/**
 * AI Content Detector - QuillBot-style UI
 */

/* =============================================================================
   CSS Variables
   ============================================================================= */

:root {
    /* Brand Colors */
    --color-primary: #1a8754;
    --color-primary-light: #22a366;
    --color-primary-dark: #146b43;

    /* AI Detection Colors */
    --color-ai: #e89d3c;
    --color-ai-bg: rgba(232, 157, 60, 0.25);
    --color-ai-light: #f5c882;

    --color-mixed: #5b9bd5;
    --color-mixed-bg: rgba(91, 155, 213, 0.2);

    --color-human: #d9d9d9;
    --color-human-dark: #999;

    /* UI Colors */
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-border: #e0e0e0;
    --color-border-light: #f0f0f0;

    /* Text Colors */
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* =============================================================================
   Base Styles
   ============================================================================= */

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

html, body {
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.5;
}

/* =============================================================================
   App Container
   ============================================================================= */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* =============================================================================
   Header
   ============================================================================= */

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    padding: 0 var(--spacing-lg);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.header-left {
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text {
    font-weight: 600;
    font-size: 16px;
    color: var(--color-text);
}

.header-center h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
}

.header-right {
    display: flex;
    align-items: center;
}

.language-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.language-selector:hover {
    background: var(--color-bg);
}

.lang-icon {
    font-weight: 600;
    color: var(--color-text);
}

/* =============================================================================
   Main Content - Two Panel Layout
   ============================================================================= */

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* =============================================================================
   Editor Panel (Left)
   ============================================================================= */

.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
}

.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-bg);
}

.format-buttons {
    display: flex;
    align-items: center;
    gap: 2px;
}

.format-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.15s;
}

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

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

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--color-border);
    margin: 0 var(--spacing-sm);
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all 0.15s;
}

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

/* Text Input (contenteditable) */
.text-input {
    flex: 1;
    width: 100%;
    padding: var(--spacing-lg);
    border: none;
    outline: none;
    font-family: var(--font-family);
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text);
    background: transparent;
    overflow-y: auto;
    min-height: 200px;
}

.text-input:empty::before {
    content: attr(data-placeholder);
    color: var(--color-text-muted);
    pointer-events: none;
}

.text-input:focus {
    outline: none;
}

/* Formatting styles inside editor */
.text-input h1 {
    font-size: 1.8em;
    font-weight: 700;
    margin: 0.5em 0;
}

.text-input h2 {
    font-size: 1.4em;
    font-weight: 600;
    margin: 0.5em 0;
}

.text-input ul, .text-input ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.text-input li {
    margin: 0.25em 0;
}

/* Highlighted Content Display */
.highlighted-content {
    flex: 1;
    width: 100%;
    padding: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    font-family: var(--font-family);
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text);
    overflow-y: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.highlighted-content .ai-sentence {
    background-color: var(--color-ai-bg);
    padding: 2px 0;
    border-radius: 2px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.highlighted-content .ai-sentence:hover {
    background-color: rgba(232, 157, 60, 0.4);
}

.highlighted-content .human-sentence {
    /* No special styling for human sentences */
}

/* Status Bar */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
    background: var(--color-surface);
}

.word-count {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

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

.feedback-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all 0.2s;
}

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

.analysis-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 13px;
    color: var(--color-text-secondary);
}

.analysis-status.complete {
    color: var(--color-primary);
}

.analysis-status.complete::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M5 13l4 4L19 7'/%3E%3C/svg%3E");
    background-size: 12px;
    background-position: center;
    background-repeat: no-repeat;
}

/* =============================================================================
   Results Panel (Right)
   ============================================================================= */

.results-panel {
    width: 340px;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border-light);
    overflow-y: auto;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.model-info {
    font-size: 12px;
    color: var(--color-text-muted);
}

.results-actions {
    display: flex;
    gap: var(--spacing-md);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: none;
    border: none;
    font-size: 12px;
    color: var(--color-primary);
    cursor: pointer;
    transition: opacity 0.2s;
}

.action-btn:hover {
    opacity: 0.8;
}

.action-btn svg {
    stroke: var(--color-primary);
}

/* Score Display */
.score-display {
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.score-number {
    font-size: 72px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.percent-symbol {
    font-size: 28px;
    font-weight: 500;
    vertical-align: top;
    margin-left: -4px;
}

.score-label {
    margin-top: var(--spacing-sm);
    font-size: 14px;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    cursor: help;
}

.info-icon:hover {
    color: var(--color-text-secondary);
}

/* Comparison Chart */
.comparison-chart {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.chart-bars {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    height: 100px;
    align-items: flex-end;
}

.bar-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.bar {
    width: 60px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height 0.5s ease;
    min-height: 4px;
}

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

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

.bar-label {
    font-size: 12px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Score Breakdown */
.score-breakdown {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.breakdown-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.breakdown-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: var(--spacing-sm);
}

.breakdown-dot.ai {
    background: var(--color-ai);
}

.breakdown-dot.mixed {
    background: var(--color-mixed);
}

.breakdown-dot.human {
    background: var(--color-human);
    border: 1px solid var(--color-human-dark);
}

.breakdown-label {
    flex: 1;
    font-size: 13px;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.breakdown-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
}

/* Contributors Section */
.contributors-section {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
    overflow-y: auto;
}

.contributors-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.contributors-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contributor-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.2s;
}

.contributor-item:hover {
    background: var(--color-border-light);
}

.contributor-score {
    flex-shrink: 0;
    padding: 2px 8px;
    background: var(--color-ai-bg);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    color: #8b6914;
}

.contributor-score.low {
    background: var(--color-ai-bg);
    color: #8b6914;
}

.contributor-score.medium {
    background: rgba(232, 157, 60, 0.4);
    color: #7a5c10;
}

.contributor-score.high {
    background: rgba(232, 157, 60, 0.6);
    color: #5c4408;
}

.contributor-text {
    flex: 1;
    font-size: 12px;
    color: var(--color-text-secondary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.contributor-expand {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

.empty-state {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 13px;
}

/* Analyze Button */
.analyze-section {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.analyze-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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

.analyze-btn:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
}

.btn-loader {
    display: flex;
    align-items: center;
}

.spinner {
    animation: spin 1s linear infinite;
}

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

/* =============================================================================
   Loading Overlay
   ============================================================================= */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

/* =============================================================================
   Responsive Design
   ============================================================================= */

@media (max-width: 900px) {
    .main-content {
        flex-direction: column;
    }

    .editor-panel {
        flex: none;
        height: 50%;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .results-panel {
        width: 100%;
        flex: 1;
    }

    .header-center {
        display: none;
    }
}

@media (max-width: 600px) {
    .app-header {
        padding: 0 var(--spacing-md);
    }

    .results-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .score-number {
        font-size: 56px;
    }

    .chart-bars {
        gap: var(--spacing-lg);
    }

    .bar {
        width: 48px;
    }
}

/* =============================================================================
   Utility Classes
   ============================================================================= */

.hidden {
    display: none !important;
}