:root{--bg: #f7f4ef;--ink: #27262b;--muted: #bdb5a9;--node: #e8e2d6;--active: #f4b55f;--green: #2daa62;--blue: #3f69f6;--panel: rgba(255, 255, 255, .92);--shadow: 0 14px 40px rgba(65, 44, 15, .12);--node-active: var(--active);--line: var(--node);--line-active: var(--active);--gold: var(--active);--accent: var(--blue);--accent-2: var(--green)}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Trebuchet MS,Avenir Next,sans-serif;color:var(--ink);-webkit-user-select:none;-webkit-touch-callout:none;user-select:none}input,textarea{-webkit-user-select:text;user-select:text}.app{width:min(100%,780px);margin:0 auto;padding:24px 20px 36px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.icon{display:grid;place-items:center;width:44px;height:44px;border:0;border-radius:50%;background:#fffdf9;color:var(--ink);font-family:inherit;font-size:26px;line-height:1;text-decoration:none;cursor:pointer;box-shadow:0 2px #412c0f1f,0 6px 14px #412c0f17;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.icon:hover,.icon:focus-visible{background:#fff;transform:translateY(-2px);box-shadow:0 4px #412c0f1f,0 10px 20px #412c0f1c}.icon:active{transform:translateY(1px);box-shadow:0 1px #412c0f1f,0 3px 8px #412c0f17}.icon svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}@keyframes pop{0%{opacity:0;transform:translateY(8px) scale(.9)}70%{transform:translateY(-2px) scale(1.03)}}#level-nav{display:inline-flex;align-items:center;gap:8px}.nav-btn{border:0;background:#fffdf9;color:#27262b;font-family:inherit;font-weight:800;line-height:1;cursor:pointer;box-shadow:0 2px #412c0f1f;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.nav-btn:hover,.nav-btn:focus-visible{background:#fff;transform:translateY(-1px);box-shadow:0 3px #412c0f1f}.nav-btn:active{transform:translateY(1px);box-shadow:0 0 #412c0f1f}#nav-prev,#nav-next{display:grid;place-items:center;width:36px;height:36px;padding:0;border-radius:50%;font-size:18px}.nav-pos{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:38px;min-width:90px;padding:0 18px;border-radius:999px;font-size:16px;letter-spacing:.02em}.nav-pos.done{background:#d8f4df;color:#176c3c;box-shadow:0 2px #2daa6238}.nav-pos.done:hover,.nav-pos.done:focus-visible{background:#cdefd6;box-shadow:0 3px #2daa6238}.nav-sub{font-size:12px;font-weight:800;opacity:.55}.nav-num,.nav-pos .nav-sub{display:inline-block;transform:translateY(1px)}