@import"https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400&family=Overpass:wght@600;700;800&family=Overpass+Mono:wght@500;600&display=swap";:root{--bg: #eef1f3;--surface: #ffffff;--surface-2: #f6f8f9;--ink: #14212b;--muted: #586873;--line: #d5dde2;--line-strong: #b4c0c7;--accent: #1f5fae;--accent-ink: #174a8a;--accent-soft: #e3edf9;--on-accent: #ffffff;--marker: #f2b705;--marker-soft: #fff4cc;--marker-ink: #5a4300;--good: #1f8a5b;--good-soft: #e2f4ea;--bad: #c8323c;--bad-soft: #fbe6e7;--warn: #9a6a0f;--warn-soft: #fbf0d9;--scene-grass: #d4e5c8;--scene-road: #4d565b;--scene-kerb: #c3cbcf;--scene-line: #f6f8f9;--scene-tree: #6ea25c;--scene-tree-dark: #4d7f3f;--scene-building: #a9b4bb;--scene-pole: #6d7a81;--shadow: 0 1px 2px rgba(20, 33, 43, .06), 0 6px 20px rgba(20, 33, 43, .06);--font-display: "Overpass", "Segoe UI", system-ui, sans-serif;--font-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, sans-serif;--font-mono: "Overpass Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--r: 12px;--r-sm: 8px}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #0e161c;--surface: #16212a;--surface-2: #1b2832;--ink: #e6edf1;--muted: #98a9b3;--line: #2a3943;--line-strong: #3a4c58;--accent: #6fa8ff;--accent-ink: #9cc3ff;--accent-soft: #1a2f4b;--on-accent: #0b1520;--marker: #f5c542;--marker-soft: #3a3010;--marker-ink: #ffe59a;--good: #46c08a;--good-soft: #143528;--bad: #ff7b84;--bad-soft: #3d1a1e;--warn: #f0b555;--warn-soft: #3a2c12;--scene-grass: #314a34;--scene-road: #3b4448;--scene-kerb: #6a767c;--scene-line: #e8edef;--scene-tree: #4f7f45;--scene-tree-dark: #3a6233;--scene-building: #5d6a72;--scene-pole: #8a979e;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);color-scheme:dark}}:root[data-theme=dark]{--bg: #0e161c;--surface: #16212a;--surface-2: #1b2832;--ink: #e6edf1;--muted: #98a9b3;--line: #2a3943;--line-strong: #3a4c58;--accent: #6fa8ff;--accent-ink: #9cc3ff;--accent-soft: #1a2f4b;--on-accent: #0b1520;--marker: #f5c542;--marker-soft: #3a3010;--marker-ink: #ffe59a;--good: #46c08a;--good-soft: #143528;--bad: #ff7b84;--bad-soft: #3d1a1e;--warn: #f0b555;--warn-soft: #3a2c12;--scene-grass: #314a34;--scene-road: #3b4448;--scene-kerb: #6a767c;--scene-line: #e8edef;--scene-tree: #4f7f45;--scene-tree-dark: #3a6233;--scene-building: #5d6a72;--scene-pole: #8a979e;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);color-scheme:dark}*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:var(--font-display);line-height:1.15;margin:0 0 .5em;text-wrap:balance;letter-spacing:-.01em}h1{font-size:clamp(1.6rem,1.2rem + 1.8vw,2.3rem);font-weight:800}h2{font-size:1.3rem;font-weight:700}h3{font-size:1.05rem;font-weight:700}p{margin:0 0 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button.on{background:var(--ink);color:var(--surface)}.save-dot{width:9px;height:9px;border-radius:50%;background:var(--line-strong)}.save-dot.save-saving{background:var(--marker)}.save-dot.save-saved{background:var(--good)}.save-dot.save-error{background:var(--bad)}.icon-btn{display:inline-grid;place-items:center;min-width:38px;min-height:38px;border-radius:8px;border:1px solid transparent;background:transparent;color:var(--ink);cursor:pointer;text-decoration:none}.icon-btn:hover:not(:disabled){background:var(--surface-2);border-color:var(--line)}.icon-btn:disabled{opacity:.35;cursor:default}.main{max-width:1180px;margin:0 auto;padding-block:24px 40px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}.tabbar{display:none}.banner{max-width:1180px;margin:12px auto 0;padding:10px 14px;border-radius:var(--r-sm);background:var(--surface-2);border:1px solid 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";color:var(--muted)}.bi-inline>.bi-en{opacity:.8}.bi-columns{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}.bi-columns>.bi-cs,.bi-columns>.bi-en{display:block;min-width:0}.bi-columns>.bi-en{border-left:2px solid var(--line);padding-left:16px;color:color-mix(in srgb,var(--ink) 82%,var(--muted))}h1.bi-stack .bi-en,h2.bi-stack .bi-en{font-weight:600;font-size:.62em;margin-top:.25em}h2.bi-columns,h1.bi-columns{font-size:1.2rem}.u-both .u-sep{color:var(--muted)}.u-both [lang=en]{color:inherit;opacity:.78}.btn .u-both,.nav-link .u-both,.tab .u-both{display:inline-flex;flex-direction:column;line-height:1.12}.btn .u-both .u-sep,.nav-link .u-both .u-sep,.tab .u-both .u-sep{display:none}.btn .u-both [lang=en],.nav-link .u-both [lang=en],.tab .u-both [lang=en]{font-size:.76em;font-weight:600}.missing{display:inline}.missing-flag{display:inline-block;font-family:var(--font-mono);font-size:.72rem;padding:1px 6px;border-radius:4px;background:var(--warn-soft);color:var(--warn);border:1px dashed var(--warn)}.missing-other{color:var(--muted);font-style:italic}.origin{display:inline-block;margin-left:6px;font-family:var(--font-mono);font-size:.64rem;font-weight:600;padding:0 5px;border-radius:4px;background:var(--accent-soft);color:var(--accent-ink);vertical-align:2px;font-style:normal}.md{display:block}.md-p{display:block;margin-bottom:.55em}.md ol,.md ul{margin:.3em 0 .6em;padding-left:1.3em}.md li{margin:.15em 0}.home{display:grid;gap:28px;max-width:920px;margin:0 auto}.hero-card{background:var(--surface);border-radius:18px;padding:clamp(20px,4vw,36px);box-shadow:var(--shadow);position:relative;overflow:hidden}.hero-card:after{content:"";position:absolute;right:30px;top:0;bottom:0;width:8px;border-radius:2px;background:repeating-linear-gradient(180deg,transparent 0 18px,var(--marker) 18px 46px)}.hero-card h1{padding-right:60px}.hero-card.done{text-align:center}.strip-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}.strip-head h2{margin:0}.strip-head .btn{margin-left:auto}.strip{list-style:none;margin:0;padding:18px 0 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;position:relative}.strip:before{content:"";position:absolute;left:0;right:0;top:34px;height:10px;background:var(--scene-road);border-radius:6px;background-image:repeating-linear-gradient(90deg,transparent 0 14px,var(--scene-line) 14px 28px);background-size:100% 2px;background-repeat:repeat-x;background-position:0 4px}.strip-node a{display:grid;gap:10px;justify-items:start;text-decoration:none;color:var(--ink);position:relative}.strip-title{font-size:.9rem;line-height:1.3}.km{display:inline-grid;place-items:center;min-width:34px;height:34px;padding:0 6px;border-radius:6px;background:var(--surface);border:2px solid var(--ink);font-family:var(--font-mono);font-weight:600;font-size:.85rem;color:var(--ink);position:relative;z-index:1}.is-done .km{background:var(--good);border-color:var(--good);color:var(--surface)}.is-current .km{background:var(--marker);border-color:var(--marker-ink);color:#2b2100;box-shadow:0 0 0 4px color-mix(in srgb,var(--marker) 35%,transparent)}.next-actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}.action-card{display:flex;align-items:center;gap:14px;text-align:left;padding:16px;border-radius:var(--r);border:1px solid var(--line);background:var(--surface);cursor:pointer;color:var(--ink)}.action-card:hover{border-color:var(--accent)}.action-card>span{display:grid;gap:2px}.action-card .icon{color:var(--accent);flex-shrink:0}.course-map{max-width:860px;margin:0 auto}.page-head{margin-bottom:20px}.module{margin-bottom:30px}.module-title{font-size:1.45rem;padding-bottom:8px;border-bottom:3px solid var(--ink)}.topic-title{color:var(--muted);font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;margin:18px 0 8px}.road{list-style:none;margin:0;padding:0 0 0 56px;position:relative}.road:before{content:"";position:absolute;left:14px;top:0;bottom:0;width:28px;background:var(--scene-road);border-radius:4px;background-image:linear-gradient(var(--scene-line) 50%,transparent 50%);background-size:3px 24px;background-repeat:repeat-y;background-position:center}.road-node{position:relative;padding:8px 0}.road-node .km{position:absolute;left:-56px;top:16px;margin-left:11px}.road-card{display:grid;gap:6px;padding:14px 16px;border-radius:var(--r);background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--ink)}.road-card:hover{border-color:var(--accent)}.road-node.is-current .road-card{border:2px solid var(--marker);box-shadow:var(--shadow)}.road-node.is-checkpoint .road-card{background:var(--surface-2);border-style:dashed}.road-card-head{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.lesson{max-width:960px;margin:0 auto}.lesson-top{margin-bottom:18px}.steps{list-style:none;display:flex;gap:4px;padding:0;margin:8px 0 0}.steps li{flex:1}.steps button{width:100%;height:8px;border-radius:4px;border:0;background:var(--line);cursor:pointer;padding:0}.steps .is-done button{background:var(--good)}.steps .is-current button{background:var(--marker);height:12px;margin-top:-2px}.steps .k-question button,.steps .k-knowledge_check button,.steps .k-recap button{border-radius:50px}.lesson-intro,.lesson-block,.complete-card{background:var(--surface);border-radius:18px;padding:clamp(18px,3.5vw,34px);box-shadow:var(--shadow)}.objectives{padding-left:1.2em}.lesson-nav{display:flex;justify-content:space-between;gap:10px;margin-top:16px;position:sticky;bottom:calc(env(safe-area-inset-bottom,0px) + 8px);background:var(--bg);box-shadow:0 -10px 16px -12px #14212b40;padding:8px;border-radius:14px;z-index:5}.lesson-nav .btn.primary{margin-left:auto}.text-block.style-rule{border-left:6px solid var(--accent);padding-left:18px}.text-block.style-tip,.text-block.style-example{border-left:6px solid var(--marker);padding-left:18px}.text-block.style-warning{border-left:6px solid var(--bad);padding-left:18px}.prose{font-size:1.06rem}.block-media{margin:18px 0 0}.block-media img,.block-media video{border-radius:var(--r-sm);display:block;width:100%;height:auto}.block-media figcaption{color:var(--muted);font-size:.9rem;margin-top:6px}.summary-list{list-style:none;padding:0;display:grid;gap:10px}.summary-list li{display:grid;grid-template-columns:24px 1fr;gap:10px;align-items:start;padding:10px 12px;background:var(--surface-2);border-radius:var(--r-sm)}.summary-list .icon{color:var(--good);margin-top:3px}.complete-card{text-align:center;max-width:720px;margin:0 auto}.complete-card .concept-chips,.complete-card .hero-actions{justify-content:center}.complete-mark{display:inline-grid;place-items:center;width:72px;height:72px;border-radius:50%;background:var(--good);color:var(--surface);margin-bottom:12px}.big-score{font-family:var(--font-display);font-size:3rem;font-weight:800;margin:0;font-variant-numeric:tabular-nums}.seq-title{margin-bottom:4px}.from-chip{display:inline-flex;align-items:center;gap:6px;font-size:.82rem;color:var(--accent-ink);background:var(--accent-soft);padding:3px 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var(--line);background:var(--surface);cursor:pointer;color:var(--ink);min-height:54px}.option:hover:not(:disabled){border-color:var(--accent)}.option:disabled{cursor:default}.option.is-chosen,.option[aria-checked=true]{border-color:var(--accent);background:var(--accent-soft)}.option.is-correct{border-color:var(--good);background:var(--good-soft)}.option.is-wrong{border-color:var(--bad);background:var(--bad-soft)}.option.is-missed{border-style:dashed;border-color:var(--good)}.option .icon{margin-left:auto;color:var(--good);flex-shrink:0}.opt-key{display:inline-grid;place-items:center;min-width:30px;height:30px;border-radius:6px;border:2px solid currentColor;font-family:var(--font-mono);font-weight:600;font-size:.85rem;color:var(--muted);flex-shrink:0}.opt-box{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:6px;border:2px solid var(--line-strong);flex-shrink:0}.option[aria-checked=true] 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