:root{--font-body: "Assistant", "Segoe UI", Arial, sans-serif;--font-head: "Rubik", "Assistant", "Segoe UI", Arial, sans-serif;--base: 17px;--bg: #f5f6fa;--bg-soft: #eceff6;--surface: #ffffff;--surface-2: #f8f9fc;--ink: #141a2e;--ink-2: #444c63;--ink-3: #5f6880;--line: #dde1ec;--line-strong: #c3c9d9;--primary: #2443c2;--primary-ink: #ffffff;--on-color: #ffffff;--primary-soft: #e6ebfb;--primary-strong: #1a3196;--accent: #ffc533;--accent-ink: #3a2a00;--ok: #157347;--ok-soft: #e3f4ea;--bad: #c0262d;--bad-soft: #fde8e8;--warn: #9a5b00;--warn-soft: #fff3d6;--topic-1: #6d4bd8;--topic-2: #2468d6;--topic-3: #0b7268;--topic-4: #ad4e0c;--focus: #ffb000;--radius: 18px;--radius-sm: 12px;--shadow: 0 1px 2px rgba(20, 26, 46, .06), 0 8px 24px rgba(20, 26, 46, .06);--shadow-lg: 0 2px 6px rgba(20, 26, 46, .08), 0 24px 48px rgba(20, 26, 46, .12);--ease: cubic-bezier(.2, .7, .2, 1);color-scheme:light}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #0e1220;--bg-soft: #151a2c;--surface: #171c2f;--surface-2: #1d2339;--ink: #eef1fa;--ink-2: #c3c9db;--ink-3: #9aa3bb;--line: #2a3150;--line-strong: #3a4366;--primary: #7d98ff;--primary-ink: #0b1022;--on-color: #0b1022;--primary-soft: #1f2a55;--primary-strong: #a8baff;--ok: #4cc98a;--ok-soft: #10301f;--bad: #ff7b7b;--bad-soft: #3a1518;--warn: #ffc56b;--warn-soft: #3a2a0c;--topic-1: #a48bff;--topic-2: #6aa3ff;--topic-3: #3fd1c0;--topic-4: #ff9d5c;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);--shadow-lg: 0 24px 48px rgba(0, 0, 0, .45);color-scheme:dark}}:root[data-theme=dark]{--bg: #0e1220;--bg-soft: #151a2c;--surface: #171c2f;--surface-2: #1d2339;--ink: #eef1fa;--ink-2: #c3c9db;--ink-3: #9aa3bb;--line: #2a3150;--line-strong: #3a4366;--primary: #7d98ff;--primary-ink: #0b1022;--on-color: #0b1022;--primary-soft: #1f2a55;--primary-strong: #a8baff;--ok: #4cc98a;--ok-soft: #10301f;--bad: #ff7b7b;--bad-soft: #3a1518;--warn: #ffc56b;--warn-soft: #3a2a0c;--topic-1: #a48bff;--topic-2: #6aa3ff;--topic-3: #3fd1c0;--topic-4: #ff9d5c;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);--shadow-lg: 0 24px 48px rgba(0, 0, 0, .45);color-scheme:dark}:root[data-text-size="1"]{--base: 19px}:root[data-text-size="2"]{--base: 22px}:root[data-readable=true]{--font-body: Arial, "Segoe UI", sans-serif;--font-head: Arial, "Segoe UI", sans-serif}:root[data-readable=true] body{letter-spacing:.01em;word-spacing:.06em;line-height:1.8}:root[data-contrast=true]{--bg: #ffffff;--bg-soft: #ffffff;--surface: #ffffff;--surface-2: #ffffff;--ink: #000000;--ink-2: #000000;--ink-3: #1a1a1a;--line: #000000;--line-strong: #000000;--primary: #0018a8;--primary-ink: #ffffff;--on-color: #ffffff;--primary-strong: #000c66;--primary-soft: #e8ebff;--accent-ink: #000000;--ok: #005c2e;--ok-soft: #e3f4ea;--bad: #a00000;--bad-soft: #fde8e8;--warn: #6b3f00;--warn-soft: #fff3d6;--topic-1: #4a2bb0;--topic-2: #0b4bb0;--topic-3: #005c54;--topic-4: #8a3a00;--shadow: none;--shadow-lg: none;color-scheme:light}:root[data-contrast=true] .card,:root[data-contrast=true] .btn{border-width:2px}:root[data-calm=true] *,:root[data-calm=true] *:before,:root[data-calm=true] *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}*,*:before,*:after{box-sizing:border-box}html{font-size:var(--base);-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3,h4{font-family:var(--font-head);line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em;text-wrap:balance}h1{font-size:clamp(1.7rem,4vw,2.4rem);font-weight:700}h2{font-size:clamp(1.3rem,2.6vw,1.6rem);font-weight:650}h3{font-size:1.12rem;font-weight:600}p{margin:0 0 1em}a{color:var(--primary);text-underline-offset:3px}img{max-width:100%;display:block}button,input,select,textarea{font:inherit;color:inherit}::selection{background:var(--accent);color:#000}:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}.skip-link{position:absolute;inset-inline-start:12px;top:-60px;z-index:100;background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:10px;font-weight:700;text-decoration:none}.skip-link:focus{top:12px}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.container{width:min(1180px,100% - 32px);margin-inline:auto}.narrow{width:min(760px,100% - 32px);margin-inline:auto}main{padding-block:28px 64px;min-height:calc(100vh - 140px)}.stack>*+*{margin-top:var(--gap, 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.lockup-tagline{font-size:clamp(.66rem,3.1vw,.8rem)}.guest-nav a{min-width:44px;min-height:44px;justify-content:center;padding:8px}.guest-nav-label{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}}.nav{display:flex;gap:4px;margin-inline-start:auto;align-items:center;flex-wrap:wrap}.nav a{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;white-space:nowrap;border-radius:10px;text-decoration:none;color:var(--ink-2);font-weight:600}.nav a:hover{background:var(--bg-soft);color:var(--ink)}.nav a[aria-current=page]{background:var(--primary-soft);color:var(--primary-strong)}.btn.menu-toggle{display:none}main:focus{outline:none}@media (max-width: 1100px){.btn.menu-toggle{display:inline-flex;margin-inline-start:auto}.nav{display:none;position:absolute;inset-inline:0;top:66px;background:var(--surface);border-bottom:1px solid var(--line);padding:10px 16px 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button[aria-selected=true]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}.bar{height:10px;background:var(--bg-soft);border-radius:999px;overflow:hidden}.bar>span{display:block;height:100%;border-radius:inherit;background:var(--bar, var(--primary));transition:width .6s var(--ease)}.stat{display:grid;gap:2px}.stat b{font-family:var(--font-head);font-size:1.8rem;line-height:1.1}.stat span{color:var(--ink-3);font-size:.9rem}.page-head{margin-bottom:24px}.page-head p{color:var(--ink-2);max-width:62ch}.eyebrow{display:inline-flex;gap:8px;align-items:center;font-weight:700;color:var(--primary);font-size:.9rem;margin-bottom:6px}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.table-wrap .chip{white-space:nowrap}table{width:100%;border-collapse:collapse}th,td{padding:12px 14px;text-align:start;border-bottom:1px solid var(--line);vertical-align:middle}th{font-family:var(--font-head);font-weight:600;font-size:.88rem;color:var(--ink-3);background:var(--surface-2);white-space:nowrap}th button{all:unset;cursor:pointer;display:inline-flex;gap:4px;align-items:center}th button:focus-visible{outline:3px solid var(--focus)}tr:last-child td{border-bottom:0}tbody tr:hover{background:var(--surface-2)}.empty{text-align:center;padding:48px 20px;color:var(--ink-3)}.empty svg{margin:0 auto 12px;color:var(--line-strong)}.spinner{width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin:40px auto}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pop{0%{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}@keyframes rise{0%{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}.rise{animation:rise .45s var(--ease) both}.dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#080c1a80;display:grid;place-items:center;z-index:90;padding:16px}.dialog{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);width:min(440px,100%);padding:24px;animation:pop .2s var(--ease);max-height:calc(100vh - 32px);overflow:auto}.a11y-fab{position:fixed;inset-inline-start:16px;bottom:16px;z-index:60;width:52px;height:52px;border-radius:50%;background:var(--primary);color:var(--primary-ink);border:0;cursor:pointer;display:grid;place-items:center;box-shadow:var(--shadow-lg)}.a11y-panel{position:fixed;inset-inline-start:16px;bottom:80px;z-index:61;width:min(340px,calc(100vw - 32px))}.switch-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}.switch-row:last-of-type{border-bottom:0}.seg{display:inline-flex;border:1px solid var(--line-strong);border-radius:10px;overflow:hidden}.seg button{border:0;background:var(--surface);padding:6px 12px;cursor:pointer;font-weight:700}.seg button+button{border-inline-start:1px solid var(--line-strong)}.seg button[aria-pressed=true]{background:var(--primary);color:var(--primary-ink)}.toggle{position:relative;width:48px;height:28px;border-radius:999px;background:var(--line-strong);border:0;cursor:pointer;flex:none;transition:background .2s}.toggle:after{content:"";position:absolute;top:3px;inset-inline-start:3px;width:22px;height:22px;border-radius:50%;background:#fff;transition:inset-inline-start .2s var(--ease);box-shadow:0 1px 3px #00000040}.toggle[aria-checked=true]{background:var(--primary)}.toggle[aria-checked=true]:after{inset-inline-start:23px}.hero{position:relative;overflow:hidden;border-radius:28px;padding:clamp(20px,6vw,64px);background:radial-gradient(1200px 400px at 110% -20%,color-mix(in srgb,var(--accent) 40%,transparent),transparent 60%),linear-gradient(135deg,#1b2f8f,#2443c2 55%,#3b5be0);color:#fff;box-shadow:var(--shadow-lg)}.hero h1{font-size:clamp(2rem,5.5vw,3.3rem);max-width:16ch}.hero p{font-size:1.15rem;max-width:46ch;color:#dfe6ff}.hero .road{position:absolute;inset-inline-end:-40px;bottom:-30px;width:min(46%,520px);opacity:.95;pointer-events:none}@media (max-width: 760px){.hero .road{opacity:.18;width:80%}}.hero .btn.secondary{background:#ffffff1f;color:#fff;border-color:#ffffff59}.hero .btn.secondary:hover{background:#fff3}.role-card{display:grid;gap:10px;align-content:start;min-height:220px}.role-card .icon-wrap{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary-strong)}.role-card h2{margin:6px 0 0}.role-card .go{margin-top:auto;font-weight:700;color:var(--primary);display:inline-flex;gap:6px;align-items:center}.feature{display:flex;gap:14px;align-items:flex-start}.feature .icon-wrap{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;flex:none;background:var(--bg-soft);color:var(--primary)}.auth-shell{display:grid;grid-template-columns:1.05fr 1fr;gap:0;border-radius:28px;overflow:hidden;box-shadow:var(--shadow-lg);background:var(--surface);border:1px solid var(--line)}.auth-side{padding:44px;color:#fff;background:linear-gradient(160deg,#1b2f8f,#2f52d8);display:grid;align-content:space-between;gap:24px}.auth-side.teacher{background:linear-gradient(160deg,#0b5f57,#12907f)}.auth-side p{color:#ffffffdb}.auth-form{padding:40px;display:grid;gap:18px;align-content:start}@media (max-width: 860px){.auth-shell{grid-template-columns:1fr}.auth-side{padding:28px}.auth-form{padding:24px}}.demo-box{border:1.5px dashed var(--line-strong);border-radius:14px;padding:14px;display:grid;gap:10px;background:var(--surface-2)}.welcome{display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:center}@media (max-width: 760px){.welcome{grid-template-columns:1fr;text-align:center;justify-items:center}}.ring{position:relative;width:var(--size, 132px);height:var(--size, 132px);flex:none}.ring svg{transform:rotate(-90deg)}.ring .ring-label{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;text-align:center;line-height:1.1}.ring .ring-label b{font-family:var(--font-head);font-size:calc(var(--size, 132px) * .24);display:block}.ring .ring-label span{font-size:.75rem;color:var(--ink-3)}.topic-card{border-top:5px solid var(--tc);display:grid;gap:12px}.topic-num{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-family:var(--font-head);font-weight:700;color:var(--on-color);background:var(--tc);flex:none}.action-tile{display:flex;gap:14px;align-items:center}.action-tile .icon-wrap{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;flex:none}.quiz-top{display:flex;align-items:center;gap:14px;margin-bottom:16px}.quiz-top .bar{flex:1}.timer{font-family:var(--font-head);font-variant-numeric:tabular-nums;font-weight:700;display:inline-flex;gap:6px;align-items:center;padding:6px 12px;border-radius:10px;background:var(--bg-soft)}.timer.low{background:var(--bad-soft);color:var(--bad)}.question-card{padding:clamp(20px,4vw,34px);animation:rise .35s var(--ease) both}.question-card .q-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.question-card .prompt{font-family:var(--font-head);font-size:clamp(1.2rem,2.6vw,1.5rem);font-weight:600;line-height:1.45;margin-bottom:20px}.q-image{margin:0 auto 22px;max-height:300px;width:auto;border-radius:14px;border:1px solid var(--line);background:#fff;object-fit:contain;cursor:zoom-in}.q-video{margin:0 auto 22px;max-width:640px}.q-video iframe{display:block;width:100%;aspect-ratio:16 / 9;border:0;border-radius:14px;background:#000}.q-video p{margin:8px 0 0;text-align:center}.q-image.sign{max-height:200px;padding:12px}.options{display:grid;gap:12px;list-style:none;padding:0;margin:0}.options.with-images{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.option{width:100%;display:flex;align-items:center;gap:14px;padding:14px 16px;min-height:64px;text-align:start;background:var(--surface);border:2px solid var(--line);border-radius:14px;cursor:pointer;font-size:1.03rem;line-height:1.5;transition:border-color .15s,background .15s,transform .1s}.option:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}.option:disabled{cursor:default}.option .key{width:34px;height:34px;border-radius:10px;flex:none;display:grid;place-items:center;font-family:var(--font-head);font-weight:700;background:var(--bg-soft);color:var(--ink-2)}.option.image-option{flex-direction:column;text-align:center;justify-content:center}.option.image-option img{height:110px;width:auto;object-fit:contain}.option[aria-pressed=true]{border-color:var(--primary);background:var(--primary-soft)}.option[aria-pressed=true] .key{background:var(--primary);color:var(--primary-ink)}.option.correct{border-color:var(--ok);background:var(--ok-soft)}.option.correct .key{background:var(--ok);color:var(--on-color)}.option.wrong{border-color:var(--bad);background:var(--bad-soft)}.option.wrong .key{background:var(--bad);color:var(--on-color)}.option.dim{opacity:.6}.option .verdict{margin-inline-start:auto;flex:none}.feedback{margin-top:18px;padding:16px 18px;border-radius:14px;display:flex;gap:12px;align-items:flex-start;animation:pop .25s var(--ease)}.feedback.ok{background:var(--ok-soft);color:var(--ok)}.feedback.bad{background:var(--bad-soft);color:var(--bad)}.feedback b{display:block;font-family:var(--font-head);font-size:1.1rem}.feedback p{margin:2px 0 0;color:var(--ink)}.quiz-actions{display:flex;justify-content:space-between;gap:12px;margin-top:20px;flex-wrap:wrap}.kbd-hint{font-size:.82rem;color:var(--ink-3)}kbd{font-family:inherit;font-size:.8em;padding:1px 6px;border:1px solid var(--line-strong);border-bottom-width:2px;border-radius:6px;background:var(--surface)}.qnav{display:flex;flex-wrap:wrap;gap:6px}.qnav button{width:38px;height:38px;border-radius:10px;border:1.5px solid var(--line);background:var(--surface);cursor:pointer;font-weight:700;font-variant-numeric:tabular-nums}.qnav button.answered{background:var(--primary-soft);border-color:var(--primary);color:var(--primary-strong)}.qnav button[aria-current=true]{outline:3px solid var(--accent);outline-offset:1px}.qnav button.ok{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}.qnav button.bad{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}.result-hero{text-align:center;padding:40px 20px}.result-hero 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