:root{--font-mono:"MonoLisa", "Geist Mono", "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;--bg:#f5f5f5;--bg-elevated:#fff;--surface:#ececec;--surface-hover:#e1e2ea;--fg:#1f1f1f;--fg-muted:#635d97;--fg-subtle:#8c87b8;--border:#d3d4dc;--border-strong:#b8b9c5;--hl:#644ac9;--hl-soft:#e8e3fa;--ok:#14710a;--warn:#a34d14;--bad:#cb3a2a;--info:#036a96;--code-bg:#ececec;--code-fg:#1f1f1f;--code-kw:#a3144d;--code-fn:#14710a;--code-str:#846e15;--code-com:#635d97;--code-num:#644ac9;--code-cls:#036a96;--code-var:#1f1f1f;--shadow-card:0 1px 3px #00000012, 0 6px 18px #0000000d;--shadow-pop:0 8px 28px #00000029}:root[data-theme=dark]{--bg:#0b0d0f;--bg-elevated:#161a1d;--surface:#111417;--surface-hover:#1e252b;--fg:#f8f8f2;--fg-muted:#708ca9;--fg-subtle:#4a5f70;--border:#232c33;--border-strong:#414d58;--hl:#9580ff;--hl-soft:#1e1a2e;--ok:#8aff80;--warn:#ffca80;--bad:#f55;--info:#80ffea;--code-bg:#111417;--code-fg:#f8f8f2;--code-kw:#9580ff;--code-fn:#8aff80;--code-str:#ffca80;--code-com:#708ca9;--code-num:#80ffea;--code-cls:#80ffea;--code-var:#f8f8f2;--shadow-card:inset 0 1px 0 #ffffff14, 0 8px 24px #0006;--shadow-pop:0 10px 32px #0009}*{box-sizing:border-box}html,body{height:100%}body{font-family:var(--font-mono);background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased;margin:0;font-size:15px;line-height:1.6;transition:background .2s,color .2s}#app{height:100%}::selection{background:var(--hl);color:var(--bg)}h1,h2,h3{letter-spacing:-.02em;margin:0;line-height:1.25}a{color:var(--hl);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;font-size:inherit;cursor:pointer}code,pre{font-family:var(--font-mono)}.muted{color:var(--fg-muted)}.small{font-size:.82rem}mark{background:var(--hl-soft);color:var(--hl);border-radius:.3em;padding:.05em .3em;font-weight:600}strong{color:var(--fg);font-weight:700}em{color:var(--fg-muted)}kbd{border:1px solid var(--border-strong);background:var(--bg-elevated);border-bottom-width:2px;border-radius:.35em;padding:0 .4em;font-size:.82em}t{border-bottom:1.5px dashed var(--hl);cursor:help;border-radius:.2em;padding:0 .1em;transition:background .15s,color .15s}t:hover,t.active{background:var(--hl-soft);color:var(--hl)}#tooltip-layer{pointer-events:none;z-index:1000;position:fixed;inset:0}.tooltip{background:var(--bg-elevated);border:1px solid var(--border-strong);border-left:3px solid var(--hl);max-width:340px;color:var(--fg);box-shadow:var(--shadow-pop);opacity:0;border-radius:.55rem;padding:.6rem .8rem;font-size:.82rem;line-height:1.5;transition:opacity .15s,transform .15s;position:absolute;transform:translateY(4px)}.tooltip.show{opacity:1;transform:translateY(0)}.tooltip .tt-title{color:var(--hl);margin-bottom:.15rem;font-weight:700;display:block}.topbar{border-bottom:1px solid var(--border);background:color-mix(in srgb, var(--bg) 86%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:50;align-items:center;gap:1rem;padding:.65rem 1.25rem;display:flex;position:sticky;top:0}.topbar .brand{letter-spacing:-.02em;color:var(--fg);align-items:center;gap:.5rem;font-weight:700;display:flex}.topbar .brand:hover{color:var(--hl);text-decoration:none}.topbar .brand .diamond{color:var(--hl)}.topbar nav{align-items:center;gap:.25rem;margin-left:auto;display:flex}.navlink{color:var(--fg-muted);border:1px solid #0000;border-radius:.5rem;padding:.3rem .7rem}.navlink:hover{background:var(--surface-hover);color:var(--fg);text-decoration:none}.navlink.active{color:var(--hl);border-color:var(--border);background:var(--bg-elevated)}.iconbtn{border:1px solid var(--border);color:var(--fg-muted);background:0 0;border-radius:.5rem;padding:.28rem .55rem;line-height:1;transition:all .15s}.iconbtn:hover{color:var(--fg);border-color:var(--border-strong);background:var(--surface-hover)}.login-wrap{place-items:center;min-height:100%;padding:2rem;display:grid}.login-card{background:var(--bg-elevated);border:1px solid var(--border);width:min(380px,100%);box-shadow:var(--shadow-card);border-radius:1rem;padding:2rem;animation:.25s both rise}.login-card h1{margin-bottom:.25rem;font-size:1.25rem}.login-card .sub{color:var(--fg-muted);margin-bottom:1.4rem;font-size:.85rem}.field{margin-bottom:1rem}.field label{color:var(--fg-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:.3rem;font-size:.78rem;display:block}.field input{background:var(--bg);width:100%;color:var(--fg);border:1px solid var(--border);border-radius:.55rem;outline:none;padding:.6rem .8rem;font-family:inherit;font-size:.95rem;transition:border-color .15s,box-shadow .15s}.field input:focus{border-color:var(--hl);box-shadow:0 0 0 3px var(--hl-soft)}.btn{border:1px solid var(--border-strong);background:var(--bg-elevated);color:var(--fg);-webkit-user-select:none;user-select:none;border-radius:.55rem;justify-content:center;align-items:center;gap:.5rem;padding:.55rem 1.1rem;font-weight:600;transition:all .15s;display:inline-flex}.btn:hover{border-color:var(--hl);color:var(--hl);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn.primary{background:var(--hl);border-color:var(--hl);color:var(--bg)}.btn.primary:hover{filter:brightness(1.1);color:var(--bg)}.btn.ghost{color:var(--fg-muted);border-color:#0000}.btn.ghost:hover{color:var(--fg);background:var(--surface-hover);transform:none}.btn:disabled{opacity:.45;pointer-events:none}.btn.block{width:100%}.form-error{color:var(--bad);min-height:1.2rem;margin-bottom:.6rem;font-size:.82rem;animation:.25s shake}@keyframes shake{25%{transform:translate(-4px)}75%{transform:translate(4px)}}.page{max-width:1080px;margin:0 auto;padding:1.6rem 1.4rem 3rem;animation:.2s both fadein}.hero{margin:1rem 0 1.6rem}.hero h1{font-size:1.5rem}.hero .sub{color:var(--fg-muted);max-width:60ch;margin-top:.35rem}.hero .examchip{color:var(--warn);border:1px dashed var(--warn);border-radius:2rem;margin-top:.8rem;padding:.25rem .7rem;font-size:.78rem;display:inline-block}.overall{flex-wrap:wrap;gap:1rem;margin-bottom:1.6rem;display:flex}.stat{background:var(--bg-elevated);border:1px solid var(--border);box-shadow:var(--shadow-card);border-radius:.8rem;flex:150px;padding:.9rem 1.1rem}.stat .big{color:var(--hl);font-size:1.5rem;font-weight:700}.stat .lbl{color:var(--fg-muted);text-transform:uppercase;letter-spacing:.07em;font-size:.75rem}.block-title{text-transform:uppercase;letter-spacing:.12em;color:var(--fg-muted);align-items:center;gap:.6rem;margin:1.6rem 0 .7rem;font-size:.78rem;display:flex}.block-title:after{content:"";background:var(--border);flex:1;height:1px}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:.9rem;display:grid}.lesson-card{background:var(--bg-elevated);border:1px solid var(--border);color:var(--fg);box-shadow:var(--shadow-card);border-radius:.9rem;padding:1rem 1.1rem .9rem;transition:transform .15s,border-color .15s,box-shadow .15s;display:block;position:relative;overflow:hidden}.lesson-card:hover{border-color:var(--hl);box-shadow:var(--shadow-pop);text-decoration:none;transform:translateY(-2px)}.lesson-card .num{color:var(--fg-subtle);letter-spacing:.1em;text-transform:uppercase;font-size:.72rem}.lesson-card h3{margin:.2rem 0 .3rem;font-size:1rem}.lesson-card .desc{color:var(--fg-muted);min-height:2.5em;font-size:.82rem}.lesson-card .meta{color:var(--fg-muted);align-items:center;gap:.7rem;margin-top:.7rem;font-size:.75rem;display:flex}.lesson-card .score{margin-left:auto;font-weight:700}.score.good{color:var(--ok)}.score.mid{color:var(--warn)}.score.low{color:var(--bad)}.pbar{background:var(--surface-hover);border-radius:2px;flex:1;height:4px;overflow:hidden}.pbar>i{background:var(--hl);border-radius:2px;height:100%;transition:width .45s cubic-bezier(.22,1,.36,1);display:block}.lesson-card.done .num:after{content:" ✓";color:var(--ok)}.lesson-shell{flex-direction:column;height:100vh;display:flex;overflow:hidden}.lesson-head{border-bottom:1px solid var(--border);align-items:center;gap:1rem;padding:.6rem 1.25rem;display:flex}.lesson-head .back{color:var(--fg-muted);white-space:nowrap;font-size:.85rem}.lesson-head .back:hover{color:var(--hl);text-decoration:none}.lesson-head .title{white-space:nowrap;text-overflow:ellipsis;font-size:.9rem;font-weight:700;overflow:hidden}.lesson-head .count{color:var(--fg-muted);white-space:nowrap;margin-left:auto;font-size:.78rem}.lesson-head .pbar{max-width:220px}.stage{flex:1;justify-content:center;display:flex;position:relative;overflow:hidden}.step{scrollbar-width:thin;justify-content:center;padding:2rem clamp(1.2rem,5vw,4rem) 2.5rem;display:flex;position:absolute;inset:0;overflow-y:auto}.step-inner{width:min(860px,100%);margin:auto 0}.step.anim-in-next{animation:.22s cubic-bezier(.22,1,.36,1) both stepInNext}.step.anim-in-prev{animation:.22s cubic-bezier(.22,1,.36,1) both stepInPrev}@keyframes stepInNext{0%{opacity:0;transform:translate(26px)}to{opacity:1;transform:none}}@keyframes stepInPrev{0%{opacity:0;transform:translate(-26px)}to{opacity:1;transform:none}}@keyframes fadein{0%{opacity:0}to{opacity:1}}@keyframes rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}.step h2{margin-bottom:.4rem;font-size:1.35rem}.step h2 .stepkicker{color:var(--hl);letter-spacing:.14em;text-transform:uppercase;margin-bottom:.5rem;font-size:.72rem;display:block}.step p{max-width:72ch;margin:.65rem 0}.step ul,.step ol{margin:.5rem 0;padding-left:1.4rem}.step li{margin:.3rem 0}.lesson-foot{border-top:1px solid var(--border);background:var(--bg);align-items:center;gap:1rem;padding:.7rem 1.25rem;display:flex}.lesson-foot .hintkeys{color:var(--fg-subtle);font-size:.72rem}.lesson-foot .spacer{flex:1}.dots{flex-wrap:wrap;justify-content:center;align-items:center;gap:.3rem;max-width:40vw;display:flex}.dot{background:var(--surface-hover);border:none;border-radius:50%;width:7px;height:7px;padding:0;transition:all .2s}.dot.seen{background:var(--border-strong)}.dot.now{background:var(--hl);transform:scale(1.45)}.dot.quiz{border-radius:2px}.callout{border:1px solid var(--border);border-left:3px solid var(--hl);background:var(--bg-elevated);box-shadow:var(--shadow-card);border-radius:.7rem;margin:1rem 0;padding:.8rem 1rem;font-size:.9rem}.callout .co-title{letter-spacing:.12em;text-transform:uppercase;color:var(--hl);margin-bottom:.3rem;font-size:.72rem;font-weight:700;display:block}.callout.analogy{border-left-color:var(--warn)}.callout.analogy .co-title{color:var(--warn)}.callout.key{border-left-color:var(--ok)}.callout.key .co-title{color:var(--ok)}.callout.danger{border-left-color:var(--bad)}.callout.danger .co-title{color:var(--bad)}.callout.info{border-left-color:var(--info)}.callout.info .co-title{color:var(--info)}details.hint{border:1px dashed var(--border-strong);background:var(--surface);border-radius:.7rem;margin:1rem 0;padding:.55rem .9rem;transition:border-color .15s}details.hint:hover{border-color:var(--hl)}details.hint summary{cursor:pointer;color:var(--hl);-webkit-user-select:none;user-select:none;font-size:.85rem;font-weight:600;list-style:none}details.hint summary:before{content:"▸ ";transition:transform .15s;display:inline-block}details.hint[open] summary:before{content:"▾ "}details.hint[open]{background:var(--bg-elevated);border-style:solid}details.hint .hint-body{padding-top:.5rem;font-size:.88rem;animation:.2s fadein}.codeblock{border:1px solid var(--border);background:var(--code-bg);box-shadow:var(--shadow-card);border-radius:.8rem;margin:1rem 0;overflow:hidden}.codeblock .code-head{color:var(--fg-muted);border-bottom:1px solid var(--border);background:var(--bg-elevated);align-items:center;gap:.6rem;padding:.45rem .9rem;font-size:.72rem;display:flex}.codeblock .lang{color:var(--hl);letter-spacing:.08em;text-transform:uppercase;font-weight:700}.codeblock pre{color:var(--code-fg);margin:0;padding:.8rem 0;font-size:.84rem;line-height:1.55;overflow-x:auto}.cline{white-space:pre;min-height:1.55em;padding:0 .9rem;display:block}.cline.note-line{cursor:help;background:linear-gradient(90deg, var(--hl-soft), transparent 85%);border-left:2px solid var(--hl);padding-left:calc(.9rem - 2px);transition:background .15s}.cline.note-line:hover,.cline.note-line.active{background:var(--hl-soft)}.cline.bad-line{background:linear-gradient(90deg, color-mix(in srgb, var(--bad) 14%, transparent), transparent 85%);border-left:2px solid var(--bad);cursor:help;padding-left:calc(.9rem - 2px)}.cline.good-line{background:linear-gradient(90deg, color-mix(in srgb, var(--ok) 13%, transparent), transparent 85%);border-left:2px solid var(--ok);cursor:help;padding-left:calc(.9rem - 2px)}.tok-kw{color:var(--code-kw);font-weight:600}.tok-fn{color:var(--code-fn)}.tok-str{color:var(--code-str)}.tok-com{color:var(--code-com);font-style:italic}.tok-num{color:var(--code-num)}.tok-cls{color:var(--code-cls)}.tok-var{color:var(--code-var)}.code-tip{color:var(--fg-subtle);border-top:1px dashed var(--border);padding:.35rem .9rem;font-size:.72rem}.cmp{border-collapse:collapse;width:100%;margin:1rem 0;font-size:.85rem}.cmp th,.cmp td{border:1px solid var(--border);text-align:left;vertical-align:top;padding:.5rem .7rem}.cmp th{background:var(--bg-elevated);color:var(--hl);text-transform:uppercase;letter-spacing:.08em;font-size:.75rem}.cmp tr:hover td{background:var(--surface-hover);transition:background .15s}.versus{grid-template-columns:1fr 1fr;gap:.9rem;margin:1rem 0;display:grid}@media (max-width:760px){.versus{grid-template-columns:1fr}}.versus .v-col{border:1px solid var(--border);background:var(--bg-elevated);border-radius:.8rem;padding:.8rem 1rem}.versus .v-col.bad{border-color:color-mix(in srgb, var(--bad) 45%, var(--border))}.versus .v-col.good{border-color:color-mix(in srgb, var(--ok) 45%, var(--border))}.versus .v-title{text-transform:uppercase;letter-spacing:.1em;margin-bottom:.4rem;font-size:.75rem;font-weight:700;display:block}.versus .bad .v-title{color:var(--bad)}.versus .good .v-title{color:var(--ok)}.versus ul{margin:.3rem 0;padding-left:1.2rem;font-size:.85rem}.quiz-q{margin-bottom:1rem;font-size:1.05rem;font-weight:700}.quiz-opts{flex-direction:column;gap:.55rem;margin:1rem 0;display:flex}.quiz-opt{text-align:left;background:var(--bg-elevated);border:1px solid var(--border);color:var(--fg);border-radius:.7rem;padding:.7rem .95rem;font-size:.9rem;line-height:1.5;transition:all .15s;position:relative}.quiz-opt:hover:not(:disabled){border-color:var(--hl);transform:translate(3px)}.quiz-opt:disabled{cursor:default}.quiz-opt .key{min-width:1.5em;color:var(--fg-subtle);font-weight:700;display:inline-block}.quiz-opt.correct{border-color:var(--ok);background:color-mix(in srgb, var(--ok) 10%, var(--bg-elevated));animation:.3s pulseok}.quiz-opt.wrong{border-color:var(--bad);background:color-mix(in srgb, var(--bad) 10%, var(--bg-elevated));animation:.25s shake}.quiz-opt.dim{opacity:.45}@keyframes pulseok{50%{transform:scale(1.012)}}.quiz-expl{margin-top:1rem;animation:.25s both rise}.quiz-meta{color:var(--fg-muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:.8rem;font-size:.78rem}.result-wrap{text-align:center;padding:1rem 0}.ring{--p:0;background:radial-gradient(closest-side, var(--bg) 79%, transparent 80% 100%), conic-gradient(var(--ringcolor,var(--hl)) calc(var(--p) * 1%), var(--surface-hover) 0);border-radius:50%;place-items:center;width:150px;height:150px;margin:1rem auto;transition:--p 1s;display:grid}.ring .pct{color:var(--ringcolor,var(--hl));font-size:1.7rem;font-weight:800}.result-msg{margin:.6rem 0 1.2rem;font-size:1rem}.result-actions{flex-wrap:wrap;justify-content:center;gap:.8rem;display:flex}.rank-table{border-collapse:collapse;width:100%;margin-top:1rem}.rank-table th,.rank-table td{border-bottom:1px solid var(--border);text-align:left;padding:.65rem .8rem;font-size:.9rem}.rank-table th{text-transform:uppercase;letter-spacing:.1em;color:var(--fg-muted);font-size:.72rem}.rank-table tr.me td{background:var(--hl-soft)}.rank-table .pos{color:var(--hl);font-weight:800}.medal{font-size:1.1rem}.empty{text-align:center;color:var(--fg-muted);border:1px dashed var(--border-strong);border-radius:1rem;margin-top:1rem;padding:3rem 1rem}.notfound{text-align:center;padding:5rem 1rem}.notfound .code{color:var(--hl);font-size:4rem;font-weight:800}.fade-in{animation:.2s both fadein}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}html[data-theme=dark] body,body{min-height:100%}body{font-family:var(--font-mono);background:var(--bg);color:var(--fg)}body:before{content:"";pointer-events:none;background-image:linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);opacity:.08;background-size:42px 42px;position:fixed;inset:0;-webkit-mask-image:linear-gradient(#000,#0000 72%);mask-image:linear-gradient(#000,#0000 72%)}main,header,section,article,form{position:relative}button,input{font:inherit}input{color:var(--fg)}.logout-form{margin:0}.brand-title{color:var(--hl)}.subject-hero{align-items:flex-start;gap:1rem;display:flex}.subject-icon{color:var(--hl);font-size:2rem;line-height:1}.subject-grid{gap:.9rem;display:grid}.lesson-card.locked{opacity:.62;pointer-events:none}.lesson-card .arrow{color:var(--hl)}.lesson-shell.next-shell{height:100dvh}.lesson-head .meta{align-items:center;gap:.8rem;min-width:0;display:flex}.step-inner .content-stack{gap:1rem;display:grid}.native-callout{border:1px solid var(--border);border-left:3px solid var(--hl);background:var(--bg-elevated);box-shadow:var(--shadow-card);border-radius:.7rem;margin:1rem 0;padding:.8rem 1rem;font-size:.9rem}.native-callout strong:first-child{letter-spacing:.12em;text-transform:uppercase;color:var(--hl);margin-bottom:.3rem;font-size:.72rem;display:block}.native-callout.analogy{border-left-color:var(--warn)}.native-callout.analogy strong:first-child{color:var(--warn)}.native-callout.key{border-left-color:var(--ok)}.native-callout.key strong:first-child{color:var(--ok)}.native-callout.warning{border-left-color:var(--bad)}.native-callout.warning strong:first-child{color:var(--bad)}.native-callout.tip{border-left-color:var(--info)}.native-callout.tip strong:first-child{color:var(--info)}.native-code{border:1px solid var(--border);background:var(--code-bg);box-shadow:var(--shadow-card);border-radius:.8rem;margin:1rem 0;overflow:hidden}.native-code figcaption{color:var(--fg-muted);border-bottom:1px solid var(--border);background:var(--bg-elevated);letter-spacing:.08em;text-transform:uppercase;align-items:center;gap:.6rem;padding:.45rem .9rem;font-size:.72rem;display:flex}.native-code pre{color:var(--code-fg);margin:0;padding:.8rem 0;font-size:.84rem;line-height:1.55;overflow-x:auto}.native-code code{white-space:pre;min-height:1.55em;padding:0 .9rem;display:block}.native-code code span{min-width:2.3rem;color:var(--fg-subtle);-webkit-user-select:none;user-select:none;display:inline-block}.native-code code.annotated.note{background:linear-gradient(90deg, var(--hl-soft), transparent 85%);border-left:2px solid var(--hl);cursor:help;padding-left:calc(.9rem - 2px)}.native-code code.annotated.bad{background:linear-gradient(90deg, color-mix(in srgb, var(--bad) 14%, transparent), transparent 85%);border-left:2px solid var(--bad);cursor:help;padding-left:calc(.9rem - 2px)}.native-code code.annotated.good{background:linear-gradient(90deg, color-mix(in srgb, var(--ok) 13%, transparent), transparent 85%);border-left:2px solid var(--ok);cursor:help;padding-left:calc(.9rem - 2px)}.lesson-rich{color:var(--fg);line-height:1.7}.lesson-rich>:first-child{margin-top:0}.lesson-rich>:last-child{margin-bottom:0}.lesson-rich p{color:var(--fg)}.lesson-rich code{border:1px solid var(--border);background:var(--code-bg);color:var(--code-fg);border-radius:.35rem;padding:.08rem .28rem}.quiz-placeholder{border:1px dashed var(--border-strong);background:var(--surface);border-radius:.7rem;padding:.85rem 1rem}.auth-note{color:var(--fg-subtle);text-align:center;margin-top:1rem;font-size:.78rem}.password-link{color:var(--fg-muted);margin-top:1rem;font-size:.82rem;display:inline-flex}.password-link:hover{color:var(--hl)}@media (max-width:720px){.topbar{flex-wrap:wrap;align-items:flex-start}.topbar nav{flex-wrap:wrap;width:100%;margin-left:0}.lesson-head{flex-wrap:wrap}.lesson-head .pbar{order:3;width:100%;max-width:none}.lesson-foot{flex-wrap:wrap}.dots{order:-1;width:100%;max-width:none}}
