/* CSS Variables for theming */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px 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);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.2s ease;
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
}

/* Header */
.header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 2rem 1.5rem;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    margin-top: 0.5rem;
}

/* Main content */
.main-content {
    flex: 1;
    padding: 2rem 1.5rem;
}

/* Input section */
.input-section {
    margin-bottom: 2rem;
}

.audit-form {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.input-wrapper {
    display: flex;
    gap: 0.75rem;
}

#url-input {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
}

#url-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

#url-input::placeholder {
    color: var(--text-muted);
}

#audit-btn {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

#audit-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

#audit-btn:active {
    transform: translateY(0);
}

#audit-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.input-hint {
    margin-top: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Loading section */
.loading-section {
    padding: 4rem 2rem;
}

.loader-container {
    text-align: center;
}

.loader {
    width: 64px;
    height: 64px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.loading-subtext {
    color: var(--text-secondary);
}

/* Error section */
.error-section {
    padding: 3rem 2rem;
}

.error-container {
    text-align: center;
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.error-container h2 {
    color: var(--danger-color);
    margin-bottom: 0.5rem;
}

.error-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.retry-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Results section */
.results-section {
    animation: fadeIn 0.3s ease;
}

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

.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.audited-url {
    color: var(--text-secondary);
    font-size: 0.875rem;
    word-break: break-all;
}

/* Score cards */
.scores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.score-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.score-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.score-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    background: var(--bg-tertiary);
    border: 4px solid var(--border-color);
    transition: var(--transition);
}

.score-circle.score-good {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.score-circle.score-average {
    border-color: var(--warning-color);
    background: rgba(245, 158, 11, 0.1);
}

.score-circle.score-poor {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.score-card h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.score-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Tabs */
.details-tabs {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.tab-buttons {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-btn {
    flex: 1;
    min-width: max-content;
    padding: 1rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.tab-content {
    padding: 1.5rem;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

.tab-panel h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.tab-panel h3:not(:first-child) {
    margin-top: 2rem;
}

/* Metrics list */
.metrics-list {
    display: grid;
    gap: 0.75rem;
}

.metric-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

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

.metric-value {
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.metric-value.good {
    color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.metric-value.average {
    color: var(--warning-color);
    background: rgba(245, 158, 11, 0.1);
}

.metric-value.poor {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Issues and suggestions list */
.issues-list, .suggestions-list {
    display: grid;
    gap: 0.75rem;
}

.issue-item, .suggestion-item {
    padding: 1rem;
    border-radius: var(--radius-md);
    border-left: 4px solid;
}

.issue-item {
    background: rgba(239, 68, 68, 0.05);
    border-left-color: var(--danger-color);
}

.issue-item.warning {
    background: rgba(245, 158, 11, 0.05);
    border-left-color: var(--warning-color);
}

.issue-item.passed {
    background: rgba(16, 185, 129, 0.05);
    border-left-color: var(--success-color);
}

.suggestion-item {
    background: rgba(79, 70, 229, 0.05);
    border-left-color: var(--primary-color);
}

.issue-title, .suggestion-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.issue-description, .suggestion-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.empty-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

/* Actions bar */
.actions-bar {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.primary-btn, .secondary-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.primary-btn {
    color: white;
    background: var(--primary-color);
    border: none;
}

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

.secondary-btn {
    color: var(--primary-color);
    background: transparent;
    border: 2px solid var(--primary-color);
}

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

/* Info section */
.info-section {
    margin-top: 3rem;
}

.info-section h2 {
    text-align: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.info-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.info-card h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.info-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--text-muted);
    padding: 1.5rem;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
}

.footer a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

/* Mobile responsive */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 1.5rem 1rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    #audit-btn {
        width: 100%;
        justify-content: center;
    }

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

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }

    .tab-content {
        padding: 1rem;
    }

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

    .primary-btn, .secondary-btn {
        width: 100%;
    }

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

@media (max-width: 480px) {
    .logo-container {
        flex-direction: column;
        gap: 0.5rem;
    }

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

    .score-card {
        display: flex;
        align-items: center;
        text-align: left;
        gap: 1rem;
    }

    .score-circle {
        margin: 0;
        width: 60px;
        height: 60px;
        flex-shrink: 0;
    }

    .score-value {
        font-size: 1.25rem;
    }

    .metric-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

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

/* Print styles */
@media print {
    .header {
        background: none;
        color: var(--text-primary);
    }

    .input-section,
    .info-section,
    .actions-bar,
    .footer {
        display: none;
    }

    .score-card,
    .details-tabs {
        break-inside: avoid;
    }
}