0, 0, 0, 0.3);
    --card-bg: #FFFFFF;
    --card-shadow-light: rgba(0, 0, 0, 0.1);
    --table-hover-light: #E2E8F0;
    --table-hover-dark: #4A5568;
    --danger: #EF4444;
}

@media (prefers-color-scheme: dark) {
    :root {
        --light-bg: #1A202C;
        --text-dark: #F8FAFC;
        --text-light: #1A202C;
        --card-bg: #2D3748;
        --card-shadow-light: rgba(0, 0, 0, 0.2);
    }
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--light-bg);
    color: var(--text-dark);
    transition: background 0.5s ease, color 0.5s ease; 
}

.navbar {
    background: linear-gradient(90deg, var(--primary) 0%, var(--dark-bg) 100%);
    box-shadow: 0 4px 12px var(--shadow);
    padding: 1rem 2rem;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--gold) !important;
    transition: transform 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

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

.nav-link {
    color: var(--text-light) !important;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    transition: all 0.3s ease;
    position: relative;
    text-decoration: none;
}

.nav-link:hover, .nav-link.active {
    color: var(--gold) !important;
    transform: scale(1.1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold);
    transition: width 0.3s ease;
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    transition: all 0.3s ease;
    font-weight: 600;
    color: var(--text-light) !important;
}

.btn-primary:hover {
    background: var(--gold);
    border-color: var(--gold);
    transform: scale(1.05);
    color: var(--text-dark) !important;
}

.btn-danger {
    background: var(--danger);
    border-color: var(--danger);
    color: var(--text-light) !important;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-danger:hover {
    background: var(--danger);
    border-color: var(--danger);
    transform: scale(1.05);
    color: var(--text-light) !important;
}

.card {
    border: none;
    border-radius: 12px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--dark-bg) 100%) ;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px var(--card-shadow-light);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px var(--shadow);
}

.table {
    border-radius: 8px;
    overflow: hidden;
}

.table th, .table td {
    vertical-align: middle;
    font-weight: 500;
    color: #333 !important;
}

.dark .table th, .dark .table td {
    color: var(--text-light);
}

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

.dark .table-hover tbody tr:hover {
    background: var(--table-hover-dark);
}

.notification {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    z-index: 2000;
    opacity: 0;
    transform: translateY(-20px);
    max-width: 400px;
    box-shadow: 0 8px 24px var(--shadow);
}

.notification.success {
    background: var(--gold);
    color: var(--text-dark);
}

.notification.error {
    background: var(--danger);
    color: var(--text-light);
}

.text-gold {
    color: var(--gold) !important;
    transition: color 0.3s ease;
}

.text-gold:hover {
    color: var(--text-light) !important;
}

.spinner {
    display: none;
    border: 4px solid var(--text-light);
    border-top: 4px solid var(--gold);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

.modal-content {
    border-radius: 12px;
    background: var(--card-bg);
    color: var(--text-dark);
}

.modal-header {
    border-bottom: 1px solid var(--text-dark);
}

.dark .modal-content {
    color: var(--text-light);
}

.dark .modal-header {
    border-bottom: 1px solid var(--text-light);
}

.form-control, .form-select {
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    font-weight: 500;
    background: var(--light-bg);
    border-color: var(--text-dark);
    color: var(--text-dark);
}

.form-control:focus, .form-select:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 0.2rem rgba(212, 160, 23, 0.25);
    transform: scale(1.02);
}

footer {
    background: var(--dark-bg);
    color: var(--text-light);
}

h1, h2, h3, .lead, .modal-title {
    font-weight: 700;
    color: var(--text-dark);
}

@media (max-width: 768px) {
    .navbar-nav {
        background: var(--primary);
        padding: 1rem;
        border-radius: 8px;
        margin-top: 0.5rem;
    }
    .nav-link {
        padding: 0.75rem;
        font-size: 1rem;
    }
    .btn-primary, .btn-danger {
        font-size: 1rem;
    }
}