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auto;padding:0 16px}.topbar{background:var(--navy);color:#fff;padding:12px 0 14px;position:relative}.topbar .wrap{align-items:center;gap:10px;display:flex}.topbar .brand{color:#fff;flex-direction:column;min-width:0;line-height:1.2;text-decoration:none;display:flex}.brand .b1{letter-spacing:.08em;text-transform:uppercase;opacity:.85;font-size:.72rem;font-weight:600}.brand .b2{font-size:1.06rem;font-weight:700}.topbar .back{color:#fff;cursor:pointer;background:#ffffff1f;border:0;border-radius:10px;flex:none;place-items:center;min-width:44px;height:44px;text-decoration:none;display:grid}.topbar h1{overflow-wrap:anywhere;margin:0;font-size:1.08rem;font-weight:700}.bottomnav{z-index:50;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);background:#fff;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -2px 12px #1020360f}.bottomnav ul{grid-template-columns:repeat(4,1fr);max-width:680px;margin:0 auto;padding:0;list-style:none;display:grid}.bottomnav 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0;border:0;flex:1;padding:0 10px;font-size:1.05rem}.searchbox input:focus{outline:none}.searchbox button{flex:none}.updated{background:#ffffff1f;border-radius:999px;align-items:center;gap:6px;margin-top:12px;padding:4px 10px;font-size:.82rem;display:inline-flex}.quick{grid-template-columns:1fr 1fr;gap:10px;margin-top:14px;display:grid}.quick a{border-radius:var(--radius);min-height:64px;box-shadow:var(--shadow);color:var(--ink);background:#fff;align-items:center;gap:10px;padding:12px;font-weight:650;line-height:1.25;text-decoration:none;display:flex}.quick .ic{background:var(--navy-soft);width:38px;height:38px;color:var(--navy);border-radius:10px;flex:none;place-items:center;display:grid}.list{margin:0;padding:0;list-style:none}.list>li>a,.list>li>button{text-align:left;border:0;border-bottom:1px solid var(--line);width:100%;min-height:56px;color:var(--ink);cursor:pointer;background:#fff;justify-content:space-between;align-items:center;gap:12px;padding:14px 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100%) 0 0/200% 100%;border-radius:10px;height:18px;margin:10px 0;animation:1.2s infinite sk}@keyframes sk{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion:reduce){.skeleton{animation:none}}.chat{flex-direction:column;gap:10px;padding:12px 0;display:flex}.bubble{overflow-wrap:anywhere;border-radius:16px;max-width:92%;padding:10px 14px}.bubble.me{background:var(--navy);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.bubble.bot{box-shadow:var(--shadow);background:#fff;border-bottom-left-radius:4px;align-self:flex-start}.composer{bottom:calc(var(--nav-h) + env(safe-area-inset-bottom));background:var(--bg);padding:8px 0 10px;position:-webkit-sticky;position:sticky}.sheet-backdrop{z-index:80;background:#0a142373;justify-content:center;align-items:flex-end;display:flex;position:fixed;top:0;bottom:0;left:0;right:0}.sheet{width:100%;max-width:680px;padding:18px 16px calc(18px + env(safe-area-inset-bottom));background:#fff;border-radius:18px 18px 0 0;max-height:90vh;overflow:auto}.sheet h2{margin:0 0 8px;font-size:1.1rem}.toast{left:50%;bottom:calc(var(--nav-h) + 20px);background:var(--ink);color:#fff;z-index:90;border-radius:10px;max-width:calc(100% - 32px);padding:10px 16px;font-size:.92rem;position:fixed;transform:translate(-50%)}.block{margin:12px 0}.block p{margin:6px 0 0}.qr{align-items:center;gap:14px;display:flex}.qr img{border:1px solid var(--line);background:#fff;border-radius:8px;width:128px;height:128px}.quiz-opt{text-align:left;width:100%;margin:6px 0;display:block}.quiz-opt.right{border-color:var(--green);background:var(--green-soft)}.quiz-opt.wrong{border-color:var(--red);background:var(--red-soft)}.tree details{border-bottom:1px solid var(--line)}.tree summary{cursor:pointer;min-height:48px;padding:12px 4px;font-weight:650}.tree .pts{flex-wrap:wrap;gap:6px;padding:0 4px 12px;display:flex}.tree .pts a{border:1px solid var(--line);border-radius:10px;place-items:center;min-width:44px;min-height:40px;padding:0 10px;font-weight:650;text-decoration:none;display:inline-grid}.preview-banner{color:#fff;text-align:center;background:#b45309;padding:6px;font-size:.9rem;font-weight:700}.footer-note{color:var(--muted);margin:24px 0 8px;font-size:.82rem}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.btn svg:not([width]){flex:none;width:22px;height:22px}.quick .ic svg{width:24px;height:24px}.state .icon svg{width:48px;height:48px}