:root{--panel-width: 340px;--panel-bg: #ffffff;--panel-border: #e2e2e2;--accent: #2563eb;--accent-light: #e8f0fe;--text: #1a1a1a;--text-secondary: #6b7280;--radius: 6px;--gap: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow:hidden;background:#f0f0f0;color:var(--text)}#viewer-container{position:absolute;inset:0}body.dev-mode #viewer-container{right:var(--panel-width)}#options-panel{display:none}body.dev-mode #options-panel{display:block;position:absolute;top:0;right:0;width:var(--panel-width);bottom:0;background:var(--panel-bg);border-left:1px solid var(--panel-border);overflow-y:auto;overflow-x:hidden}.panel-header{padding:16px 16px 12px;font-size:15px;font-weight:700;border-bottom:1px solid var(--panel-border);color:var(--text)}.panel-section{border-bottom:1px solid var(--panel-border)}.panel-section-header{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;cursor:pointer;font-weight:600;font-size:13px;user-select:none;transition:background .15s}.panel-section-header:hover{background:#f8f8f8}.panel-section-header .chevron{font-size:10px;color:var(--text-secondary);transition:transform .2s}.panel-section.open .panel-section-header .chevron{transform:rotate(90deg)}.panel-section-body{display:none;padding:4px 16px 12px}.panel-section.open .panel-section-body{display:block}.layout-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:10px}.layout-thumb{aspect-ratio:3/4;border:2px solid var(--panel-border);border-radius:var(--radius);cursor:pointer;padding:3px;display:flex;align-items:center;justify-content:center;transition:border-color .15s}.layout-thumb:hover{border-color:#999}.layout-thumb.active{border-color:var(--accent);background:var(--accent-light)}.layout-thumb svg{width:100%;height:100%}.opt-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}.opt-label{font-size:12px;color:var(--text-secondary);min-width:60px;flex-shrink:0}.opt-select{flex:1;padding:6px 8px;border:1px solid var(--panel-border);border-radius:var(--radius);font-size:12px;background:#fff;color:var(--text);appearance:auto}.opt-input{flex:1;padding:6px 8px;border:1px solid var(--panel-border);border-radius:var(--radius);font-size:12px}.opt-range{flex:1;accent-color:var(--accent)}.opt-value{font-size:12px;font-weight:600;color:var(--text);min-width:50px;text-align:right}.opt-color{width:28px;height:28px;border:1px solid var(--panel-border);border-radius:var(--radius);padding:0;cursor:pointer}.toggle-row{display:flex;gap:8px;margin-bottom:8px}.toggle-btn{flex:1;padding:6px 10px;border:1px solid var(--panel-border);border-radius:var(--radius);background:#fff;font-size:12px;cursor:pointer;text-align:center;transition:all .15s}.toggle-btn:hover{background:#f0f0f0}.toggle-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.section-badge{font-size:11px;color:var(--text-secondary);font-weight:400}.panel-section-title{display:flex;align-items:center;gap:8px}.section-num-chip{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;background:var(--accent);color:#fff;font-size:11px;font-weight:700;flex-shrink:0}