/* CSS Variables */
:root {
    --primary-color: #165DFF;
    --primary-hover: #0E42D2;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --error-color: #ff4757;
    --success-color: #2ed573;
    --warning-color: #ffa502;
    --background-color: #fff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --spacing: 1rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing);
}

/* Main content */
main {
    display: grid;
    gap: 1.5rem;
    margin-top: 1rem;
}

/* Section styles */
.upload-section,
.settings-section,
.action-section,
.progress-section,
.results-section {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.upload-section h2,
.settings-section h2,
.progress-section h2,
.results-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* File upload */
.file-upload {
    margin-bottom: 1rem;
}

.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    background-color: #f8f9ff;
    border-color: var(--primary-hover);
}

.upload-area.dragover {
    background-color: #e8f3ff;
    border-color: var(--primary-color);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    margin-top: 0.5rem;
}

/* Settings */
.settings-group {
    margin-bottom: 1rem;
}

.settings-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .settings-row {
        grid-template-columns: 1fr;
    }
}

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

.settings-group input,
.settings-group select,
.settings-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.settings-group input:focus,
.settings-group select:focus,
.settings-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(22, 93, 255, 0.1);
}

.settings-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Engine settings */
.engine-settings {
    margin: 1rem 0;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.engine-settings h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Environment variable status */
.env-status {
    margin-top: 0.5rem;
}

.env-item {
    padding: 0.5rem;
    margin: 0.25rem 0;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.9rem;
}

.env-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.env-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.env-var {
    font-weight: 600;
}

.env-value {
    font-weight: normal;
}

/* Read-only inputs */
.readonly-input {
    background-color: #f8f9fa;
    color: #6c757d;
    cursor: not-allowed;
}

/* Engine settings - always hidden */
#engineSettings, .engine-settings {
    display: none !important;
}

/* Advanced settings */
.advanced-settings {
    margin-top: 1.5rem;
}

.advanced-settings summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    padding: 0.5rem 0;
    user-select: none;
}

.advanced-settings summary:hover {
    color: var(--primary-hover);
}

.advanced-settings h3 {
    margin: 1.5rem 0 1rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Checkbox groups */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
}

.checkbox-group label:hover {
    background-color: #f8f9fa;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

/* Range input styling */
input[type="range"] {
    width: calc(100% - 40px);
    margin-right: 10px;
}

#shortLineSplitFactorValue {
    font-weight: 600;
    color: var(--primary-color);
}

/* Buttons */
.primary-button,
.secondary-button,
.download-button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.primary-button:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}

.primary-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

.secondary-button:hover {
    background-color: #ff3742;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 71, 87, 0.3);
}

.download-button {
    background-color: var(--success-color);
    color: white;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.download-button:hover {
    background-color: #26de81;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46, 213, 115, 0.3);
}

/* Action section */
.action-section {
    text-align: center;
}

/* Progress section */
.progress-bar {
    width: 100%;
    height: 20px;
    background-color: var(--secondary-color);
    border-radius: 10px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-text {
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.progress-details {
    font-size: 0.95rem;
    color: #555;
    text-align: center;
    font-weight: 500;
}

/* Results section */
.download-buttons {
    margin-bottom: 1.5rem;
}

.translation-stats {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--success-color);
}

.translation-stats h4 {
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

/* Storage info styling */
.storage-info {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.95rem;
    display: inline-block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.storage-info.warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}


/* Error states */
.error {
    color: var(--error-color);
    background-color: #fff5f5;
    border: 1px solid #fed7d7;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    margin: 0.5rem 0;
}

.success {
    color: var(--success-color);
    background-color: #f0fff4;
    border: 1px solid #9ae6b4;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    margin: 0.5rem 0;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .settings-row {
        grid-template-columns: 1fr;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .upload-area {
        padding: 1.5rem;
    }
    
    .upload-icon {
        font-size: 2rem;
    }
}

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

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Hide/show elements */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}