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

:root {
    --primary: #0066cc;
    --primary-hover: #0052a3;
    --success: #00a651;
    --danger: #d32f2f;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e0e0e0;
    --gray-300: #d0d0d0;
    --gray-400: #999;
    --gray-500: #666;
    --gray-600: #444;
    --gray-700: #333;
    --gray-800: #222;
    --gray-900: #111;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.4;
    color: var(--gray-800);
    background: var(--gray-50);
}

.container {
    padding: var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
}

/* Compact Header */
header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
}

header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
}

.subtitle {
    color: var(--gray-500);
    font-size: 13px;
}

/* Compact Form */
.query-form {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 4px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-section {
    margin-bottom: 0;
}

.form-section h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Compact Inputs */
.hostname-textarea,
.nameserver-textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--gray-300);
    border-radius: 3px;
    font-size: 13px;
    font-family: 'SF Mono', Consolas, monospace;
    resize: vertical;
    min-height: 60px;
}

.hostname-textarea:focus,
.nameserver-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.1);
}

/* Compact Type Select */
.type-select,
.resolver-select-inline {
    padding: 6px var(--spacing-sm);
    border: 1px solid var(--gray-300);
    border-radius: 3px;
    font-size: 13px;
    background: white;
    cursor: pointer;
}

.type-select {
    width: 150px;
}

.resolver-select-inline {
    width: 200px;
    margin-left: var(--spacing-sm);
}

/* Inline Radio Group */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.radio-option {
    display: flex;
    align-items: center;
    font-size: 13px;
    color: var(--gray-700);
    cursor: pointer;
    padding: 0;
    background: none;
    border: none;
}

.radio-option input[type="radio"] {
    width: 16px;
    height: 16px;
    margin-right: 6px;
}

.radio-option span {
    margin-right: 0;
}

/* Compact Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.option-label {
    display: flex;
    align-items: center;
    padding: 4px;
    font-size: 12px;
    background: none;
    border: none;
    cursor: pointer;
}

.option-label input[type="checkbox"] {
    width: 14px;
    height: 14px;
    margin-right: 6px;
}

/* Compact Form Actions */
.form-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.submit-btn,
.clear-btn,
.share-btn {
    padding: 6px 16px;
    border: none;
    border-radius: 3px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.submit-btn:hover {
    background: #008a42;
}

.clear-btn,
.share-btn {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.clear-btn:hover,
.share-btn:hover {
    background: var(--gray-200);
}

/* Compact Results */
.results {
    margin-bottom: var(--spacing-md);
}

.result-block {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 3px;
    margin-bottom: var(--spacing-sm);
}

.result-header {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    cursor: pointer;
}

.result-header h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.result-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-header-top h3 {
    margin: 0;
}

.result-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.result-meta {
    font-size: 12px;
    color: var(--gray-600);
    margin-top: 2px;
}

.command-line {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--gray-800);
    padding: var(--spacing-sm);
    border-radius: 3px;
    margin-top: var(--spacing-sm);
    font-size: 11px;
}

.command-line code {
    flex: 1;
    color: #66ff66;
    font-family: 'SF Mono', Consolas, monospace;
    white-space: pre-line;
    word-break: break-all;
    line-height: 1.2;
}

.result-content {
    padding: var(--spacing-sm);
    max-height: 300px;
    overflow-y: auto;
    position: relative;
}

/* Compact DNS Output */
.dns-output {
    background: var(--gray-900);
    color: #e0e0e0;
    padding: var(--spacing-sm);
    border-radius: 2px;
    font-family: 'SF Mono', Consolas, monospace;
    font-size: 12px;
    line-height: 1.3;
    white-space: pre;
    overflow-x: auto;
}

.dns-output .comment { color: #666; }
.dns-output .domain { color: #99ccff; }
.dns-output .ttl { color: #999; }
.dns-output .class { color: #cc99ff; }
.dns-output .record-a { color: #66ff66; }
.dns-output .record-aaaa { color: #ff66ff; }
.dns-output .record-mx { color: #ff6666; }
.dns-output .record-cname { color: #ffcc66; }
.dns-output .record-ns { color: #66ccff; }
.dns-output .record-ptr { color: #66ffcc; }
.dns-output .record-soa { color: #ff9966; }
.dns-output .record-txt { color: #99ff66; }

.dns-output .ip-address {
    color: #ff9999;
    font-weight: 600;
}

.clickable-ip {
    color: #ffaa99 !important;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 1px dotted #ffaa99;
    padding: 1px 2px;
    margin: -1px -2px;
    border-radius: 2px;
}

.clickable-domain {
    color: #aaccff !important;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 1px dotted #aaccff;
    padding: 1px 2px;
    margin: -1px -2px;
    border-radius: 2px;
}

.clickable-ip:hover,
.clickable-domain:hover {
    background: rgba(255, 255, 255, 0.3);
    border-bottom-color: transparent;
    color: #fff !important;
}

/* Multi-nameserver results */
.multi-nameserver-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nameserver-result {
    border-bottom: 1px solid var(--gray-700);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.nameserver-result:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.nameserver-label {
    font-size: 11px;
    color: var(--gray-400);
    margin-bottom: 4px;
}

.nameserver-label strong {
    color: #66b3ff;
}

/* Compact Footer */
footer {
    text-align: center;
    color: var(--gray-500);
    font-size: 11px;
    padding: var(--spacing-md);
}

footer kbd {
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    padding: 2px 4px;
    border-radius: 2px;
    font-family: monospace;
    font-size: 10px;
}

footer p {
    margin: 0 0 var(--spacing-xs) 0;
}

footer p:last-child {
    margin-top: var(--spacing-md);
    margin-bottom: 0;
}

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

footer a:hover {
    text-decoration: underline;
}

/* Form Help Text */
.form-help {
    font-size: 11px;
    color: var(--gray-500);
    margin-top: 4px;
}

.form-help::before {
    content: '';
}

/* Error Styles */
.error {
    background: #ffebee;
    border: 1px solid #ffcdd2;
    color: var(--danger);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 3px;
    margin-bottom: var(--spacing-md);
    font-size: 13px;
}

.error h3 {
    font-size: 14px;
    margin-bottom: 4px;
}

/* Responsive */
@media (max-width: 968px) {
    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .form-actions {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 4px;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
}

/* Remove unnecessary elements */
.submit-btn::before,
.form-help::before,
.result-meta::before,
.error::before {
    display: none;
}

/* Result Header Layout */
.result-header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.result-header-top h3 {
    margin: 0;
    flex: 1;
}

.result-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* Copy Buttons */
.copy-btn {
    padding: 4px 8px;
    font-size: 11px;
    background: var(--gray-700);
    color: var(--gray-100);
    border: 1px solid var(--gray-600);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.copy-btn:hover {
    background: var(--gray-600);
    color: white;
}

/* Utility Classes */
.optional {
    color: var(--gray-400);
    font-size: 11px;
    font-weight: normal;
}

/* Focus visible */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
}

/* Loading States */
.loading-spinner {
    display: inline-block;
    animation: spin 1s linear infinite;
    font-size: 16px;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.loading-message {
    color: var(--gray-500);
    font-style: italic;
    padding: var(--spacing-md);
    text-align: center;
}

/* All Resolvers Results */
.all-resolvers-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.resolver-group {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-sm);
}

.resolver-group:first-child {
    border-top: none;
    padding-top: 0;
}

.resolver-group h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-400);
    margin-bottom: var(--spacing-sm);
}

/* Loading spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* AJAX results container */
.results-ajax .result-block {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* Hostname Group Styles */
.hostname-group {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 3px;
    margin-bottom: var(--spacing-md);
}

.hostname-group-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hostname-group-header h3 {
    color: var(--gray-800);
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.hostname-group-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.nameserver-results {
    padding: 0;
}

.nameserver-result {
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 0;
}

.nameserver-result:last-child {
    border-bottom: none;
}

.nameserver-header {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nameserver-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 12px;
    color: var(--gray-600);
}

.nameserver-info strong {
    color: var(--gray-800);
}

.nameserver-ip {
    font-family: monospace;
    font-size: 11px;
}

.loading-indicator {
    font-size: 11px;
    color: var(--primary);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.nameserver-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.nameserver-actions .copy-btn {
    font-size: 11px;
    padding: 4px 8px;
}

.nameserver-content {
    padding: var(--spacing-md);
}

.nameserver-content .command-line {
    margin-bottom: var(--spacing-sm);
}

.nameserver-result .error {
    margin: var(--spacing-md);
    background: #ffebee;
    border: 1px solid #ffcdd2;
    color: var(--danger);
    padding: var(--spacing-md);
    border-radius: 3px;
    font-size: 12px;
}