.masthead{background:var(--surface);border-bottom:1px solid var(--line)}.masthead-in{flex-wrap:wrap;align-items:center;gap:14px;max-width:1180px;margin:0 auto;padding:10px 24px;display:flex}@media (max-width:600px){.masthead-in{padding:10px 16px}}.mark{background:var(--primary);width:34px;height:34px;color:var(--on-primary);font-family:var(--font-serif);border-radius:8px;flex:none;place-items:center;font-size:18px;font-weight:700;display:grid}.brand{flex-direction:column;line-height:1.2;display:flex}.brand b{font-size:15px;font-weight:600}.brand span{color:var(--ink-3);font-size:12px}.theme-btn{border:1px solid var(--line-strong);color:var(--ink-2);cursor:pointer;background:0 0;border-radius:8px;min-width:44px;min-height:44px;margin-left:auto;padding:5px 12px;font-size:13px}.theme-btn:hover{border-color:var(--primary);color:var(--primary-ink)}.shell{grid-template-columns:minmax(0,1fr) 316px;align-items:start;gap:32px;max-width:1180px;margin:0 auto;padding:28px 24px 64px;display:grid}.shell-narrow{grid-template-columns:minmax(0,760px);justify-content:center}@media (max-width:940px){.shell{grid-template-columns:minmax(0,1fr);gap:24px;padding:20px 16px 48px}}.stage{min-width:0}.stage h1:focus,.stage h2:focus{outline:none}.progress-head{align-items:baseline;gap:12px;margin-bottom:10px;display:flex}.progress-head .step-n{font-family:var(--font-mono);color:var(--ink-3);font-variant-numeric:tabular-nums;font-size:12px}.progress-head .step-t{color:var(--ink-2);font-size:13px;font-weight:500}.track{background:var(--line);border-radius:999px;height:5px;overflow:hidden}.track-fill{width:100%;height:100%;display:block}.track-fill rect{fill:var(--primary);transition:width .35s cubic-bezier(.2,.7,.3,1)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.q-card{margin-top:18px;padding:26px 28px 24px}@media (max-width:600px){.q-card{padding:20px 18px}}.q-why{align-items:center;gap:7px;margin-bottom:12px;display:inline-flex}.q-why .dot{background:var(--accent);border-radius:50%;flex:none;width:5px;height:5px}h2.q{margin-bottom:8px;font-size:26px;line-height:1.25}@media (max-width:600px){h2.q{font-size:22px}}.q-help{color:var(--ink-2);max-width:60ch;font-size:14.5px}.section-h{margin:26px 0 6px;font-size:20px;line-height:1.3}.opts{flex-direction:column;gap:9px;margin-top:20px;display:flex}.opt{text-align:left;cursor:pointer;background:var(--surface-2);border:1.5px solid var(--line);border-radius:9px;grid-template-columns:22px minmax(0,1fr) 20px;align-items:start;gap:13px;width:100%;min-height:44px;padding:13px 15px;transition:border-color .14s,background .14s;display:grid}.opt:hover{border-color:var(--line-strong)}.opt[aria-checked=true]{border-color:var(--primary);background:var(--primary-soft)}.opt .key{font-family:var(--font-mono);color:var(--ink-3);border:1px solid var(--line-strong);border-radius:4px;flex:none;place-items:center;width:22px;height:22px;margin-top:1px;font-size:11px;display:grid}.opt[aria-checked=true] .key{border-color:var(--primary);color:var(--primary-ink);background:var(--surface)}.opt .lab{font-size:16px;font-weight:600;line-height:1.35;display:block}.opt .sub{color:var(--ink-2);margin-top:3px;font-size:13.5px;line-height:1.45;display:block}.opt .tick{border:1.5px solid var(--line-strong);border-radius:50%;width:20px;height:20px;margin-top:2px;position:relative}.opt[aria-checked=true] .tick{border-color:var(--primary);background:var(--primary)}.opt[aria-checked=true] .tick:after{content:"";border:solid var(--on-primary);border-width:0 2px 2px 0;width:5px;height:10px;position:absolute;top:2.5px;left:6px;transform:rotate(42deg)}.opt.multi .tick{border-radius:5px}.nav{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:12px;margin-top:24px;padding-top:20px;display:flex}.btn{cursor:pointer;border:1.5px solid #0000;border-radius:8px;justify-content:center;align-items:center;min-height:44px;padding:11px 20px;font-size:15px;font-weight:600;text-decoration:none;transition:filter .14s,border-color .14s;display:inline-flex}.btn-primary{background:var(--primary);color:var(--on-primary)}.btn-primary:hover{filter:brightness(1.12)}.btn-primary:disabled{opacity:.4;cursor:not-allowed;filter:none}.btn-ghost{border-color:var(--line-strong);color:var(--ink-2);background:0 0}.btn-ghost:hover{border-color:var(--primary);color:var(--primary-ink)}.nav .spacer{margin-left:auto}.hint{color:var(--ink-3);font-size:12px;font-family:var(--font-mono)}@media (max-width:600px){.hint{display:none}}.intro-h{margin:6px 0 10px;font-size:34px;line-height:1.15}@media (max-width:600px){.intro-h{font-size:27px}}.intro-lede{color:var(--ink-2);max-width:62ch;font-size:16px}.intro-lede+.intro-lede{margin-top:12px}.paths{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:22px 0 4px;display:grid}@media (max-width:700px){.paths{grid-template-columns:1fr}}.path-mini{border:1px solid var(--line);background:var(--surface-2);border-radius:9px;flex-direction:column;gap:6px;padding:13px 14px;display:flex}.path-mini b{font-size:14px;font-weight:600;line-height:1.3}.path-mini span{color:var(--ink-2);font-size:12.5px;line-height:1.45}.path-mini .idx{font-family:var(--font-mono);color:var(--accent-ink);letter-spacing:.06em;font-size:11px}.disclaimer{color:var(--ink-3);border:1px dashed var(--line-strong);background:var(--surface);border-radius:9px;margin-top:16px;padding:14px 16px;font-size:12px;line-height:1.6}.disclaimer b{color:var(--ink-2)}.disclaimer-intro{margin-top:18px}.site-footer{max-width:1180px;color:var(--ink-3);margin:0 auto;padding:0 24px 40px;font-size:12px;line-height:1.6}.site-footer p+p{margin-top:6px}.site-footer a{color:var(--primary-ink)}@media (max-width:940px){.site-footer{padding:0 16px 32px}}