*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #ffffff;--surface: #f5f5f5;--surface2: #ebebeb;--border: #d0d0d0;--accent: #2563eb;--accent-hover: #1d4ed8;--text: #111111;--text-muted: #666666;--success: #16a34a;--warning: #b45309;--error: #dc2626;--radius: 8px;--radius-sm: 4px}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;min-height:100vh}.app{max-width:860px;margin:0 auto;padding:48px 24px 80px}.back-link{display:inline-block;color:var(--text-muted);text-decoration:none;font-size:13px;font-weight:600;margin-bottom:24px}.back-link:hover{color:var(--accent)}.header{text-align:center;margin-bottom:40px}.header h1{font-size:2rem;font-weight:700;letter-spacing:-.02em}.subtitle{color:var(--text-muted);margin-top:8px}.dropzone{border:2px dashed var(--border);border-radius:var(--radius);background:var(--surface);padding:56px 24px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;outline:none}.dropzone:hover,.dropzone:focus{border-color:var(--accent);background:var(--surface2)}.dropzone.dragover{border-color:var(--accent);background:var(--surface2)}.dropzone__inner{pointer-events:none}.dropzone__icon{color:var(--text-muted);margin:0 auto 16px;display:block}.dropzone__text{font-size:1rem;color:var(--text)}.dropzone__browse{color:var(--accent);text-decoration:underline}.dropzone__hint{color:var(--text-muted);font-size:12px;margin-top:6px}.error{margin-top:20px;padding:12px 16px;background:#fef2f2;border:1px solid var(--error);border-radius:var(--radius-sm);color:var(--error);font-size:13px}.preview{margin-top:32px}.preview__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:14px}.preview-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:center}.preview-card__img{max-width:100%;height:auto;border-radius:var(--radius-sm);background:var(--surface2);display:block}.preview-card__dims{font-weight:600;font-size:13px}.preview-card__name{color:var(--text-muted);font-size:11.5px;word-break:break-all}.snippet{margin-top:24px}.snippet__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.control-label{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.textarea{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;padding:10px 12px;resize:vertical;outline:none;transition:border-color .15s}.textarea:focus{border-color:var(--accent)}.textarea[readonly]{background:var(--bg)}.preview__actions{display:flex;justify-content:flex-end;gap:12px;margin-top:20px;padding-top:20px;border-top:1px solid var(--border)}.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:background .15s,color .15s,border-color .15s;white-space:nowrap;line-height:1;text-decoration:none}.btn--primary{background:var(--accent);color:#fff}.btn--primary:hover{background:var(--accent-hover)}.btn--secondary{background:transparent;color:var(--text-muted);border-color:var(--border)}.btn--secondary:hover{color:var(--text);border-color:var(--text-muted)}.btn--sm{padding:6px 12px;font-size:13px}.btn:disabled{opacity:.4;cursor:not-allowed}@media(max-width:540px){.preview__grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}.preview__actions{flex-direction:column-reverse}.preview__actions .btn{width:100%;justify-content:center}}