:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 2rem 1rem;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.input-section {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
    justify-content: center;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

.btn-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loader {
    display: block;
}

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

.results-section {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    animation: fadeIn 0.3s ease-in;
}

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

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.export-buttons {
    display: flex;
    gap: 0.75rem;
}

.url-display {
    background: var(--background);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    word-break: break-all;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

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

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

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

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

.confidence-high {
    color: var(--success);
    font-weight: 600;
}

.confidence-medium {
    color: var(--warning);
    font-weight: 600;
}

.confidence-low {
    color: var(--error);
    font-weight: 600;
}

.metrics-details {
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
}

.metrics-details h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.metric-item {
    background: var(--background);
    padding: 1rem;
    border-radius: 8px;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.metric-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-section {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.info-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-section p {
    color: var(--text-secondary);
}

@media (max-width: 640px) {
    header h1 {
        font-size: 2rem;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .export-buttons {
        width: 100%;
    }

    .export-buttons .btn {
        flex: 1;
    }

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

    .results-table th,
    .results-table td {
        padding: 0.75rem 0.5rem;
    }
}