/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 8px;
    --transition: all 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-color) 100%);
    padding: 2rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    border-radius: var(--radius);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Content */
main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

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

.tab-content {
    display: none;
}

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

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.card h3 {
    font-size: 1.1rem;
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-note {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-loader {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Results */
.result-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--radius);
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.meta-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-badge.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.status-badge.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.preview-container {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 1rem;
    overflow: auto;
    max-height: 600px;
}

#screenshot-preview {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: var(--radius);
}

.result-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Error Display */
.error-box {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 1rem;
}

.error-box h3 {
    color: var(--error-color);
    margin: 0 0 0.5rem;
}

#error-message {
    color: var(--error-color);
    white-space: pre-wrap;
    word-break: break-word;
}

.error-details {
    margin-top: 1rem;
}

.error-details h4 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

#error-response {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
    overflow: auto;
    max-height: 300px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Request Details */
.request-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.detail-section h4 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.detail-section pre {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
    overflow: auto;
    font-size: 0.875rem;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Comparison */
.comparison-controls {
    margin-bottom: 1.5rem;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.comparison-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.comparison-item {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1rem;
    position: relative;
}

.comparison-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.comparison-item-title {
    font-weight: 500;
    font-size: 0.875rem;
}

.comparison-item-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.25rem;
    line-height: 1;
}

.comparison-item-remove:hover {
    color: var(--error-color);
}

.comparison-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
}

.comparison-item-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.comparison-analysis {
    margin-top: 1.5rem;
}

.analysis-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.analysis-table th,
.analysis-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.analysis-table th {
    color: var(--text-secondary);
    font-weight: 500;
}

.analysis-table td:first-child {
    color: var(--text-secondary);
}

.fastest {
    color: var(--success-color);
    font-weight: 500;
}

.smallest {
    color: var(--success-color);
    font-weight: 500;
}

/* Performance */
.perf-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.perf-stat {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
    text-align: center;
}

.perf-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.perf-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.perf-chart-container {
    margin-bottom: 2rem;
}

.perf-chart-container h3 {
    margin-bottom: 1rem;
}

.perf-chart {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1rem;
    height: 200px;
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
}

.chart-bar {
    flex: 1;
    background: var(--primary-color);
    border-radius: var(--radius) var(--radius) 0 0;
    min-height: 10px;
    position: relative;
    transition: var(--transition);
}

.chart-bar:hover {
    background: var(--primary-hover);
}

.chart-bar.error {
    background: var(--error-color);
}

.chart-bar-label {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.chart-bar-value {
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-primary);
    white-space: nowrap;
}

.perf-log h3 {
    margin-bottom: 1rem;
}

.log-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-color);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.log-entry-number {
    color: var(--text-secondary);
    min-width: 30px;
}

.log-entry-status {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.log-entry-status.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.log-entry-status.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.log-entry-time {
    color: var(--text-primary);
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 1rem;
    text-align: center;
}

.footer-content {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer-content a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .tabs {
        justify-content: center;
    }

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

    .card {
        padding: 1rem;
    }

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

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .result-actions {
        flex-direction: column;
    }

    .result-actions .btn {
        width: 100%;
    }

    .perf-summary {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 480px) {
    .params-grid {
        grid-template-columns: 1fr;
    }

    .perf-summary {
        grid-template-columns: 1fr;
    }

    .result-meta {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
[hidden] {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}