:root {
    --primary-color: #0066cc;
    --secondary-color: #5856d6;
    --success-color: #34c759;
    --danger-color: #ff3b30;
    --warning-color: #ff9500;
    --dark-bg: #1c1c1e;
    --light-bg: #f2f2f7;
    --card-bg: #ffffff;
    --border-color: #d1d1d6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--light-bg);
    color: #1c1c1e;
    line-height: 1.6;
}

.navbar {
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 1rem 0;
}

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

.sidebar {
    background: var(--card-bg);
    min-height: calc(100vh - 76px);
    padding: 2rem 1rem;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
}

.sidebar .nav-link {
    padding: 0.8rem 1.2rem;
    margin-bottom: 0.5rem;
    border-radius: 10px;
    color: #3a3a3c;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.sidebar .nav-link:hover {
    background: var(--light-bg);
    color: var(--primary-color);
    transform: translateX(5px);
}

.sidebar .nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.25rem;
    font-weight: 600;
    border: none;
}

.btn {
    padding: 0.6rem 1.5rem;
    border-radius: 10px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,102,204,0.4);
}

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

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

.table {
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

.table thead {
    background: var(--light-bg);
}

.table td, .table th {
    vertical-align: middle;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

.form-control, .form-select {
    border-radius: 10px;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0,102,204,0.25);
}

.modal-content {
    border-radius: 15px;
    border: none;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px 15px 0 0;
}

.alert {
    border-radius: 10px;
    border: none;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.domain-card {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.dns-record {
    background: var(--light-bg);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.record-type {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-card {
    background: white;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    max-width: 450px;
    width: 100%;
}

@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
    }
}