:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --success: #10b981;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

.resizer-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 968px) {
    .resizer-container {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}

h2 {
    margin-top: 0;
    color: #fff;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg-dark);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 1rem;
    display: block;
}

.upload-zone p {
    color: var(--text-muted);
    margin: 0.5rem 0;
}

#fileInput {
    display: none;
}

.canvas-container {
    position: relative;
    display: none;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

#imageCanvas {
    display: block;
    max-width: 100%;
    cursor: crosshair;
}

.presets-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preset-item {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-item:hover {
    border-color: var(--accent);
}

.preset-item.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent);
}

.preset-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.preset-name {
    font-weight: 600;
    color: var(--text-main);
}

.preset-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.preset-ratio {
    font-size: 0.8rem;
    color: var(--accent);
}

.btn {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
    width: 100%;
    margin-top: 10px;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

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

.btn-success:hover {
    background: #059669;
}

.download-all {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.crop-info {
    margin-top: 1rem;
    padding: 8px;
    background: var(--bg-dark);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}