* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: #f5f5f7; color: #1d1d1f; min-height: 100vh; }

.header { background: #fff; padding: 16px 24px; border-bottom: 1px solid #d2d2d7; display: flex; align-items: center; gap: 16px; }
.header h1 { font-size: 18px; font-weight: 600; color: #1d1d1f; }

.container { display: flex; height: calc(100vh - 57px); }

.sidebar { width: 320px; min-width: 320px; background: #fff; border-right: 1px solid #d2d2d7; padding: 16px; overflow-y: auto; display: flex; flex-direction: column; gap: 16px; }

.main { flex: 1; padding: 16px; overflow: auto; display: flex; flex-direction: column; align-items: center; gap: 12px; }

.section { background: #f5f5f7; border: 1px solid #d2d2d7; border-radius: 8px; padding: 12px; }
.section h3 { font-size: 13px; color: #86868b; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }

input[type="file"] { display: none; }
.file-btn { display: inline-block; padding: 8px 16px; background: #0071e3; border: none; border-radius: 6px; color: #fff; cursor: pointer; font-size: 13px; text-align: center; width: 100%; transition: background 0.2s; }
.file-btn:hover { background: #0077ed; }

.slider-row { display: flex; align-items: center; gap: 8px; }
.slider-row input[type="range"] { flex: 1; accent-color: #0071e3; }
.slider-val { font-size: 14px; font-weight: 600; min-width: 28px; text-align: right; color: #1d1d1f; }

.swatches { display: flex; flex-direction: column; gap: 6px; }
.swatch-group { border: 1px solid #d2d2d7; border-radius: 6px; padding: 6px; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; background: #fff; cursor: pointer; transition: border-color 0.15s, box-shadow 0.15s; }
.swatch-group:hover { border-color: #0071e3; }
.swatch-group-active { border-color: #0071e3; box-shadow: 0 0 0 2px rgba(0,113,227,0.3); }
.swatch-group .group-label { font-size: 10px; color: #86868b; width: 100%; margin-bottom: 2px; }
.swatch { width: 24px; height: 24px; border-radius: 4px; border: 1px solid rgba(0,0,0,0.12); position: relative; }
.swatch:hover::after { content: attr(title); position: absolute; bottom: 110%; left: 50%; transform: translateX(-50%); background: #1d1d1f; color: #fff; padding: 2px 6px; border-radius: 3px; font-size: 10px; white-space: nowrap; z-index: 10; }

.export-btn { padding: 10px 16px; background: #30d158; border: none; border-radius: 6px; color: #fff; cursor: pointer; font-size: 14px; font-weight: 600; width: 100%; transition: background 0.2s; }
.export-btn:hover { background: #28c04e; }
.export-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.preview-area { border: 1px solid #d2d2d7; border-radius: 8px; background: repeating-conic-gradient(#e8e8e8 0% 25%, #fff 0% 50%) 50% / 16px 16px; overflow: hidden; display: flex; align-items: center; justify-content: center; max-width: 100%; min-height: 300px; flex: 1; width: 100%; }
.preview-area svg { max-width: 100%; max-height: 100%; }

.info { font-size: 13px; color: #86868b; text-align: center; padding: 40px; }
.status { font-size: 12px; color: #86868b; margin-top: 4px; }
.status.error { color: #ff3b30; font-weight: 500; line-height: 1.4; }

/* Loading overlay */
.loading-overlay { position: fixed; inset: 0; background: rgba(255,255,255,0.85); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 1000; transition: opacity 0.2s; backdrop-filter: blur(4px); }
.spinner { width: 48px; height: 48px; border: 4px solid #d2d2d7; border-top-color: #0071e3; border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { margin-top: 16px; font-size: 14px; color: #1d1d1f; }
.loading-progress { margin-top: 8px; font-size: 12px; color: #86868b; }
.progress-bar-wrap { width: 200px; height: 6px; background: #e8e8e8; border-radius: 3px; margin-top: 12px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: #0071e3; border-radius: 3px; transition: width 0.3s; }

.drag-active { outline: 3px dashed #0071e3; outline-offset: -3px; }