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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
main {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
}

section {
    padding: 2rem;
    border-bottom: 1px solid #e0e0e0;
}

section:last-child {
    border-bottom: none;
}

/* Drag and Drop Zone */
.drag-drop-zone {
    position: relative;
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drag-drop-zone:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.drag-drop-zone.drag-over {
    border-color: #667eea;
    background-color: #f0f4ff;
    transform: scale(1.02);
}

.drag-drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    fill: #667eea;
    opacity: 0.7;
}

.drag-drop-content h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.browse-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s ease;
}

.browse-btn:hover {
    background: #5a6fd8;
}

.file-types {
    color: #666;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.drag-active {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(102, 126, 234, 0.1);
    border: 3px dashed #667eea;
    border-radius: 12px;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.drag-active.active {
    display: flex;
}

.drag-active-content {
    text-align: center;
    color: #667eea;
}

/* Progress Section */
.progress-container {
    margin-bottom: 2rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    color: #666;
    font-weight: 500;
}

/* Settings Section */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-weight: 600;
    color: #333;
}

.setting-item input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    outline: none;
}

.setting-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
}

.setting-item input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #667eea;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.setting-item select {
    padding: 0.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    background: white;
}

.compress-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
    display: block;
    margin: 0 auto;
}

.compress-btn:hover {
    transform: translateY(-2px);
}

.compress-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Results Section */
.results-grid {
    display: grid;
    gap: 2rem;
}

.result-item {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #e0e0e0;
}

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

.result-filename {
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
}

.result-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.result-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.result-image {
    text-align: center;
}

.result-image img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.result-image-label {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #666;
}

.result-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.download-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s ease;
}

.download-btn:hover {
    background: #218838;
}

/* Error Messages */
.error-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #dc3545;
    color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    z-index: 1000;
    max-width: 400px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.error-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-icon {
    fill: white;
    flex-shrink: 0;
}

.error-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
}

/* Loading Spinner */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e0e0e0;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Processing Files */
.processing-files {
    display: grid;
    gap: 1rem;
}

.processing-file {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.processing-file-icon {
    width: 40px;
    height: 40px;
    background: #667eea;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    flex-shrink: 0;
}

.processing-file-info {
    flex: 1;
}

.processing-file-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.processing-file-status {
    color: #666;
    font-size: 0.9rem;
}

.processing-file-progress {
    width: 100%;
    height: 4px;
    background: #e0e0e0;
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.processing-file-progress-fill {
    height: 100%;
    background: #667eea;
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    section {
        padding: 1.5rem;
    }
    
    .drag-drop-zone {
        padding: 2rem 1rem;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .result-images {
        grid-template-columns: 1fr;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .error-message {
        position: relative;
        top: auto;
        right: auto;
        margin: 1rem 0;
    }
}

@media (max-width: 480px) {
    .drag-drop-content h3 {
        font-size: 1.2rem;
    }
    
    .compress-btn {
        width: 100%;
        padding: 0.8rem;
    }
    
    .result-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}