:root{color-scheme:light;font-family:ui-rounded,Avenir Next,Avenir,Segoe UI,sans-serif;color:#26231d;background:#d8d0be;font-synthesis:none;--ink: #26231d;--ink-soft: #625b4f;--paper: #f6f0df;--paper-bright: #fffaf0;--paper-deep: #e7dcc3;--desk: #d8d0be;--coral: #d95c4a;--teal: #397d75;--gold: #d29a2e;--shadow: rgba(46, 38, 26, .18);--line: rgba(38, 35, 29, .2);--accent: var(--coral);--accent-text: #11100d}*{box-sizing:border-box}html,body,#root{margin:0;min-width:100%;min-height:100%}body{min-height:100vh;min-height:100svh;overflow-x:hidden;background:radial-gradient(circle at 15% 8%,rgba(255,255,255,.54),transparent 28%),linear-gradient(145deg,var(--desk),#c9c0ad)}button{font:inherit}button:focus-visible{outline:4px solid var(--ink);outline-offset:3px}.app{--accent: var(--coral);--accent-text: #11100d;width:min(100%,880px);min-height:100vh;min-height:100svh;margin:0 auto;padding:max(14px,env(safe-area-inset-top)) 14px max(16px,env(safe-area-inset-bottom))}.app.accent-teal{--accent: var(--teal);--accent-text: var(--paper-bright)}.app.accent-gold{--accent: var(--gold);--accent-text: var(--ink)}.masthead{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin:0 3px 12px}.eyebrow{margin:0 0 2px;color:var(--accent);font-size:11px;font-weight:900;letter-spacing:.16em;line-height:1.4;text-transform:uppercase}h1{margin:0;font-family:Georgia,Times New Roman,serif;font-size:clamp(30px,9vw,44px);line-height:1.1;letter-spacing:-.04em}.subtitle{max-width:245px;margin:0 0 3px;color:var(--ink-soft);font-size:14px;font-weight:650;line-height:1.35;text-align:right}.mechanism-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:10px}.tab-button,.part-button,.run-button,.close-button{min-width:48px;min-height:48px;border:2px solid var(--ink);color:var(--ink);cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.tab-button{border-radius:14px 14px 6px 6px;background:var(--paper-deep);box-shadow:0 3px 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