:root{color-scheme:dark;--bg:#10121b;--panel:#191c29;--raised:#25283a;--text:#f5f4ff;--muted:#b6bbce;--line:#3a3e54;--accent:#c3b4ff;--tint:#342d4c;--good:#a4e3ce;--danger:#ffb4b4}:root[data-theme=light]{color-scheme:light;--bg:#f5f3f9;--panel:#fff;--raised:#eeeaf6;--text:#222133;--muted:#5a5e72;--line:#c9c5d5;--accent:#6748af;--tint:#eee7fa;--good:#216750;--danger:#a52841}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 system-ui,sans-serif}a{color:inherit;text-underline-offset:4px}button,.button{font:inherit;color:inherit;background:var(--raised);border:1px solid var(--line);border-radius:12px;padding:10px 14px;min-height:44px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}.primary{background:var(--tint);border-color:var(--accent)}button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.shell{width:min(1050px,calc(100% - 32px));margin:auto}header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:22px 0;border-bottom:1px solid var(--line)}.brand{text-decoration:none;font-size:14px;font-weight:800;letter-spacing:1px}nav{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:13px}nav a{text-decoration:none}.hero{max-width:780px;margin:35px 0 25px}.eyebrow{letter-spacing:2px;font-size:12px;color:var(--accent);font-weight:750}h1{font-size:clamp(36px,7vw,54px);margin:5px 0 14px;line-height:1.15}p{margin:8px 0}.fine{font-size:13px;color:var(--muted)}.overview,.help{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px}.overview{display:flex;align-items:center;justify-content:space-between;gap:18px}.overview strong{font-size:23px}.overview p{color:var(--muted);font-size:14px}progress{display:block;width:min(380px,100%);height:8px;accent-color:var(--accent);margin-top:12px}.legend{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin:22px 0;font-size:12px;color:var(--muted)}.chapter{max-width:800px;margin:30px auto;padding:0 12px}.chapter h2{font-size:18px;background:var(--tint);padding:10px 16px;border-radius:12px;text-align:center;margin:0 0 18px}.map-grid{position:relative;display:grid;width:100%;isolation:isolate}.map-lines{position:absolute;inset:0;width:100%;height:100%;overflow:visible;z-index:-1;pointer-events:none}.map-lines path{fill:none;stroke:var(--line);stroke-width:4;stroke-linejoin:round;stroke-linecap:round}.map-lines .branch-line{stroke:var(--accent);stroke-dasharray:5 4}.map-node{position:relative;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:4px;min-width:0;min-height:0;width:100%;height:100%;padding:7px;border:2px solid var(--line);border-radius:12px;background:var(--panel);text-decoration:none;box-shadow:0 5px 12px #00000015}.map-node.branch{background:var(--raised);border-style:dashed}.map-node.available{border-color:var(--accent);background:var(--tint)}.map-node.complete{border-color:var(--good)}.map-node.locked{color:var(--muted);box-shadow:none;cursor:not-allowed}.node-number{font-size:24px;line-height:1;font-weight:800}.node-title{font-size:15px;line-height:1.3;font-weight:650}.node-meta{font-size:11px;color:var(--muted)}.node-status{font-size:11px;font-weight:700}.map-node.available:hover,.map-node.complete:hover{transform:translateY(-2px);box-shadow:0 10px 24px #00000025}.help{margin:35px 0}.help h2{margin-top:0;font-size:22px}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.danger{color:var(--danger)}.message{padding:14px;border:1px solid var(--accent);border-radius:10px;margin-top:15px;background:var(--tint)}footer{padding:25px 0 35px;color:var(--muted);font-size:13px}.skip{position:absolute;top:-100px;left:10px;z-index:10;background:var(--panel);padding:10px}.skip:focus{top:10px}@media(max-width:800px){.shell{width:calc(100% - 24px)}nav{gap:10px}.overview{align-items:stretch;flex-direction:column;padding:18px}.chapter{padding:0 10px}.map-node{padding:3px;border-radius:8px;gap:2px}.node-number{font-size:19px}.node-title{font-size:11px;line-height:1.2;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}.node-meta{display:none}.node-status{font-size:9px;line-height:1.1}.chapter h2{font-size:16px}.help{padding:18px}}@media(max-width:360px){.node-title{font-size:10px}.node-number{font-size:16px}.node-status{font-size:8px}}@media(prefers-reduced-motion:reduce){.map-node{transform:none!important}}