:root{--bg:#f4f5f7;--panel:#fff;--ink:#1c2024;--ink-soft:#5b636b;--line:#e2e5e9;--accent:#2a2f36;--accent-ink:#fff;--sel-ring:#1c2024;--shadow:0 1px 3px #14181c14, 0 8px 24px #14181c0f;--radius:12px;--radius-sm:8px;font-size:16px}*{box-sizing:border-box}[hidden]{display:none!important}html,body{height:100%;margin:0}body{background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;flex-direction:column;min-height:100vh;font-family:-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;display:flex}.app-header{background:var(--panel);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;padding:14px 24px;display:flex}.brand h1{letter-spacing:-.01em;margin:0;font-size:1.15rem;font-weight:650}.subtitle{color:var(--ink-soft);margin:2px 0 0;font-size:.8rem}.selected-indicator{background:var(--bg);border:1px solid var(--line);border-radius:999px;align-items:center;gap:10px;padding:6px 12px 6px 6px;display:flex}.sel-swatch{border:1px solid #14181c26;border-radius:50%;width:28px;height:28px;display:inline-block}.sel-code{letter-spacing:.01em;font-size:.85rem;font-weight:600}.app-main{flex:1;grid-template-columns:minmax(0,1fr) 340px;gap:20px;min-height:0;padding:20px 24px;display:grid}.stage{flex-direction:column;min-width:0;display:flex}.tabs{background:var(--panel);border:1px solid var(--line);border-radius:999px;align-self:flex-start;gap:4px;margin-bottom:14px;padding:4px;display:inline-flex}.tab{color:var(--ink-soft);cursor:pointer;background:0 0;border:0;border-radius:999px;padding:8px 20px;font-size:.9rem;font-weight:550;transition:background .15s,color .15s}.tab:hover{color:var(--ink)}.tab.active{background:var(--accent);color:var(--accent-ink)}.canvas-wrap{background:var(--panel);border:1px solid 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