:root {
    --bg-app: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --brand-color: #4f46e5;
    --brand-hover: #4338ca;
    --brand-bg: #eef2ff;
    --success-color: #16a34a;
    --success-hover: #15803d;
    --success-bg: #f0fdf4;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --pattern-bg: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0iI2Y5ZmRmZCI+PHJlY3Qgd2lkdGg9IjEwIiBoZWlnaHQ9IjEwIiBmaWxsPSIjZjJmMmYyIi8+PHJlY3QgeD0iMTAiIHk9IjEwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIGZpbGw9IiNmMmYyZjIiLz48L3N2Zz4=");
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-app: #0f172a;
        --bg-card: #1e293b;
        --border-color: #334155;
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --brand-color: #818cf8;
        --brand-hover: #6366f1;
        --brand-bg: rgba(79, 70, 229, 0.15);
        --success-color: #4ade80;
        --success-hover: #22c55e;
        --success-bg: rgba(22, 163, 74, 0.15);
        --danger-color: #f87171;
        --danger-hover: #ef4444;
        --pattern-bg: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0ibm9uZSI+PHJlY3Qgd2lkdGg9IjIwIiBoZWlnaHQ9IjIwIiBmaWxsPSIjMWUyOTNiIi8+PHJlY3Qgd2lkdGg9IjEwIiBoZWlnaHQ9IjEwIiBmaWxsPSIjMGYxNzJhIi8+PHJlY3QgeD0iMTAiIHk9IjEwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIGZpbGw9IiMwZjE3MmEiLz48L3N2Zz4=");
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-app);
    color: var(--text-main);
    padding: 16px;
    line-height: 1.5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.header {
    text-align: center;
    margin-bottom: 24px;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--text-main);
}

.header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 4px;
}

.upload-box {
    background-color: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.upload-box:active, .upload-box.dragover {
    border-color: var(--brand-color);
    background-color: var(--brand-bg);
}

.upload-box svg {
    color: var(--brand-color);
    margin-bottom: 12px;
}

.upload-box p {
    font-weight: 600;
    font-size: 1rem;
}

.upload-box span {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: block;
    margin-top: 4px;
}

.hidden {
    display: none !important;
}

.actions-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 12px 20px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: background-color 0.15s, transform 0.1s;
}

.btn-full { width: 100%; }
.btn-primary { background-color: var(--brand-color); color: #fff; }
.btn-primary:hover { background-color: var(--brand-hover); }
.btn-success { background-color: var(--success-color); color: #fff; }
.btn-success:hover { background-color: var(--success-hover); }
.btn-danger { background-color: transparent; border: 1px solid var(--border-color); color: var(--danger-color); }
.btn-danger:hover { background-color: rgba(220, 38, 38, 0.08); }

.active-scale:active {
    transform: scale(0.97);
}

.preview-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card {
    background-color: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 12px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media(min-width: 600px) {
    .card {
        grid-template-columns: 1fr 1fr;
    }
}

.panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel.highlight { border-color: rgba(129, 140, 248, 0.4); }
.panel.success { border-color: rgba(22, 163, 74, 0.4); }

.panel-header {
    background-color: rgba(0,0,0,0.02);
    padding: 8px 12px;
    font-size: 0.75rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

.text-brand { color: var(--brand-color); }
.text-success { color: var(--success-color); }

.panel-body {
    padding: 12px;
    overflow: hidden;
}

.panel-body.pattern {
    background-image: var(--pattern-bg);
}

.height-mobile {
    height: 220px;
}

@media(min-width: 600px) {
    .height-mobile { height: 260px; }
}

.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 4px; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.info-tag {
    font-family: monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.img-preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

.panel-footer {
    padding: 8px 12px;
    border-top: 1px solid var(--border-color);
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--border-color);
    border-bottom-color: var(--brand-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    50% { opacity: 0.5; }
}
.animate-pulse { animation: pulse 1.5s infinite ease-in-out; }

@media(max-width: 480px) {
    body { padding: 12px; }
    .header h1 { font-size: 1.5rem; }
    .btn-mobile { width: 100%; padding: 14px; font-size: 0.95rem; }
    .actions-bar { flex-direction: column; gap: 8px; }
}