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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent-primary: #0066cc;
    --accent-hover: #0052a3;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --border: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --border: #495057;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-primary);
}

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

.theme-toggle {
    background: var(--bg-tertiary);
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: white;
}

.main-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.upload-zone {
    background: var(--bg-primary);
    border: 3px dashed var(--border);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 8px var(--shadow);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-zone.dragover {
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    transform: scale(1.02);
}

.upload-zone svg {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
    opacity: 0.6;
}

.upload-zone h3 {
    margin-bottom: 10px;
    font-size: 20px;
}

.upload-zone p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.btn {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn:disabled {
    background: var(--border);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn-success {
    background: var(--success);
}

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

.preview-section {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px var(--shadow);
    min-height: 300px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    max-height: 600px;
    overflow-y: auto;
    padding-right: 5px;
}

.preview-grid::-webkit-scrollbar {
    width: 8px;
}

.preview-grid::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.image-card {
    background: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.image-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow);
    border-color: var(--accent-primary);
}

.image-preview {
    position: relative;
    width: 100%;
    height: 150px;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-status {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.7);
    color: white;
}

.image-status.processing {
    background: var(--warning);
}

.image-status.completed {
    background: var(--success);
}

.image-info {
    padding: 12px;
}

.image-name {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-stats {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.size-comparison {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
}

.size-before {
    color: var(--text-secondary);
    text-decoration: line-through;
}

.size-after {
    color: var(--success);
    font-weight: 600;
}

.savings {
    color: var(--success);
    font-weight: 600;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--accent-primary);
    transition: width 0.3s;
}

.image-actions {
    display: flex;
    gap: 5px;
}

.icon-btn {
    background: var(--bg-tertiary);
    border: none;
    padding: 6px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
    font-size: 11px;
}

.icon-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.settings-panel {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px var(--shadow);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    cursor: pointer;
    user-select: none;
}

.settings-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.settings-content.collapsed {
    display: none;
}

.setting-group {
    margin-bottom: 15px;
}

.setting-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
}

.slider-value {
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--accent-primary);
}

input[type="number"],
select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
}

.preset-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 6px 12px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s;
}

.preset-btn:hover,
.preset-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.format-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 8px;
}

.format-option {
    position: relative;
}

.format-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.format-option label {
    display: block;
    padding: 8px;
    border: 2px solid var(--border);
    border-radius: 6px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 12px;
    font-weight: 600;
}

.format-option input[type="radio"]:checked + label {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-group label {
    cursor: pointer;
    font-size: 14px;
}

.download-bar {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.download-summary {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.summary-item {
    display: flex;
    flex-direction: column;
}

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

.summary-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent-primary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
    opacity: 0.3;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.processing {
    animation: pulse 1.5s ease-in-out infinite;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-primary);
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 1000;
    max-width: 300px;
    transform: translateX(400px);
    transition: transform 0.3s;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--success);
}

.notification.error {
    border-left: 4px solid var(--danger);
}

.hidden {
    display: none !important;
}