/* CSS Variables for Themes */
:root {
    --bg-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    --container-bg: rgba(255, 255, 255, 0.98);
    --container-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    --container-border: rgba(0, 0, 0, 0.05);
    --text-color: #1a202c;
    --subtitle-color: #718096;
    --h1-gradient: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    --status-bg: linear-gradient(135deg, rgba(72, 187, 120, 0.1), rgba(56, 178, 172, 0.1));
    --status-color: #2f855a;
    --status-border: rgba(72, 187, 120, 0.2);
    --chip-bg: linear-gradient(135deg, rgba(113, 128, 150, 0.1), rgba(160, 174, 192, 0.1));
    --chip-border: rgba(113, 128, 150, 0.2);
    --chip-color: #4a5568;
    --chip-hover-bg: linear-gradient(135deg, rgba(113, 128, 150, 0.15), rgba(160, 174, 192, 0.15));
    --chip-hover-shadow: 0 5px 15px rgba(113, 128, 150, 0.2);
    --label-color: #4a5568;
    --textarea-bg: rgba(255, 255, 255, 0.95);
    --textarea-border: #e2e8f0;
    --textarea-color: #1a202c;
    --textarea-focus-border: #4a5568;
    --textarea-focus-shadow: rgba(74, 85, 104, 0.1);
    --output-bg: linear-gradient(135deg, rgba(74, 85, 104, 0.05), rgba(113, 128, 150, 0.05));
    --output-border: rgba(74, 85, 104, 0.2);
    --output-color: #2d3748;
    --translate-bg: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    --translate-hover-shadow: 0 10px 25px rgba(74, 85, 104, 0.3);
    --clear-bg: #f7fafc;
    --clear-color: #718096;
    --clear-border: #e2e8f0;
    --clear-hover-bg: #edf2f7;
    --loading-bg: rgba(74, 85, 104, 0.05);
    --loading-border: rgba(74, 85, 104, 0.1);
    --loading-color: #4a5568;
    --spinner-border: rgba(74, 85, 104, 0.2);
    --spinner-top: #4a5568;
    --progress-color: #4a5568;
    --details-bg: rgba(247, 250, 252, 0.8);
    --details-border: #e2e8f0;
    --details-h3: #2d3748;
    --detail-item-bg: #ffffff;
    --detail-item-border: #e2e8f0;
    --detail-label: #718096;
    --detail-value: #2d3748;
    --breakdown-h4: #4a5568;
    --word-card-bg: #ffffff;
    --word-card-border: #4a5568;
    --word-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    --word-english: #718096;
    --word-khmer: #2d3748;
    --confidence-bg: #e2e8f0;
    --confidence-fill: linear-gradient(90deg, #48bb78, #38b2ac);
}

[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --container-bg: rgba(26, 26, 46, 0.95);
    --container-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    --container-border: rgba(255, 255, 255, 0.1);
    --text-color: #e2e8f0;
    --subtitle-color: #a8b2d1;
    --h1-gradient: linear-gradient(135deg, #e2e8f0 0%, #a8b2d1 100%);
    --status-bg: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(22, 163, 74, 0.1));
    --status-color: #bbf7d0;
    --status-border: rgba(34, 197, 94, 0.3);
    --chip-bg: linear-gradient(135deg, rgba(147, 197, 253, 0.1), rgba(96, 165, 250, 0.1));
    --chip-border: rgba(147, 197, 253, 0.3);
    --chip-color: #dbeafe;
    --chip-hover-bg: linear-gradient(135deg, rgba(147, 197, 253, 0.2), rgba(96, 165, 250, 0.2));
    --chip-hover-shadow: 0 5px 15px rgba(147, 197, 253, 0.3);
    --label-color: #cbd5e1;
    --textarea-bg: rgba(30, 41, 59, 0.9);
    --textarea-border: #475569;
    --textarea-color: #e2e8f0;
    --textarea-focus-border: #3b82f6;
    --textarea-focus-shadow: rgba(59, 130, 246, 0.1);
    --output-bg: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(37, 99, 235, 0.05));
    --output-border: rgba(59, 130, 246, 0.3);
    --output-color: #dbeafe;
    --translate-bg: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --translate-hover-shadow: 0 10px 25px rgba(59, 130, 246, 0.4);
    --clear-bg: #374151;
    --clear-color: #d1d5db;
    --clear-border: #4b5563;
    --clear-hover-bg: #4b5563;
    --loading-bg: rgba(59, 130, 246, 0.05);
    --loading-border: rgba(59, 130, 246, 0.2);
    --loading-color: #3b82f6;
    --spinner-border: rgba(59, 130, 246, 0.3);
    --spinner-top: #3b82f6;
    --progress-color: #3b82f6;
    --details-bg: rgba(51, 65, 85, 0.5);
    --details-border: #475569;
    --details-h3: #e2e8f0;
    --detail-item-bg: rgba(30, 41, 59, 0.8);
    --detail-item-border: #475569;
    --detail-label: #94a3b8;
    --detail-value: #dbeafe;
    --breakdown-h4: #cbd5e1;
    --word-card-bg: rgba(30, 41, 59, 0.8);
    --word-card-border: #3b82f6;
    --word-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    --word-english: #94a3b8;
    --word-khmer: #dbeafe;
    --confidence-bg: #475569;
    --confidence-fill: linear-gradient(90deg, #22c55e, #16a34a);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-color);
}

.container {
    background: var(--container-bg);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    max-width: 1000px;
    width: 100%;
    box-shadow: var(--container-shadow);
    border: 1px solid var(--container-border);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

h1 {
    background: var(--h1-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.8em;
    margin: 0;
    font-weight: 800;
}

.theme-toggle {
    background: var(--chip-bg);
    border: 2px solid var(--chip-border);
    color: var(--chip-color);
    padding: 10px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--chip-hover-bg);
    transform: translateY(-2px);
    box-shadow: var(--chip-hover-shadow);
}

.subtitle {
    text-align: center;
    color: var(--subtitle-color);
    margin-bottom: 30px;
    font-size: 1.1em;
}

.status {
    text-align: center;
    padding: 15px;
    background: var(--status-bg);
    border-radius: 12px;
    margin-bottom: 30px;
    color: var(--status-color);
    font-weight: 600;
    border: 2px solid var(--status-border);
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    justify-content: center;
}

.suggestion-chip {
    padding: 12px 20px;
    background: var(--chip-bg);
    border: 2px solid var(--chip-border);
    border-radius: 20px;
    color: var(--chip-color);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.suggestion-chip:hover {
    background: var(--chip-hover-bg);
    transform: translateY(-2px);
    box-shadow: var(--chip-hover-shadow);
}

.input-section {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 10px;
    color: var(--label-color);
    font-weight: 600;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

textarea {
    width: 100%;
    padding: 20px;
    border: 2px solid var(--textarea-border);
    border-radius: 16px;
    font-size: 1.1em;
    font-family: inherit;
    resize: vertical;
    min-height: 120px;
    transition: all 0.3s ease;
    background: var(--textarea-bg);
    color: var(--textarea-color);
}

textarea:focus {
    outline: none;
    border-color: var(--textarea-focus-border);
    box-shadow: 0 0 0 3px var(--textarea-focus-shadow);
}

textarea#output {
    background: var(--output-bg);
    border-color: var(--output-border);
    font-size: 1.4em;
    font-weight: 700;
    color: var(--output-color);
    min-height: 100px;
    font-family: 'Noto Serif Khmer', serif;
}

.button-group {
    display: flex;
    gap: 15px;
    margin: 25px 0;
}

button {
    flex: 1;
    padding: 16px 30px;
    border: none;
    border-radius: 12px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

#translateBtn {
    background: var(--translate-bg);
    color: white;
}

#translateBtn:hover {
    transform: translateY(-2px);
    box-shadow: var(--translate-hover-shadow);
}

#clearBtn {
    background: var(--clear-bg);
    color: var(--clear-color);
    border: 2px solid var(--clear-border);
}

#clearBtn:hover {
    background: var(--clear-hover-bg);
}

.loading {
    text-align: center;
    padding: 20px;
    color: var(--loading-color);
    display: none;
    background: var(--loading-bg);
    border-radius: 12px;
    border: 2px solid var(--loading-border);
    margin: 20px 0;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--spinner-border);
    border-top: 3px solid var(--spinner-top);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.progress-text {
    text-align: center;
    color: var(--progress-color);
    font-weight: 600;
    margin: 15px 0;
    min-height: 24px;
}

/* Details Section */
.details-section {
    margin-top: 30px;
    padding: 25px;
    background: var(--details-bg);
    border-radius: 16px;
    border: 2px solid var(--details-border);
}

.details-section h3 {
    color: var(--details-h3);
    margin-bottom: 20px;
    font-size: 1.3em;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: 15px;
    background: var(--detail-item-bg);
    border-radius: 12px;
    border: 2px solid var(--detail-item-border);
}

.detail-label {
    color: var(--detail-label);
    font-weight: 600;
}

.detail-value {
    color: var(--detail-value);
    font-weight: 700;
}

/* Breakdown Section */
.breakdown-section {
    margin-top: 20px;
}

.breakdown-section h4 {
    color: var(--breakdown-h4);
    margin-bottom: 15px;
    font-size: 1.1em;
}

.breakdown-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
}

.word-card {
    background: var(--word-card-bg);
    padding: 15px;
    border-radius: 12px;
    border-left: 4px solid var(--word-card-border);
    box-shadow: var(--word-card-shadow);
}

.word-english {
    font-size: 0.9em;
    color: var(--word-english);
    margin-bottom: 5px;
}

.word-khmer {
    font-size: 1.2em;
    color: var(--word-khmer);
    font-weight: 700;
    margin-bottom: 10px;
    font-family: 'Noto Serif Khmer', serif;
}

.confidence-bar {
    height: 6px;
    background: var(--confidence-bg);
    border-radius: 3px;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: var(--confidence-fill);
    border-radius: 3px;
    transition: width 0.5s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 25px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
    }
    
    .breakdown-container {
        grid-template-columns: 1fr;
    }
}