:root {
    --bg-color: #0d0f14;
    --surface-color: #151821;
    --surface-hover: #1f2330;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: rgba(255, 255, 255, 0.1);
    --success-color: #10b981;
    --danger-color: #ef4444;
    --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
    --border-radius: 12px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, #fff, #93c5fd);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Drop Zone */
.upload-section {
    margin-bottom: 3rem;
}

.drop-zone {
    background: var(--surface-color);
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

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

.drop-content {
    pointer-events: none;
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.drop-zone h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.meta-hint {
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    display: inline-block;
}

/* Results Section */
.results-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    animation: slideUp 0.5s ease;
}

.results-section.hidden {
    display: none;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.preview-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.preview-panel h3 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.preview-container {
    position: relative;
    width: 256px;
    height: 256px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

#preview-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.safe-margin-mask {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50%;
    border: 2px dashed rgba(255, 0, 0, 0.5);
    background: radial-gradient(circle, transparent 72%, rgba(0, 0, 0, 0.6) 73%);
    pointer-events: none;
}

.preview-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
}

.action-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.status-box {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.status-box h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.asset-list {
    list-style: none;
}

.asset-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.icon-check {
    color: var(--success-color);
    font-weight: bold;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.btn.primary {
    background: var(--accent-color);
    border-color: var(--accent-color);
    padding: 1rem 1.5rem;
}

.btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn.text-btn {
    border: none;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 4px;
    width: auto;
}

.btn.text-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Code Snippet */
.code-snippet-box {
    background: rgba(0, 0, 0, 0.4);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.code-snippet-box h3 {
    padding: 1rem 1.5rem 0.5rem;
    font-size: 1rem;
}

.snippet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

pre {
    margin: 0;
    padding: 1rem 1.5rem;
    overflow-x: auto;
}

code {
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    color: #a5b4fc;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: none;
    z-index: 100;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.error-toast {
    background: var(--danger-color);
    color: white;
}

.footer {
    text-align: center;
    margin-top: 4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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