:root{--bg:#f4f1e9;--surface:#fffdf8;--surface-2:#ebe7dc;--ink:#17241e;--muted:#647068;--brand:#274d3b;--brand-2:#7f9c82;--line:#d9d4c8;--good:#2d6b47;--warn:#8a5f18;--bad:#8a3f36;--shadow:0 12px 32px rgba(34,45,38,.08);--radius:22px}
:root[data-theme="dark"]{--bg:#101714;--surface:#17201c;--surface-2:#202b25;--ink:#edf3ef;--muted:#abb8b0;--brand:#9dc4a8;--brand-2:#779884;--line:#304039;--good:#89c79c;--warn:#e1bd75;--bad:#e4a099;--shadow:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-rounded,"SF Pro Rounded","Avenir Next",Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.48}button,input,select{font:inherit}a{color:inherit}.app-shell{min-height:100vh;padding-bottom:84px}
.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right));background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.brand{display:flex;gap:10px;align-items:center;text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:14px;background:var(--brand);color:var(--bg);display:grid;place-items:center;font-weight:900;font-size:12px;letter-spacing:.04em}.brand strong{display:block;font-size:16px}.brand small{display:block;color:var(--muted);font-size:11px}.top-actions{display:flex;gap:8px}.icon-btn,.btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:14px;padding:10px 14px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.icon-btn{width:42px;height:42px;padding:0}.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--bg);font-weight:800}.btn.good{background:var(--good);border-color:var(--good);color:#fff;font-weight:800}.btn.ghost{background:transparent}.btn.danger{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 40%,var(--line))}.btn:disabled{opacity:.45;cursor:not-allowed}
main{max-width:980px;margin:0 auto;padding:24px 18px 36px}.hero{padding:28px;border:1px solid var(--line);border-radius:28px;background:linear-gradient(135deg,var(--surface),color-mix(in srgb,var(--brand-2) 16%,var(--surface)));box-shadow:var(--shadow)}.eyebrow{text-transform:uppercase;letter-spacing:.13em;color:var(--brand);font-size:12px;font-weight:900}h1{font-size:clamp(31px,8vw,54px);line-height:1.01;margin:8px 0 12px;letter-spacing:-.045em}h2{font-size:25px;line-height:1.08;margin:0 0 10px;letter-spacing:-.025em}h3{font-size:18px;margin:0 0 8px}p{margin:7px 0}.lede{font-size:17px;color:var(--muted);max-width:720px}.hero-actions,.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.hero-actions{margin-top:18px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.metric{font-size:34px;font-weight:900;letter-spacing:-.04em}.muted{color:var(--muted)}.small{font-size:12px}.section{margin-top:28px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:14px;margin-bottom:12px}.progress-track{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden;margin-top:10px}.progress-bar{height:100%;background:var(--brand);border-radius:inherit}.chip-row{display:flex;gap:8px;overflow:auto;padding-bottom:4px}.chip{white-space:nowrap;border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:999px;padding:8px 12px;cursor:pointer}.chip.active{background:var(--brand);color:var(--bg);border-color:var(--brand)}
.list{display:grid;gap:10px}.lesson-row,.skill-row{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;border:1px solid var(--line);background:var(--surface);padding:16px;border-radius:18px}.tag{display:inline-flex;border-radius:999px;background:var(--surface-2);padding:5px 9px;font-size:11px;color:var(--muted);font-weight:700}.detail{margin-top:12px;border-top:1px solid var(--line);padding-top:14px}.detail ul,.detail ol{padding-left:21px}.detail li{margin:8px 0}.search{width:100%;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:14px 15px;border-radius:16px;outline:none}.search:focus{border-color:var(--brand)}
.question-card{max-width:760px;margin:16px auto 0}.q-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px}.question{font-size:22px;line-height:1.24;font-weight:850;margin:16px 0}.choices{display:grid;gap:10px}.choice{width:100%;text-align:left;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:14px;border-radius:15px;cursor:pointer}.choice:hover{border-color:var(--brand-2)}.choice.correct{border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,var(--surface))}.choice.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 11%,var(--surface))}.rationale{margin-top:14px;padding:14px;border-left:4px solid var(--brand);background:var(--surface-2);border-radius:12px}.toolbar select{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:14px;padding:10px 12px}.score-big{font-size:56px;font-weight:950;letter-spacing:-.06em}.state-banner{border-left:5px solid var(--brand)}.notice{background:color-mix(in srgb,var(--warn) 10%,var(--surface));border:1px solid color-mix(in srgb,var(--warn) 35%,var(--line));padding:14px;border-radius:16px}.good-note{background:color-mix(in srgb,var(--good) 10%,var(--surface));border:1px solid color-mix(in srgb,var(--good) 35%,var(--line));padding:14px;border-radius:16px}.source-link{display:block;text-decoration:none}.source-link:hover h3{text-decoration:underline}.footer-box{margin-top:32px;padding:18px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}
.bottom-nav{position:fixed;left:50%;bottom:max(10px,env(safe-area-inset-bottom));transform:translateX(-50%);z-index:30;width:min(94%,650px);display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(22px);box-shadow:var(--shadow);border-radius:20px;padding:6px}.bottom-nav a{text-align:center;text-decoration:none;color:var(--muted);padding:10px 5px;border-radius:14px;font-size:12px;font-weight:800}.bottom-nav a.active{background:var(--brand);color:var(--bg)}hr{border:0;border-top:1px solid var(--line);margin:20px 0}details{border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:14px}details+details{margin-top:9px}summary{cursor:pointer;font-weight:800}.toast{position:fixed;left:50%;bottom:100px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 14px;border-radius:999px;z-index:99;font-size:12px;font-weight:800;box-shadow:var(--shadow)}
@media(max-width:720px){.grid,.grid.three{grid-template-columns:1fr}main{padding:18px 14px 34px}.hero{padding:22px}.topbar{padding-top:max(10px,env(safe-area-inset-top))}.btn.ghost#installBtn{display:none}.lesson-row,.skill-row{grid-template-columns:1fr}.lesson-row>.toolbar,.skill-row>.toolbar{justify-content:flex-start}}