:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #16a34a;
    --warning-color: #d97706;
    --error-color: #dc2626;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
}

.tab-button:hover {
    color: var(--text-primary);
}

.tab-button.active {
    color: var(--primary-color);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.test-section {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.test-results {
    margin: 20px 0;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

.label {
    font-weight: 500;
    color: var(--text-secondary);
}

.value {
    font-weight: 500;
    color: var(--text-primary);
}

.test-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.test-button:hover {
    background-color: var(--primary-hover);
}

.test-button:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
}

.test-button.primary {
    background-color: var(--success-color);
    padding: 12px 24px;
}

.test-button.primary:hover {
    background-color: #15803d;
}

.test-button.secondary {
    background: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 12px 24px;
}

.test-button.secondary:hover {
    background: var(--primary-color);
    color: white;
}

.export-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.share-result {
    background: #f0f9ff;
    border: 1px solid #93c5fd;
    border-radius: 6px;
    padding: 16px;
}

.share-url-container {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.share-url-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.875rem;
}

.copy-button {
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.copy-button:hover {
    background: var(--primary-hover);
}

.copy-button.copied {
    background: var(--success-color);
}

.test-button:disabled {
    opacity: 0.6;
    cursor: wait;
}

.port-table {
    width: 100%;
    border-collapse: collapse;
}

.port-table th,
.port-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.port-table th {
    font-weight: 600;
    color: var(--text-secondary);
}

.status {
    font-weight: 500;
}

.status.success {
    color: var(--success-color);
}

.status.error {
    color: var(--error-color);
}

.status.warning {
    color: var(--warning-color);
}

.server-list {
    display: grid;
    gap: 16px;
    margin: 20px 0;
}

.server-item {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    position: relative;
}

.server-name {
    font-weight: 600;
    margin-bottom: 8px;
}

.server-status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-secondary);
}

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

.status-indicator.error {
    background-color: var(--error-color);
}

.status-indicator.testing {
    background-color: var(--warning-color);
    animation: pulse 1.5s infinite;
}

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

.progress-container {
    width: 100%;
    height: 20px;
    background-color: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.test-group {
    margin-bottom: 24px;
}

.test-description {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.log-viewer {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    margin-top: 40px;
    box-shadow: var(--shadow);
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.log-viewer h3 {
    margin: 0;
    color: var(--text-primary);
}

.debug-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.debug-toggle input[type="checkbox"] {
    cursor: pointer;
}

.log-content {
    background: #f3f4f6;
    border-radius: 4px;
    padding: 16px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.log-entry {
    margin-bottom: 8px;
    padding: 4px 0;
}

.log-entry.error {
    color: var(--error-color);
}

.log-entry.success {
    color: var(--success-color);
}

.log-entry.info {
    color: var(--text-secondary);
}

.log-entry.warning {
    color: var(--warning-color);
}

.log-entry.debug {
    color: #8b5cf6;
    font-size: 0.875rem;
    opacity: 0.8;
}

.log-details {
    font-family: monospace;
    font-size: 0.75rem;
    background: #f3f4f6;
    padding: 4px 8px;
    margin-top: 4px;
    border-radius: 4px;
    white-space: pre-wrap;
}

/* Stability Test Sequential UI */
.stability-progress {
    margin: 8px 0;
    font-weight: 500;
    color: var(--text-secondary);
}

.route-card.testing {
    border: 2px solid var(--primary-color);
    background-color: #f0f9ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.route-card.completed {
    border-color: var(--success-color);
    background-color: #f0fdf4;
}

.route-card.failed {
    border-color: var(--error-color);
    background-color: #fef2f2;
}

.route-card.waiting {
    border-color: #d1d5db;
    background-color: #f9fafb;
    opacity: 0.7;
}

.route-card.testing .status-indicator {
    animation: pulse 2s infinite;
}

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

/* Media Permission Dialog */
.media-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    max-width: 400px;
    border: 2px solid var(--primary-color);
}

.media-dialog-content h4 {
    margin: 0 0 16px 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.media-dialog-content p {
    margin: 12px 0;
    color: var(--text-secondary);
    line-height: 1.5;
}

.media-note {
    background: #f0f9ff;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    padding: 12px;
    margin-top: 16px;
}

.media-note small {
    color: var(--primary-color);
    font-weight: 500;
}

/* Media Preview */
.media-preview {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    z-index: 100;
    border: 2px solid var(--success-color);
}

.media-preview-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.media-preview video {
    width: 120px;
    height: 90px;
    border-radius: 6px;
    background: #000;
}

.media-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.media-info span {
    font-weight: 500;
    color: var(--success-color);
    font-size: 0.9rem;
}

.media-info small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.recommendations {
    margin-top: 20px;
    padding: 16px;
    background-color: #f3f4f6;
    border-radius: 6px;
}

.recommendations h4 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.recommendation {
    margin-bottom: 12px;
    padding: 12px;
    border-radius: 4px;
    font-size: 0.875rem;
}

.recommendation.critical {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--error-color);
}

.recommendation.high {
    background-color: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.recommendation.medium {
    background-color: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--primary-color);
}

.recommendation.info {
    background-color: #e0e7ff;
    color: #3730a3;
    border-left: 4px solid #6366f1;
}

/* Loading States */
.loading {
    display: inline-block;
    position: relative;
    color: var(--text-secondary);
}

.loading:after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-left: 8px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

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

/* NAT Visualization */
.nat-visualization {
    padding: 10px;
    background-color: #f5f5f5;
    border-radius: 8px;
    margin-top: 5px;
}

.nat-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.nat-description {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.nat-details {
    margin-top: 10px;
    padding: 10px;
    background-color: white;
    border-radius: 4px;
    border: 1px solid #e0e0e0;
}

.nat-details summary {
    cursor: pointer;
    font-weight: 600;
    color: #1976d2;
    outline: none;
}

.nat-details summary:hover {
    color: #0d47a1;
}

.nat-details p {
    margin: 10px 0;
    font-size: 14px;
    line-height: 1.5;
}

.nat-diagram {
    margin-top: 15px;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 4px;
    overflow-x: auto;
}

.nat-diagram pre {
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    line-height: 1.4;
    color: #333;
}

.nat-diagnostics {
    margin-top: 10px;
    padding: 10px;
    background-color: #fff3cd;
    border-radius: 4px;
    border: 1px solid #ffeaa7;
}

.nat-diagnostics summary {
    cursor: pointer;
    font-weight: 600;
    color: #856404;
    outline: none;
}

.nat-diagnostics summary:hover {
    color: #533f03;
}

.diagnostic-content {
    margin-top: 10px;
    font-size: 14px;
}

.diagnostic-content p {
    margin: 8px 0;
    color: #856404;
}

.diagnostic-hint {
    font-style: italic;
    margin-top: 10px !important;
}

.test-button.loading {
    position: relative;
    color: transparent;
}

.test-button.loading:after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Status Pills */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-pill.success {
    background-color: #dcfce7;
    color: #14532d;
}

.status-pill.error {
    background-color: #fee2e2;
    color: #7f1d1d;
}

.status-pill.warning {
    background-color: #fef3c7;
    color: #78350f;
}

.status-pill.info {
    background-color: #dbeafe;
    color: #1e3a8a;
}

/* Improved Server Cards */
.server-item {
    transition: all 0.3s ease;
    cursor: pointer;
}

.server-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.server-item.testing {
    border-color: var(--warning-color);
    background-color: #fef3c7;
}

.server-item.success {
    border-color: var(--success-color);
    background-color: #dcfce7;
}

.server-item.error {
    border-color: var(--error-color);
    background-color: #fee2e2;
}

.server-details {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.server-details span {
    margin-right: 12px;
    font-family: 'Courier New', Courier, monospace;
}

.server-details .success {
    color: var(--success-color);
}

.server-details .error {
    color: var(--error-color);
    font-weight: 500;
}

.failed-summary {
    margin-top: 12px;
    padding: 12px;
    background-color: #fef2f2;
    border-left: 4px solid var(--error-color);
    border-radius: 4px;
    font-size: 0.875rem;
    color: #991b1b;
}

.failed-summary strong {
    display: block;
    margin-bottom: 4px;
}

/* Protocol Status Grid */
.protocol-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 12px;
}

.protocol-status {
    padding: 8px;
    border-radius: 4px;
    text-align: center;
    font-size: 0.875rem;
    background-color: #f3f4f6;
}

.protocol-status.success {
    background-color: #dcfce7;
    color: #14532d;
}

.protocol-status.error {
    background-color: #fee2e2;
    color: #7f1d1d;
}

/* Improved Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    h1 {
        font-size: 1.75rem;
        text-align: center;
    }

    .subtitle {
        font-size: 1rem;
        text-align: center;
    }

    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .tabs::-webkit-scrollbar {
        display: none;
    }

    .tab-button {
        padding: 10px 20px;
        font-size: 0.875rem;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .test-section {
        padding: 16px;
    }

    .port-table {
        font-size: 0.875rem;
    }

    .port-table th,
    .port-table td {
        padding: 8px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-item {
        font-size: 0.875rem;
    }

    .server-list {
        gap: 12px;
    }

    .server-item {
        padding: 12px;
    }

    .protocol-grid {
        grid-template-columns: 1fr;
    }

    .test-button {
        width: 100%;
        padding: 12px;
    }

    .log-viewer {
        margin-top: 20px;
    }

    .log-content {
        max-height: 200px;
        font-size: 0.75rem;
    }
}

/* Improved Animations */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

/* Better Focus States */
.test-button:focus,
.tab-button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Improved Progress Bar */
.progress-container {
    position: relative;
    background-color: #e5e7eb;
}

.progress-bar {
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Tooltip Support */
.tooltip {
    position: relative;
}

.tooltip:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #1f2937;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
    margin-bottom: 4px;
    z-index: 100;
}

/* Print Styles */
@media print {
    .tabs,
    .test-button,
    .log-viewer {
        display: none;
    }
    
    .test-section {
        break-inside: avoid;
        page-break-inside: avoid;
    }
    
    body {
        font-size: 12pt;
    }
}

/* Stability Test UI */
#stability-container {
    margin-top: 20px;
}

.stability-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 16px;
    background-color: #f3f4f6;
    border-radius: 8px;
}

.stability-header h4 {
    margin: 0;
    color: #1f2937;
}

.stability-timer {
    font-size: 1.125rem;
    font-weight: 600;
    color: #2563eb;
}

.routes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.route-card {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 16px;
    transition: all 0.3s ease;
}

.route-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.route-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.route-header h5 {
    margin: 0;
    font-size: 1rem;
    color: #1f2937;
}

.protocol-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.protocol-badge.udp {
    background-color: #dbeafe;
    color: #1e40af;
}

.protocol-badge.tcp {
    background-color: #e0e7ff;
    color: #4338ca;
}

.protocol-badge.tls,
.protocol-badge.tls443 {
    background-color: #dcfce7;
    color: #16a34a;
}

.route-status {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #6b7280;
    position: relative;
}

.status-indicator.connecting {
    background-color: #f59e0b;
    animation: pulse 1.5s infinite;
}

.status-indicator.connected {
    background-color: #10b981;
}

.status-indicator.disconnected,
.status-indicator.failed {
    background-color: #ef4444;
}

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

.status-text {
    font-size: 0.875rem;
    color: #6b7280;
}

.route-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.metric {
    text-align: center;
}

.metric-label {
    display: block;
    font-size: 0.75rem;
    color: #6b7280;
    margin-bottom: 4px;
}

.metric-value {
    display: block;
    font-size: 1.125rem;
    font-weight: 600;
    color: #1f2937;
}

.stability-graph {
    height: 50px;
    background-color: #f9fafb;
    border-radius: 4px;
    display: flex;
    align-items: flex-end;
    gap: 1px;
    padding: 4px;
    overflow: hidden;
}

.rtt-bar {
    flex: 1;
    min-width: 2px;
    background-color: #3b82f6;
    transition: height 0.3s ease;
}

/* Responsive adjustments for stability test */
@media (max-width: 768px) {
    .routes-grid {
        grid-template-columns: 1fr;
    }
    
    .route-metrics {
        grid-template-columns: repeat(3, 1fr);
        font-size: 0.875rem;
    }
    
    .metric-value {
        font-size: 1rem;
    }
}