/* Built by scripts/build-css.mjs from public/css/app.css: that file is the one to edit. */
@layer properties, legacy, theme, base, components, utilities;
@layer legacy{:root{--signal:#61fac4;--azure:#4fc2ff;--violet:#9c7aff;--coral:#ff736b;--amber:#ffb84a;--t-signal:#61fac4;--t-azure:#4fc2ff;--t-violet:#9c7aff;--t-coral:#ff736b;--t-amber:#ffb84a;--canvas:#05060d;--canvas-raised:#090c16;--surface:#0e121d;--surface-elevated:#131826;--glass:rgba(19,24,38,0.62);--glass-strong:rgba(19,24,38,0.86);--text-1:#f2f7ff;--text-2:#a2afc7;--text-3:#728098;--text-4:#48536a;--stroke:rgba(255,255,255,0.105);--stroke-strong:rgba(255,255,255,0.19);--stroke-hi:rgba(255,255,255,0.18);--divider:rgba(255,255,255,0.075);--subtle-fill:rgba(255,255,255,0.055);--input-fill:rgba(0,0,0,0.22);--rail-fill:rgba(0,0,0,0.10);--shadow:rgba(0,0,0,0.52);--grid-line:rgba(255,255,255,0.035);--grid-major:rgba(255,255,255,0.065);--on-signal:#03140e;--code-bg:rgba(0,0,0,0.30);--code-ink:#dfe7f5;--hl-keyword:#b59cff;--hl-string:#7ee8b8;--hl-number:#ffb84a;--hl-comment:#7d8aa3;--hl-builtin:#4fc2ff;--hl-def:#ff9b8f;--marker:rgba(255,184,74,0.16);--marker-strong:#ffb84a;--grad-signal:linear-gradient(135deg,#61fac4,#4fc2ff);--grad-spectral:linear-gradient(90deg,#61fac4,#4fc2ff,#9c7aff);--grad-active:linear-gradient(90deg,#f0742c,#f5933f);--font-ui:ui-rounded,"SF Pro Rounded",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,sans-serif;--font-mono:ui-monospace,"SF Mono",SFMono-Regular,"JetBrains Mono",Menlo,Consolas,monospace;--r-sm:10px;--r-md:16px;--r-lg:24px;--r-pill:999px;--ease-out:cubic-bezier(0.23,1,0.32,1);--sidebar-w:248px;--topbar-h:0px;--ink:var(--text-1);--ink-2:var(--text-2);--ink-3:var(--text-3);--ink-4:var(--text-4);--paper-sunk:var(--subtle-fill);--rule-strong:var(--stroke-strong);--font-read:var(--font-ui);--signal-soft:rgba(97,250,196,0.10);--signal-line:rgba(97,250,196,0.38);--redpen:var(--t-coral);--redpen-soft:rgba(255,115,107,0.10);color-scheme:dark}:root[data-theme="light"]{--t-signal:#006e4f;--t-azure:#0063ab;--t-violet:#573bb8;--t-coral:#b82626;--t-amber:#8a4f00;--canvas:#f4f7fc;--canvas-raised:#ffffff;--surface:#fbfcff;--surface-elevated:#ffffff;--glass:rgba(255,255,255,0.72);--glass-strong:rgba(255,255,255,0.92);--text-1:#0e121d;--text-2:#4f5c74;--text-3:#667081;--text-4:#a7b0bf;--stroke:rgba(20,31,54,0.105);--stroke-strong:rgba(20,31,54,0.19);--stroke-hi:rgba(75,0,130,0.11);--divider:rgba(20,31,54,0.10);--subtle-fill:rgba(20,31,54,0.055);--input-fill:rgba(255,255,255,0.88);--rail-fill:rgba(255,255,255,0.36);--shadow:rgba(75,0,130,0.13);--grid-line:rgba(75,0,130,0.035);--grid-major:rgba(75,0,130,0.06);--code-bg:rgba(20,31,54,0.05);--code-ink:#1b2233;--hl-keyword:#6a3fc4;--hl-string:#00744f;--hl-number:#9a5a00;--hl-comment:#5d6878;--hl-builtin:#0063ab;--hl-def:#b0352b;--marker:rgba(255,184,74,0.24);--marker-strong:#b36b00;--signal-soft:rgba(0,150,105,0.09);--signal-line:rgba(0,130,95,0.35);--redpen-soft:rgba(184,38,38,0.07);color-scheme:light}.acc-signal{--acc:var(--signal);--acc-text:var(--t-signal)}.acc-azure{--acc:var(--azure);--acc-text:var(--t-azure)}.acc-violet{--acc:var(--violet);--acc-text:var(--t-violet)}.acc-coral{--acc:var(--coral);--acc-text:var(--t-coral)}.acc-amber{--acc:var(--amber);--acc-text:var(--t-amber)}*,*::before,*::after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;min-height:100vh;background:var(--canvas);color:var(--text-1);font:400 15px/1.5 var(--font-ui);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}body::before,body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:0}body::before{background:radial-gradient(60vw 60vw at 92% -12%,rgba(156,122,255,0.16),rgba(156,122,255,0.05) 40%,transparent 70%),radial-gradient(52vw 52vw at -8% 108%,rgba(79,194,255,0.13),rgba(79,194,255,0.04) 40%,transparent 70%)}body::after{background-image:linear-gradient(var(--grid-major) 0.75px,transparent 0.75px),linear-gradient(90deg,var(--grid-major) 0.75px,transparent 0.75px),linear-gradient(var(--grid-line) 0.5px,transparent 0.5px),linear-gradient(90deg,var(--grid-line) 0.5px,transparent 0.5px);background-size:128px 128px,128px 128px,32px 32px,32px 32px;-webkit-mask-image:linear-gradient(180deg,transparent,rgba(0,0,0,0.9) 35%,rgba(0,0,0,0.9) 65%,transparent);mask-image:linear-gradient(180deg,transparent,rgba(0,0,0,0.9) 35%,rgba(0,0,0,0.9) 65%,transparent)}:root[data-theme="light"] body::before{background:radial-gradient(60vw 60vw at 92% -12%,rgba(156,122,255,0.12),transparent 65%),radial-gradient(52vw 52vw at -8% 108%,rgba(79,194,255,0.12),transparent 65%)}h1,h2,h3,h4{margin:0;font-weight:700;text-wrap:balance}p{margin:0;text-wrap:pretty}a{color:inherit}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}:focus-visible{outline:2px solid var(--t-azure);outline-offset:2px;border-radius:6px}.mono{font-family:var(--font-mono)}.muted{color:var(--text-3)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}[hidden]{display:none !important}.eyebrow{font:700 12px/1.3 var(--font-mono);letter-spacing:0.14em;text-transform:uppercase;color:var(--acc-text,var(--t-signal));display:inline-flex;align-items:center;gap:8px}.eyebrow.dot::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor}.eyebrow.quiet{color:var(--text-3)}.glass{background:linear-gradient(var(--glass),var(--glass)) padding-box,linear-gradient(135deg,var(--stroke-hi),var(--stroke)) border-box;border:1px solid transparent;border-radius:var(--r-lg);-webkit-backdrop-filter:blur(18px) saturate(1.3);backdrop-filter:blur(18px) saturate(1.3)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 18px;border:1px solid var(--stroke-strong);border-radius:var(--r-pill);background:var(--subtle-fill);color:var(--text-1);font-weight:600;font-size:14.5px;white-space:nowrap;text-decoration:none;transition:background-color 140ms var(--ease-out),border-color 140ms var(--ease-out),transform 100ms var(--ease-out),box-shadow 160ms var(--ease-out)}.btn:hover{background:rgba(255,255,255,0.09);border-color:var(--stroke-hi)}.btn:active{transform:scale(0.97)}.btn:disabled{opacity:0.45;cursor:default;transform:none}.btn.primary{background:var(--grad-signal);border-color:transparent;color:var(--on-signal);box-shadow:0 0 0 1px rgba(97,250,196,0.25),0 6px 22px rgba(97,250,196,0.18)}.btn.primary:hover{filter:brightness(1.06);box-shadow:0 0 0 1px rgba(97,250,196,0.35),0 8px 28px rgba(97,250,196,0.26)}.btn.quiet{border-color:transparent;background:transparent;color:var(--text-2)}.btn.quiet:hover{background:var(--subtle-fill);color:var(--text-1)}.btn.small{height:32px;padding:0 13px;font-size:13px}.btn.large{height:48px;padding:0 24px;font-size:16px}.btn kbd{font-family:var(--font-mono);font-size:11px;opacity:0.7}.linkish{background:none;border:0;padding:0;color:var(--t-signal);font-weight:600;text-decoration:none}.linkish:hover{text-decoration:underline;text-underline-offset:3px}.chip{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 12px;border-radius:var(--r-pill);background:var(--subtle-fill);border:1px solid var(--stroke);color:var(--text-2);font-size:13px;font-weight:600;white-space:nowrap}.badge{min-width:20px;height:20px;padding:0 6px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;background:var(--grad-signal);color:var(--on-signal);font-size:11.5px;font-weight:700;font-variant-numeric:tabular-nums}.icon-btn{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--stroke);background:var(--subtle-fill);border-radius:50%;color:var(--text-2)}.icon-btn:hover{color:var(--text-1);border-color:var(--stroke-strong)}.icon-btn svg{width:18px;height:18px}.app{position:relative;z-index:1;display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;z-index:20;display:flex;flex-direction:column;gap:22px;padding:22px 14px 16px;background:color-mix(in srgb,var(--canvas-raised) 82%,transparent);border-right:1px solid var(--divider);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:12px;padding:0 8px;text-decoration:none}.brand .tile{width:40px;height:40px;border-radius:12px;flex:none;display:grid;place-items:center;color:var(--text-1)}.brand .tile svg{width:36px;height:36px}.brand .name{font:700 14.5px/1.1 var(--font-mono);letter-spacing:0.06em;color:var(--text-1)}.brand .tag{font:600 9.5px/1.4 var(--font-mono);letter-spacing:0.16em;color:var(--text-3);margin-top:3px}.nav{display:grid;gap:4px}.nav a{display:flex;align-items:center;gap:12px;height:46px;padding:0 14px;border-radius:12px;text-decoration:none;color:var(--text-1);font-weight:600;font-size:16px;transition:background-color 140ms var(--ease-out)}.nav a svg{width:20px;height:20px;flex:none}.nav a:hover{background:var(--subtle-fill)}.nav a[aria-current="page"]{background:var(--grad-active);color:#fff;box-shadow:0 6px 20px rgba(240,116,44,0.28)}.nav a .badge{margin-left:auto}.nav a[aria-current="page"] .badge{background:rgba(255,255,255,0.92);color:#a2430d}.sidebar .spacer{flex:1}.meter{height:6px;border-radius:3px;background:var(--subtle-fill);overflow:hidden}.meter span{display:block;height:100%;border-radius:3px;background:linear-gradient(90deg,var(--signal),#4fe0d8);box-shadow:0 0 10px rgba(97,250,196,0.45)}.content{min-width:0;position:relative}.page{max-width:1180px;margin:0 auto;padding:44px 40px 96px}.loading{padding:80px 24px;text-align:center;color:var(--text-3)}.loss-chart{display:block;width:100%;height:130px}.loss-chart .grid{stroke:var(--grid-major)}.loss-chart .curve{fill:none;stroke-width:2.25;stroke-linejoin:round;stroke-linecap:round;filter:drop-shadow(0 0 6px rgba(97,250,196,0.45))}.loss-chart .dot{fill:var(--signal);filter:drop-shadow(0 0 6px rgba(97,250,196,0.8))}.loss-chart text{font:10px var(--font-mono);fill:var(--text-3)}.activity{display:grid;grid-template-columns:minmax(0,auto) minmax(220px,1fr);gap:28px;align-items:start}.activity-grid{display:grid;grid-template-rows:repeat(7,14px);grid-template-columns:28px;grid-auto-columns:14px;gap:4px;overflow-x:auto}.activity-grid .dl{font:600 9.5px var(--font-mono);color:var(--text-3);line-height:14px}.activity i{display:block;width:14px;height:14px;border-radius:4px;background:var(--subtle-fill);border:1px solid var(--divider)}.activity i.future{background:transparent;border-style:dashed;opacity:0.5}.activity i.today{outline:1.5px solid var(--t-amber);outline-offset:1px}.level{font:700 11px var(--font-mono);letter-spacing:0.12em;text-transform:uppercase;color:var(--text-2);display:inline-flex;align-items:center;gap:6px}.level::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--acc)}.queue{display:grid;gap:10px}.legend{display:flex;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-2);padding-bottom:6px}.legend span{display:inline-flex;align-items:center;gap:7px}.legend i{width:12px;height:12px;border-radius:4px;display:inline-block}.phase-band{position:absolute;top:0;bottom:0;border-right:1px dashed var(--divider)}.phase-band header{position:sticky;top:0;padding:16px 18px 12px;z-index:2;background:linear-gradient(180deg,var(--canvas) 70%,transparent)}.phase-band header .n{font:700 11px var(--font-mono);letter-spacing:0.14em;text-transform:uppercase;color:var(--acc-text)}.phase-band header .t{font-weight:800;font-size:17px;letter-spacing:-0.2px;margin-top:2px}.phase-band header .c{font-size:12.5px;color:var(--text-3);font-variant-numeric:tabular-nums}.node{position:absolute;width:168px;min-height:44px;display:flex;align-items:center;gap:9px;padding:7px 11px;border-radius:12px;border:1px solid var(--stroke-strong);background:var(--glass-strong);font-size:12.5px;font-weight:600;line-height:1.3;text-align:left;color:var(--text-2);transition:border-color 140ms var(--ease-out),background-color 140ms var(--ease-out),box-shadow 140ms var(--ease-out)}.node:hover{border-color:var(--text-3);color:var(--text-1)}.node .dot{flex:none;width:10px;height:10px;border-radius:50%;border:1.5px solid var(--text-4)}.node.locked{color:var(--text-3);border-style:dashed;border-color:var(--stroke-strong);background:color-mix(in srgb,var(--glass) 70%,transparent)}.node.available{color:var(--text-1);border-color:rgba(97,250,196,0.45)}.node.available .dot{border-color:var(--signal)}.node.learning{color:var(--text-1);border-color:rgba(79,194,255,0.5)}.node.learning .dot{border-color:var(--azure);background:linear-gradient(90deg,var(--azure) 50%,transparent 50%)}.node.known{color:var(--text-1);background:color-mix(in srgb,var(--signal) 10%,var(--glass-strong));border-color:rgba(97,250,196,0.45)}.node.known .dot{background:var(--signal);border-color:var(--signal);box-shadow:0 0 8px rgba(97,250,196,0.7)}.node.tested .dot{background:repeating-linear-gradient(45deg,var(--signal) 0 2px,transparent 2px 4px)}.node.selected{box-shadow:0 0 0 2px var(--azure),0 0 22px rgba(79,194,255,0.3)}.node.next{box-shadow:0 0 0 2px var(--amber),0 0 22px rgba(255,184,74,0.28)}.drawer{width:380px;border-left:1px solid var(--divider);background:color-mix(in srgb,var(--canvas-raised) 90%,transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);overflow-y:auto;padding:24px;display:grid;gap:16px;align-content:start}.drawer h2{font-size:26px;line-height:1.15;letter-spacing:-0.35px}.drawer .summary{font-size:16px;color:var(--text-2);line-height:1.5}.drawer .rel h3{font:700 11px var(--font-mono);letter-spacing:0.14em;text-transform:uppercase;color:var(--text-3);margin-bottom:8px}.drawer .rel ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}.drawer .rel button{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:1px solid transparent;background:transparent;padding:7px 10px;border-radius:10px;color:var(--text-2);font-weight:600}.drawer .rel button:hover{background:var(--subtle-fill);border-color:var(--stroke);color:var(--text-1)}.drawer .actions{display:flex;flex-wrap:wrap;gap:8px}.narrow{max-width:760px;margin:0 auto;padding:56px 32px 96px}.narrow>h1{margin-top:10px;font-size:40px;line-height:1.1;letter-spacing:-0.8px}.lede{margin-top:14px;font-size:18px;line-height:1.55;color:var(--text-2)}.ratings{margin-top:32px;display:grid;gap:10px}.seg{display:inline-flex;gap:4px;padding:4px;border-radius:var(--r-pill);background:var(--rail-fill);border:1px solid var(--stroke)}.seg button{border:0;background:transparent;padding:0 12px;height:32px;border-radius:var(--r-pill);font-size:13px;font-weight:600;color:var(--text-2)}.seg button:hover{color:var(--text-1);background:var(--subtle-fill)}.seg button[aria-pressed="true"]{background:var(--grad-signal);color:var(--on-signal)}.question{display:grid;gap:18px}.question .qmeta{display:flex;justify-content:space-between;color:var(--text-3);font:600 12px var(--font-mono);letter-spacing:0.08em;text-transform:uppercase}.question .qtext{font-size:22px;font-weight:700;line-height:1.35;letter-spacing:-0.2px}.question .qtext code,.option code{font-family:var(--font-mono);font-size:0.86em;background:var(--code-bg);padding:0.1em 0.35em;border-radius:6px}.options{display:grid;gap:10px}.option{display:grid;grid-template-columns:30px 1fr;gap:12px;align-items:start;text-align:left;padding:14px 16px;border-radius:var(--r-md);border:1px solid var(--stroke-strong);background:var(--glass);font-size:15.5px;line-height:1.45;transition:border-color 140ms var(--ease-out),background-color 140ms var(--ease-out)}.option:hover:not(:disabled){border-color:var(--t-azure)}.option .k{font:700 12px var(--font-mono);color:var(--text-2);width:26px;height:26px;border:1px solid var(--stroke-strong);border-radius:8px;display:inline-flex;align-items:center;justify-content:center}.option.right{border-color:var(--signal);background:var(--signal-soft)}.option.right .k{background:var(--signal);color:var(--on-signal);border-color:var(--signal)}.option.wrong{border-color:var(--coral);background:var(--redpen-soft)}.option.wrong .k{background:var(--coral);color:#210403;border-color:var(--coral)}.option:disabled{cursor:default}.lesson-shell{display:grid;grid-template-columns:minmax(0,1fr) 400px;min-height:100vh}.lesson-shell.tutor-closed{grid-template-columns:minmax(0,1fr) 0}.stages{margin-top:26px;display:inline-flex;gap:4px;padding:4px;border-radius:var(--r-pill);background:var(--rail-fill);border:1px solid var(--stroke)}.lesson-notes{max-width:800px;margin:0 auto;padding:0 36px 22px}.notes{border-radius:var(--r-md);padding:0}.notes summary{cursor:pointer;padding:14px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;font-weight:700;list-style:none}.notes summary::-webkit-details-marker{display:none}.notes summary::before{content:"＋";color:var(--text-3);font-weight:600;margin-right:8px}.notes[open] summary::before{content:"－"}.notes summary>span:first-child{margin-right:auto}.notes-status{font:600 11.5px var(--font-mono);color:var(--text-3)}.notes-input{display:block;width:calc(100% - 36px);margin:0 18px;min-height:110px;resize:vertical;padding:12px 14px;border-radius:12px;border:1px solid var(--stroke);background:var(--code-bg);color:var(--text-1);font-family:inherit;font-size:15px;line-height:1.55}.notes-input:focus{outline:none;border-color:var(--t-azure)}.notes-hint{margin:8px 18px 14px;font-size:12.5px;color:var(--text-3)}.why{padding:20px 22px;margin-bottom:26px;border-radius:var(--r-md);position:relative;overflow:hidden}.why::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(97,250,196,0.09),transparent 60%);pointer-events:none}.why>*{position:relative}.why .eyebrow{margin-bottom:8px}.why .prose p{font-size:16.5px;color:var(--text-1)}.prose{font-size:17px;line-height:1.68;color:var(--text-1)}.prose>* + *{margin-top:1em}.prose h2{font-size:24px;line-height:1.25;letter-spacing:-0.35px;margin-top:1.9em}.prose h3{font-size:18px;margin-top:1.5em}.prose h2 + *,.prose h3 + *{margin-top:0.6em}.prose p,.prose li{color:color-mix(in srgb,var(--text-1) 88%,var(--text-2))}.prose strong{color:var(--text-1);font-weight:700}.prose ul,.prose 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p:last-child{margin:0;display:flex;flex-wrap:wrap;justify-content:center;gap:10px}}