.lesson-guide{padding:14px 24px;margin-bottom:24px;border:2px solid var(--info-line);border-radius:var(--r-md);background:var(--info-soft)}.lesson-guide>:not(pre){max-width:900px}.lesson-guide ol{margin:0;padding-left:22px;color:var(--ink-2);line-height:1.7}.lesson-guide .lesson-terms{margin-bottom:12px}.lesson-terms{display:grid;gap:10px;margin:0}.lesson-terms>div{display:grid;grid-template-columns:minmax(96px,150px) minmax(0,1fr);gap:2px 14px;align-items:baseline}.lesson-terms dt{font-weight:700;font-size:var(--fs-sm);overflow-wrap:anywhere}.lesson-terms dd{margin:0;color:var(--ink-2);line-height:1.6}.lesson-workspace{min-width:0;padding:clamp(16px,3vw,28px);background:var(--surface);border:2px solid var(--line);border-radius:var(--r-lg);--plot-1: color-mix(in oklab, var(--sky) 86%, black);--plot-2: color-mix(in oklab, var(--tang) 84%, black);--plot-3: color-mix(in oklab, var(--iris) 90%, black)}.lesson-workspace h2{font-size:30px}.lesson-workspace code{overflow-wrap:anywhere}.lesson-workspace .hint-step>div{min-width:0}.lesson-workspace .lesson-aim{margin:6px 0 0;color:var(--ink-3);font-size:var(--fs-sm)}.lesson-columns{display:grid;grid-template-columns:minmax(0,1fr);gap:0 32px}.lesson-columns>*{min-width:0}.lesson-task,.lesson-solution,.lesson-recall{margin-top:28px;border-top:2px solid var(--line)}.lesson-solution>button{margin-bottom:8px}.lesson-workspace .trace-table+p,.lesson-figure+p{margin-top:12px}.lesson-figure{max-width:460px;margin:14px 0 0;padding:14px 16px 12px;border:2px solid var(--line);border-radius:var(--r-sm)}.lesson-figure svg{display:block;width:100%;height:auto;overflow:visible}.lesson-figure figcaption{margin-top:10px;color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6}.lesson-figure figcaption code{font-size:.9em;background:var(--surface-2);padding:1px 5px;border-radius:4px}.lesson-plot-grid{stroke:var(--line);stroke-width:1}.lesson-plot-axis{stroke:var(--line-strong);stroke-width:1}.lesson-plot-tick,.lesson-plot-title,.lesson-plot-label{font-family:var(--font-body);font-size:12px;fill:var(--ink-3)}.lesson-plot-tick{font-variant-numeric:tabular-nums}.lesson-plot-title{fill:var(--ink-2)}.lesson-plot-label{fill:var(--ink);font-weight:700;paint-order:stroke;stroke:var(--surface);stroke-width:4px;stroke-linejoin:round}.lesson-plot-line{fill:none;stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.lesson-plot-dot{stroke:var(--surface);stroke-width:2}.lesson-plot-legend{display:flex;flex-wrap:wrap;gap:4px 18px;margin:8px 0 0;padding:0;list-style:none;color:var(--ink-2);font-size:var(--fs-xs)}.lesson-plot-legend li{display:flex;align-items:center;gap:7px}.lesson-plot-legend span{width:18px;height:2px;border-radius:1px}.lesson-grid{overflow-x:auto}.lesson-grid table{border-collapse:separate;border-spacing:2px;font-size:var(--fs-xs)}.lesson-grid th{padding:0 10px 0 0;color:var(--ink-2);font-weight:400;text-align:left;white-space:nowrap}.lesson-grid thead th{padding:0 4px 2px;color:var(--ink-3);text-align:center}.lesson-grid td{min-width:34px;height:30px;padding:0 6px;border-radius:6px;color:var(--ink);font-family:var(--font-code);font-variant-numeric:tabular-nums;text-align:center}.lesson-grid tbody td:not([class]):not(:empty){background:var(--surface-2)}.lesson-tone-a{background:color-mix(in oklab,var(--plot-1) 34%,var(--surface))}.lesson-tone-b{background:color-mix(in oklab,var(--plot-2) 34%,var(--surface))}.lesson-grid td.lesson-tone-off,.lesson-grid-key .lesson-tone-off{background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--line-strong);color:var(--ink-3)}.lesson-plot-legend.lesson-grid-key span{width:14px;height:14px;border-radius:4px}.lesson-bars{display:grid;gap:8px;font-size:var(--fs-sm)}.lesson-bars>div{display:grid;grid-template-columns:62px minmax(0,1fr);gap:10px;align-items:center;color:var(--ink-2)}.lesson-bar-area{display:flex;align-items:center;gap:8px;border-left:1px solid var(--line-strong);color:var(--ink);font-weight:700;font-variant-numeric:tabular-nums}.lesson-bar{flex:0 0 0;height:16px;border-radius:0 4px 4px 0;background:var(--plot-1)}.lesson-task .example{margin:22px 0 0}.lesson-also{margin-top:22px}.lesson-also ul{margin:0;padding-left:20px;color:var(--ink-2);line-height:1.7}.lesson-task>small{margin-top:18px}.lesson-recall details{margin:8px 0;padding:2px 14px;border:2px solid var(--line);border-radius:var(--r-sm);background:var(--surface-2)}.lesson-recall summary{font-weight:700;line-height:1.5}.lesson-recall details p{margin:0 0 12px}.lesson-actions{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.lesson-code-label{display:grid;gap:10px;margin:22px 0;line-height:1.6}.lesson-code-label textarea{min-height:90px;width:100%;box-sizing:border-box;resize:vertical;line-height:1.7;background:var(--sunken)}.lesson-code{height:320px;overflow:hidden;border:2px solid var(--line);border-radius:var(--r-sm);background:var(--code-bg)}.lesson-code .editor-mount{height:100%}.lesson-reference{height:auto;margin:18px 0}.lesson-workspace h4{margin:14px 0 6px;font-size:var(--fs-sm)}@media(min-width:1400px){.lesson-columns{grid-template-columns:minmax(0,1fr) minmax(0,1fr);grid-template-areas:"read code" "hints code";align-items:start}.lesson-read{grid-area:read}.lesson-columns>.hint-ladder{grid-area:hints}.lesson-solution>:not(.lesson-reference),.lesson-after>*{max-width:760px}.lesson-code-column{grid-area:code;position:sticky;top:16px;max-height:calc(100vh - 32px);overflow-y:auto}.lesson-code-column>.lesson-code-label{margin-top:24px}}@media(max-width:560px){.lesson-terms>div{grid-template-columns:minmax(0,1fr)}.lesson-grid td{min-width:24px;padding:0 3px}.lesson-grid th{padding-right:6px}}.ai-career-roadmap{max-width:1000px;margin-bottom:40px}.ai-views{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px;padding-bottom:14px;border-bottom:2px solid var(--line)}.ai-views button[aria-pressed=true]{border-color:var(--next);background:var(--next-soft)}.ai-views small{color:var(--ink-3);font-weight:400}.ai-link{display:inline;padding:0;border:0;background:none;color:var(--link);font-weight:600;text-decoration:underline}.ai-link:hover{background:none}.ai-tools{margin-top:22px}.ai-tools .lesson-terms>div{grid-template-columns:minmax(140px,280px) minmax(0,1fr)}.ai-tools dt code{font-size:var(--fs-xs)}@media(max-width:560px){.ai-tools .lesson-terms>div{grid-template-columns:minmax(0,1fr)}}.ai-code-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.ai-roadmap-intro{display:grid;grid-template-columns:2fr 1fr;gap:24px;padding:24px;border:2px solid var(--info-line);border-radius:var(--r-lg);background:var(--info-soft)}.ai-roadmap-intro h2{margin-top:0}.ai-roadmap-intro button{white-space:normal;text-align:left}.ai-study-guide{margin:20px 0;padding:18px;background:var(--surface);border-radius:var(--r-md);line-height:1.7;border:2px solid var(--line)}.ai-study-guide summary{cursor:pointer}.ai-milestone{margin:10px 0;border:2px solid var(--line);border-radius:var(--r-md);overflow:hidden;scroll-margin-top:20px;background:var(--surface)}.ai-milestone h3{margin:0}.ai-milestone h3 button{display:flex;width:100%;justify-content:space-between;gap:16px;padding:20px;border:0;border-radius:0;text-align:left;background:transparent;font-size:var(--fs-base);font-weight:700}.ai-milestone small{color:var(--ink-3);font-weight:400}.ai-milestone-content{padding:0 24px 24px}.ai-milestone h4{margin:24px 0 8px;font-size:17px}.ai-milestone fieldset{display:grid;gap:14px;padding:18px;margin:24px 0;border:2px solid var(--line);border-radius:var(--r-sm)}.ai-milestone fieldset label{display:flex;align-items:start;gap:10px;line-height:1.6}.ai-milestone input[type=checkbox]{width:18px;height:18px;flex-shrink:0;margin-top:3px;accent-color:var(--done)}.ai-evidence{display:grid;gap:10px;line-height:1.6}.ai-evidence textarea{width:100%;box-sizing:border-box;min-height:100px;resize:vertical}.ai-roadmap-labs button{margin:4px 8px 4px 0}.ai-milestone a{color:var(--link);overflow-wrap:anywhere}.ai-reading{margin:12px 0;padding:4px 18px;border:2px solid var(--line);border-radius:var(--r-sm);background:var(--surface-2)}.ai-reading summary{cursor:pointer;padding:12px 0;font-weight:700;line-height:1.5}.ai-reading summary span{margin-right:10px;color:var(--ink-3);font-size:var(--fs-xs);font-weight:400}.ai-reading ul,.ai-reading ol{margin:0 0 14px;padding-left:22px;color:var(--ink-2);line-height:1.7}.ai-reading li+li{margin-top:6px}.ai-reading .lesson-terms{margin:16px 0}.ai-reading figure{margin:16px 0}.ai-reading figcaption{margin-bottom:8px;color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6}.ai-reading pre{margin:0;padding:14px;overflow-x:auto;white-space:pre;background:var(--sunken);border:2px solid var(--line);border-radius:var(--r-sm);font-size:var(--fs-xs);line-height:1.6}.ai-reading .ai-lab-hint{margin:18px 0 14px}.ai-reading .ai-lab-hint ol{margin:8px 0 0}#ai-lab-workspace{scroll-margin-top:20px}@media(max-width:700px){.ai-roadmap-intro{grid-template-columns:1fr;padding:18px}.ai-milestone h3 button{flex-direction:column}.ai-milestone-content{padding:0 16px 16px}}.ai-path{max-width:1640px;margin:auto;padding:40px clamp(16px,4vw,48px);--hue: var(--sky)}.ai-path-heading{display:flex;justify-content:space-between;gap:30px;margin-bottom:32px}.ai-path-heading h1{margin:8px 0 16px;font-size:clamp(32px,5vw,52px)}.ai-path p{color:var(--ink-2);line-height:1.7}.ai-path-progress{display:grid;gap:10px;align-content:start;min-width:230px}.ai-path-progress strong{font-size:34px;font-family:var(--font-display);letter-spacing:-.02em}.ai-path-progress span{color:var(--ink-2)}.ai-path-progress progress{width:100%;accent-color:var(--done)}.ai-path-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px;align-items:start}.ai-path-nav{display:grid;gap:20px}.ai-path-nav h2{display:flex;justify-content:space-between;font-size:var(--fs-sm);color:var(--ink);margin:0 0 10px;font-family:var(--font-body);letter-spacing:0}.ai-path-nav h2 small{font-size:var(--fs-2xs)}.ai-path-nav button{width:100%;display:flex;justify-content:space-between;gap:10px;text-align:left;margin-bottom:6px;padding:12px;font-size:var(--fs-sm);font-weight:700}.ai-path-nav button[aria-current]{border-color:var(--next);background:var(--next-soft)}.ai-path-nav small{white-space:nowrap;color:var(--ink-3);font-weight:400}.ai-lab{min-width:0;padding:clamp(16px,3vw,28px);border:2px solid var(--line);border-radius:var(--r-lg);background:var(--surface)}.ai-lab h2{margin:8px 0 16px;font-size:30px}.ai-lab pre{white-space:pre-wrap;overflow-wrap:anywhere;padding:14px;background:var(--sunken);border-radius:var(--r-sm);line-height:1.6;border:2px solid var(--line)}.ai-lab details{margin:12px 0}.ai-lab summary{cursor:pointer;padding:8px 0}.ai-lab-editor{height:320px;overflow:hidden;border:2px solid var(--line);border-radius:var(--r-sm)}.ai-lab-editor .editor-mount{height:100%}.ai-lab-reference{height:auto;margin:18px 0;background:var(--code-bg)}.ai-lab-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:16px 0}.ai-lab-actions span{color:var(--ink-3);font-size:var(--fs-xs);margin-right:auto}.ai-lab-hint{border-left:4px solid var(--next);padding-left:16px}.ai-lab-note{font-size:var(--fs-sm);margin-top:24px}@media(max-width:900px){.ai-path-layout{grid-template-columns:1fr}.ai-path .ai-path-nav{max-height:330px;overflow:auto;padding-right:5px}.ai-path-heading{flex-direction:column}}:root,.coding-panel,.ai-lab-editor,.interview-editor,.solution-code,.lesson-code{color-scheme:dark;--bg: #0e1326;--surface: #161c35;--surface-2: #1e2545;--surface-3: #293257;--sunken: #0a0e1e;--code-bg: #10162c;--line: #29325a;--line-strong: #47528a;--ink: #f3f5fd;--ink-2: #c0c7e2;--ink-3: #8f99bf;--aqua: #2bd4c4;--sky: #4db5ff;--leaf: #43dd86;--rose: #ff6b93;--tang: #ff9447;--iris: #a88cff;--sun: #ffc93c;--next: var(--sun);--next-hover: #ffd75e;--next-edge: #b98300;--next-ink: #201800;--next-text: #ffd257;--done: var(--leaf);--done-text: #62e59c;--info-text: #7cc8ff;--warn-text: #ffb072;--bad-text: #ff90ab;--link: #7cc8ff;--focus: var(--sun);--shade: rgb(3 6 20 / .45);--scrim: rgb(5 8 22 / .72);--tint: 13%;--tint-line: 42%;--tile-border: 55%;--tile-edge: 38%;--line-rest: .38;--next-soft: color-mix(in oklab, var(--sun) var(--tint), var(--surface));--next-line: color-mix(in oklab, var(--sun) var(--tint-line), var(--surface));--done-soft: color-mix(in oklab, var(--leaf) var(--tint), var(--surface));--done-line: color-mix( in oklab, var(--leaf) var(--tint-line), var(--surface) );--info-soft: color-mix(in oklab, var(--sky) var(--tint), var(--surface));--info-line: color-mix(in oklab, var(--sky) var(--tint-line), var(--surface));--warn-soft: color-mix(in oklab, var(--tang) var(--tint), var(--surface));--warn-line: color-mix( in oklab, var(--tang) var(--tint-line), var(--surface) );--bad-soft: color-mix(in oklab, var(--rose) var(--tint), var(--surface));--bad-line: color-mix(in oklab, var(--rose) var(--tint-line), var(--surface))}:root[data-theme=light]{color-scheme:light;--bg: #f2f4fb;--surface: #ffffff;--surface-2: #edf0f9;--surface-3: #dfe4f3;--sunken: #f4f6fc;--line: #d5dbee;--line-strong: #a9b3d3;--ink: #141a33;--ink-2: #404969;--ink-3: #5d6789;--aqua: #0aa596;--sky: #2196f3;--leaf: #12a556;--rose: #ee4a78;--tang: #f9812f;--iris: #7a5cf5;--sun: #ffc42e;--next-hover: #ffd052;--next-edge: #d39400;--next-text: #855700;--done-text: #0a7c40;--info-text: #0f63b3;--warn-text: #ab4d07;--bad-text: #c21d4c;--link: #0f63b3;--focus: #2a5bd7;--shade: rgb(20 26 51 / .14);--scrim: rgb(20 26 51 / .45);--tint: 16%;--tint-line: 50%;--tile-border: 70%;--tile-edge: 52%;--line-rest: .5}:root{--font-display: "Bricolage Grotesque", "Atkinson Hyperlegible Next", system-ui, sans-serif;--font-body: "Atkinson Hyperlegible Next", system-ui, -apple-system, "Segoe UI", sans-serif;--font-code: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;--fs-2xs: .75rem;--fs-xs: .8125rem;--fs-sm: .875rem;--fs-md: .9375rem;--fs-base: 1rem;--r-sm: 9px;--r-md: 14px;--r-lg: 20px;font-family:var(--font-body);font-size:16px;color:var(--ink);background:var(--bg);font-synthesis:none;-webkit-font-smoothing:antialiased}.coding-panel,.ai-lab-editor,.interview-editor,.solution-code,.lesson-code{color:var(--ink)}.line-aqua{--hue: var(--aqua)}.line-sky{--hue: var(--sky)}.line-leaf{--hue: var(--leaf)}.line-rose{--hue: var(--rose)}.line-tang{--hue: var(--tang)}.line-iris{--hue: var(--iris)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;color:inherit;font-weight:600;background:var(--surface-2);border:2px solid var(--line);border-radius:var(--r-sm);padding:8px 14px;transition:background .15s,border-color .15s}button:hover{background:var(--surface-3);border-color:var(--line-strong)}button:disabled{opacity:.5;cursor:wait}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--focus);outline-offset:2px}button.primary{background:var(--next);border-color:var(--next);color:var(--next-ink);font-weight:800;box-shadow:0 4px 0 var(--next-edge);transition:background .15s,transform .07s,box-shadow .07s}button.primary:hover{background:var(--next-hover);border-color:var(--next-hover)}button.primary:active:not(:disabled){transform:translateY(3px);box-shadow:0 1px 0 var(--next-edge)}select,input,textarea{background:var(--sunken);color:var(--ink);border:2px solid var(--line);border-radius:var(--r-sm);padding:9px 12px}select:hover,input:hover,textarea:hover{border-color:var(--line-strong)}::placeholder{color:var(--ink-3);opacity:1}progress{-webkit-appearance:none;-moz-appearance:none;appearance:none;height:10px;border:0;border-radius:999px;overflow:hidden;background:var(--surface-3)}progress::-webkit-progress-bar{background:var(--surface-3)}progress::-webkit-progress-value{border-radius:999px;background:var(--done)}progress::-moz-progress-bar{border-radius:999px;background:var(--done)}h1,h2,h3,p{margin-top:0}h1,h2{font-family:var(--font-display);text-wrap:balance}h1{font-size:clamp(34px,4.2vw,52px);letter-spacing:-.025em;line-height:1.04;font-weight:800;margin-bottom:12px}h2{font-size:26px;letter-spacing:-.015em;line-height:1.15;font-weight:700}h3{font-size:var(--fs-base);font-weight:700}p{line-height:1.65;color:var(--ink-2)}pre,code{font-family:var(--font-code);font-size:var(--fs-sm);font-variant-ligatures:none}pre{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}small,.small-muted{font-size:var(--fs-xs);color:var(--ink-3)}.header{min-height:68px;border-bottom:2px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:32px;background:var(--surface)}.brand{background:none;border:0;padding:0;font-family:var(--font-display);font-size:23px;font-weight:800;gap:0;letter-spacing:-.03em}.brand:hover{background:none}.brand-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--next);color:var(--next-ink);border-radius:10px;margin-right:10px;box-shadow:0 3px 0 var(--next-edge)}.brand-light{color:var(--next-text)}.header nav{display:flex;align-items:center;gap:4px;min-width:0;overflow-x:auto;scrollbar-width:none}.header nav::-webkit-scrollbar{display:none}.header nav button{background:none;border:0;border-radius:10px;padding:8px 11px;color:var(--ink-2);font-size:var(--fs-sm);white-space:nowrap}.header nav button:hover{background:var(--surface-2);color:var(--ink)}.header nav button.active{background:var(--next-soft);color:var(--ink);box-shadow:inset 0 0 0 2px var(--next-line)}.header nav button.active svg{color:var(--next-text)}.header-right{margin-left:auto;display:flex;align-items:center;gap:8px;color:var(--ink-3);font-size:var(--fs-xs);flex-shrink:0}.local-dot{display:inline-block;width:8px;height:8px;background:var(--done);border-radius:50%;margin-right:4px}.icon-button{padding:8px;background:transparent;border:0;color:var(--ink-2)}@media(max-width:1500px){.header{padding:0 20px;gap:18px}.header nav svg{display:none}}@media(max-width:1280px){.header{flex-wrap:wrap;gap:0 12px;padding:0 14px}.brand{min-height:58px}.header nav{order:3;flex-basis:100%;margin:0 -14px;padding:0 14px 10px;overflow-x:auto;scrollbar-width:none}.header-right .local-label{display:none}}@media(max-width:480px){.brand{font-size:20px}.brand-icon{width:32px;height:32px;margin-right:8px}.header-right{gap:2px}.header-right .icon-button{padding:7px}}.roadmap-page{max-width:1550px;margin:0 auto;padding:44px 42px 28px}.page-heading{display:flex;align-items:center;gap:12px;margin-bottom:28px;flex-wrap:wrap}.page-heading>:first-child{margin-right:auto}.page-heading>button{flex-shrink:0;white-space:nowrap}.page-heading p{margin:0;font-size:17px}.eyebrow{display:flex;align-items:center;gap:8px;font-size:var(--fs-xs);color:var(--ink-2);font-weight:700;margin-bottom:12px}.eyebrow:before{content:"";flex-shrink:0;width:10px;height:10px;border-radius:3px;background:var(--hue, var(--next))}.roadmap-layout{display:grid;grid-template-columns:240px 1fr;gap:32px}.ticket{border-radius:var(--r-lg);color:var(--next-ink);background:var(--next);box-shadow:0 6px 0 var(--next-edge)}.ticket .eyebrow{--hue: var(--next-ink);color:var(--next-ink);margin-bottom:8px}.ticket p{color:color-mix(in oklab,var(--next-ink) 86%,var(--next))}.ticket small{color:color-mix(in oklab,var(--next-ink) 74%,var(--next));font-weight:600}.ticket button.primary{color:var(--sun);background:var(--next-ink);border-color:var(--next-ink);box-shadow:0 4px #00000073}.ticket button.primary:hover{color:#fff;background:var(--next-ink);border-color:var(--next-ink)}.ticket button.primary:active:not(:disabled){box-shadow:0 1px #00000073}.ticket button:not(.primary){color:var(--next-ink);background:transparent;border-color:color-mix(in oklab,var(--next-ink) 40%,var(--next))}.ticket button:not(.primary):hover{background:color-mix(in oklab,var(--next-ink) 10%,var(--next))}.recommendation-card{display:flex;align-items:center;justify-content:space-between;gap:28px;margin-bottom:32px;padding:24px 28px}.recommendation-copy h2{margin:0 0 6px;font-size:30px}.recommendation-copy p{max-width:680px;margin:0 0 8px;font-size:var(--fs-md);line-height:1.55}.recommendation-actions{display:flex;flex-direction:column;align-items:stretch;flex-shrink:0;gap:12px;min-width:190px;max-width:320px}.recommendation-actions button{justify-content:center;text-wrap:balance}.recommendation-actions .primary{padding:12px 20px;font-size:var(--fs-base)}.recommendation-card.compact{margin:24px 0;padding:16px 20px;border-radius:var(--r-md)}.recommendation-card.compact h2{font-size:21px}.cold-review{width:min(760px,calc(100% - 40px));margin:0 auto;padding:48px 0 80px;--hue: var(--aqua)}.cold-review>.eyebrow{margin-top:30px}.cold-review>h1{margin:8px 0}.cold-review>p,.cold-review-context>p{color:var(--ink-3);line-height:1.7}.recall-prompt,.recall-prompt label{display:grid;gap:9px}.recall-prompt{gap:18px;margin-top:28px}.recall-prompt label{color:var(--ink-2);font-size:var(--fs-sm)}.recall-prompt textarea{min-height:110px;resize:vertical}.recall-prompt .primary{justify-self:start}.cold-review.coding{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(420px,1.2fr);gap:18px;width:min(1180px,calc(100% - 40px))}.cold-review-context{padding:22px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface)}.cold-review-context h1{margin:8px 0;font-size:24px}.recall-summary{display:grid;gap:5px;margin:22px 0;padding:14px;border-radius:var(--r-sm);background:var(--sunken)}.recall-summary span{color:var(--ink-3);font-size:var(--fs-xs);font-weight:700}.recall-summary strong+span{margin-top:10px}.previous-work{margin-top:12px;padding:13px;border:2px solid var(--warn-line);border-radius:var(--r-sm);color:var(--ink-2);background:var(--warn-soft);font-size:var(--fs-sm);line-height:1.6}.previous-work pre{overflow:auto;margin-bottom:0;color:var(--ink-2);white-space:pre-wrap}.cold-help-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.cold-review .coding-panel{height:calc(100dvh - 150px);min-height:580px}.coding-panel>.reference-editor{flex:1;min-height:180px;overflow:auto}.run-bar.cold-rating{flex-wrap:wrap}.run-bar.cold-rating>span{display:inline;white-space:nowrap;color:var(--ink-2);font-size:var(--fs-sm)}.journey{padding-top:4px}.journey .eyebrow{--hue: var(--done)}.progress-count{font-family:var(--font-display);font-size:64px;font-weight:800;letter-spacing:-.04em;line-height:1}.progress-count span{font-size:22px;font-weight:600;letter-spacing:0;color:var(--ink-3)}.journey>p{font-size:var(--fs-sm);margin:6px 0 16px}.progress-track{height:12px;background:var(--surface-3);border-radius:999px;overflow:hidden}.progress-track i,.node-track i{display:block;height:100%;border-radius:inherit;background:var(--done)}.difficulty-counts{margin-top:20px;padding-bottom:20px;border-bottom:2px solid var(--line)}.difficulty-counts>div{display:flex;justify-content:space-between;font-size:var(--fs-md);font-weight:700;margin:10px 0;font-variant-numeric:tabular-nums}.difficulty-counts small{margin-left:2px;font-weight:400}.streak-card{margin:22px 0 28px;padding:16px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface)}.streak-heading{display:flex;align-items:center;gap:12px}.streak-heading>svg{width:42px;height:42px;padding:10px;border-radius:12px;color:var(--ink-3);background:var(--surface-2)}.streak-card.lit .streak-heading>svg{color:var(--tang);background:var(--warn-soft)}.streak-heading div{display:flex;flex-direction:column;gap:1px}.streak-heading strong{font-family:var(--font-display);color:var(--ink);font-size:21px;line-height:1.1}.streak-heading small{color:var(--ink-3);font-size:var(--fs-xs)}.activity-strip{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:16px}.activity-strip>span{display:grid;gap:5px;text-align:center}.activity-strip i{display:block;height:24px;border:2px solid var(--line);border-radius:7px;background:var(--surface-2)}.activity-strip i.active{border-color:var(--tang);background:var(--tang)}.activity-strip small{color:var(--ink-3);font-size:var(--fs-2xs)}.reflection-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;display:flex;justify-content:flex-end;background:var(--scrim)}.reflection-drawer{width:min(520px,100%);height:100%;overflow:auto;padding:34px;border-left:2px solid var(--line);background:var(--surface);box-shadow:-18px 0 50px var(--shade)}.reflection-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:24px}.reflection-header h2{margin-bottom:8px;outline:none}.reflection-header p,.reflection-backlog>p{margin:0;color:var(--ink-3);font-size:var(--fs-sm)}.reflection-drawer form,.reflection-drawer label{display:grid;gap:8px}.reflection-drawer form{gap:18px}.reflection-drawer label{color:var(--ink-2);font-size:var(--fs-sm)}.reflection-drawer input,.reflection-drawer textarea,.reflection-drawer select{width:100%}.reflection-drawer textarea{min-height:92px;resize:vertical}.reflection-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.reflection-actions{display:flex;gap:10px}.reflection-drawer .reflection-checkbox{display:flex;grid-template-columns:auto 1fr;align-items:center;gap:9px}.reflection-drawer .reflection-checkbox input{width:auto;accent-color:var(--done)}.reflection-backlog{margin:28px 0;padding:20px;border:2px solid var(--line-strong);border-radius:var(--r-md);background:var(--surface)}.easy{color:var(--done-text)!important}.medium{color:var(--warn-text)!important}.hard{color:var(--bad-text)!important}.journey-note{margin:26px 0;color:var(--ink-3)}.journey-note h3{color:var(--ink);margin:10px 0 4px;font-size:var(--fs-md)}.journey-note p{font-size:var(--fs-sm);line-height:1.6}.small-muted{display:block;line-height:1.7;margin-top:30px}.map-panel{border:2px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--surface)}.map-toolbar{min-height:52px;padding:0 20px;border-bottom:2px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:var(--fs-xs);color:var(--ink-3)}.map-toolbar>span:first-child{color:var(--ink);font-size:var(--fs-md);font-weight:700}.map-scroll{overflow:auto;background-image:radial-gradient(var(--line) 1.5px,transparent 1.5px);background-size:24px 24px}.map-canvas{position:relative;width:100%;min-width:900px;aspect-ratio:1660 / 1420}.map-lines{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;fill:none}.map-lines path{stroke:var(--hue);stroke-width:6;stroke-linecap:round;vector-effect:non-scaling-stroke;opacity:var(--line-rest)}.map-lines path.traveled{opacity:1}.topic-node{position:absolute;width:16.27%;min-height:6.3%;padding:8px 12px;display:flex;flex-direction:column;align-items:stretch;gap:7px;text-align:left;border:2px solid color-mix(in oklab,var(--hue) var(--tile-border),var(--surface));background:var(--surface);border-radius:12px;box-shadow:0 4px color-mix(in oklab,var(--hue) var(--tile-edge),var(--bg));font-size:var(--fs-xs);line-height:1.15;font-weight:700;transition:background .15s,transform .08s,box-shadow .08s}.topic-node>span:first-child{display:flex;align-items:center;gap:7px}.topic-node>span:first-child:before{content:"";flex-shrink:0;width:11px;height:11px;border:3px solid var(--hue);border-radius:50%}.topic-node:hover{background:color-mix(in oklab,var(--hue) 14%,var(--surface));border-color:var(--hue);transform:translateY(-2px);box-shadow:0 6px color-mix(in oklab,var(--hue) var(--tile-edge),var(--bg))}.topic-node:active{transform:translateY(3px);box-shadow:0 1px color-mix(in oklab,var(--hue) var(--tile-edge),var(--bg))}.topic-node.complete{border-color:var(--hue);background:color-mix(in oklab,var(--hue) 24%,var(--surface))}.topic-node.complete>span:first-child:before{background:var(--hue)}.node-bottom{display:flex;align-items:center;gap:8px;width:100%;margin-top:auto}.node-track{height:5px;background:var(--surface-3);display:block;flex:1;border-radius:999px;overflow:hidden}.node-track i{background:var(--hue)}.node-bottom small{font-size:var(--fs-2xs);font-weight:600;color:var(--ink-3);font-variant-numeric:tabular-nums}.map-footer{min-height:48px;padding:10px 20px;display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;font-size:var(--fs-xs);color:var(--ink-2);border-top:2px solid var(--line)}.map-footer>span{display:flex;align-items:center;gap:7px}.map-footer i{width:18px;height:6px;border-radius:999px;background:var(--hue)}.map-caption{margin-left:auto;color:var(--ink-3)}.library{max-width:1150px;margin:0 auto;padding:50px 30px}.filters{display:flex;gap:12px;margin:30px 0 18px}.search{display:flex;align-items:center;gap:8px;border:2px solid var(--line);border-radius:var(--r-sm);padding-left:14px;flex:1;color:var(--ink-3);background:var(--sunken)}.search:hover{border-color:var(--line-strong)}.search input{border:0;flex:1;min-width:0;background:transparent}.problem-table{border:2px solid var(--line);border-radius:var(--r-md);overflow:hidden;background:var(--surface)}.table-row{display:grid;grid-template-columns:65px 1.6fr 1.2fr 100px 20px;align-items:center;width:100%;text-align:left;justify-content:stretch;padding:15px 22px;gap:12px;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;font-size:var(--fs-sm);font-weight:400}.table-row strong{font-size:var(--fs-base);font-weight:700}.table-row:last-child{border-bottom:0}.table-row>.easy,.table-row>.medium,.table-row>.hard{font-weight:700}.topic-cell{display:inline-flex;align-items:center;gap:8px}.topic-cell:before{content:"";flex-shrink:0;width:9px;height:9px;border-radius:50%;background:var(--hue)}.table-head{background:var(--surface-2);color:var(--ink-3);font-size:var(--fs-xs);font-weight:700}.table-head:hover{background:var(--surface-2)}.muted{color:var(--ink-3)}.empty-circle{width:18px;height:18px;border:2px solid var(--line-strong);border-radius:50%;display:block}.practice{padding:0 14px 14px;height:calc(100vh - 70px);display:flex;flex-direction:column}.practice-breadcrumb{display:flex;align-items:center;gap:10px;height:48px;flex-shrink:0;color:var(--ink-3);font-size:var(--fs-xs)}.practice-breadcrumb button{border:0;background:none;padding:6px 8px;font-size:var(--fs-xs);color:var(--ink-2)}.practice-next{margin-left:auto}.workspace{display:grid;grid-template-columns:minmax(320px,43%) minmax(380px,57%);gap:10px;min-height:0;flex:1}.question-panel,.coding-panel{border:2px solid var(--line);border-radius:var(--r-md);overflow:hidden;background:var(--surface);min-width:0}.question-panel{display:flex;flex-direction:column}.panel-tabs{display:flex;gap:2px;border-bottom:2px solid var(--line);min-height:48px;background:var(--surface);padding:0 10px}.panel-tabs button{background:none;border:0;border-radius:0;color:var(--ink-3);padding:12px 10px;font-size:var(--fs-sm)}.panel-tabs .selected{color:var(--ink);box-shadow:inset 0 -3px var(--next)}.panel-tabs small{font-size:var(--fs-2xs);color:var(--ink-2);background:var(--surface-3);border-radius:999px;padding:1px 7px}.question-body{overflow:auto;padding:28px 30px}.lesson-reminder{display:flex;justify-content:space-between;align-items:flex-start;gap:22px;margin-bottom:24px;padding:16px;border:2px solid var(--info-line);border-radius:var(--r-md);background:var(--info-soft)}.lesson-reminder strong,.lesson-reminder p{display:block;margin:6px 0 0}.lesson-reminder p{color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6}.lesson-reminder button{flex-shrink:0}.notebook-page{width:min(1120px,calc(100% - 48px));margin:0 auto;padding:48px 0 80px;--hue: var(--tang)}.notebook-page .page-heading{align-items:end}.notebook-page .page-heading>strong{color:var(--ink-2);font-size:var(--fs-sm)}.notebook-page .filters{margin:30px 0 38px}.notebook-page .search{flex:1}.notebook-group{margin:36px 0}.notebook-group>h2{margin-bottom:14px;color:var(--ink);font-size:18px}.notebook-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:14px}.notebook-card{padding:18px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface)}.notebook-card-heading,.notebook-card-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.notebook-card-heading>div{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.notebook-problem{padding:0;border:0;color:var(--link);font-weight:700;background:none}.notebook-card textarea{width:100%;min-height:110px;margin:16px 0 12px;resize:vertical}.notebook-card-footer small,.notebook-empty{color:var(--ink-3)}.notebook-empty{padding:50px 20px;border:2px dashed var(--line);border-radius:var(--r-md);text-align:center}.question-title{display:flex;justify-content:space-between;align-items:start;gap:12px}.question-title h2{font-size:30px;margin-bottom:12px}.badges{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 24px}.badge{font-size:var(--fs-xs);font-weight:700;background:var(--surface-2);border-radius:999px;padding:4px 11px;color:var(--ink-2)}.badge.easy{background:var(--done-soft)}.badge.medium{background:var(--warn-soft)}.badge.hard{background:var(--bad-soft)}.badge.topic-cell{color:var(--ink);background:color-mix(in oklab,var(--hue) 18%,var(--surface))}.description{font-size:var(--fs-base);line-height:1.7;color:var(--ink);margin-bottom:24px}.description code,.example-explanation code,.hint-step code,.learning-section code,.cold-review-context code,.interview-code header code{font-size:.9em;background:var(--surface-2);padding:1px 5px;border-radius:4px}.callout{display:flex;align-items:flex-start;gap:10px;color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6;background:var(--info-soft);border:2px solid var(--info-line);border-radius:var(--r-sm);padding:14px;margin-bottom:30px}.callout svg{flex-shrink:0;margin-top:2px;color:var(--info-text)}.callout code{font-size:var(--fs-xs);background:var(--surface);padding:2px 5px;border-radius:4px}.example{margin-bottom:26px}.example h3{margin-bottom:10px;font-size:var(--fs-sm)}.example pre{background:var(--sunken);border:2px solid var(--line);border-radius:var(--r-sm);padding:16px;color:var(--ink);margin:0;font-size:var(--fs-sm)}.example pre span{color:var(--ink-3);font-weight:700}.hint-ladder{margin:26px 0;padding:16px;border:2px solid var(--warn-line);border-radius:var(--r-md);background:var(--warn-soft)}.hint-ladder-heading,.hint-ladder-heading>div,.hint-next{display:flex;align-items:center}.hint-ladder-heading{justify-content:space-between;gap:14px;color:var(--warn-text);font-weight:700}.hint-ladder-heading>div{gap:8px}.hint-ladder-heading small{color:var(--ink-3);font-weight:400;white-space:nowrap}.hint-ladder-note{margin:8px 0 0;color:var(--ink-2);font-size:var(--fs-xs);line-height:1.6}.topic-content-note{margin:0;padding:14px 0;color:var(--ink-2);font-size:var(--fs-xs)}.topic-content-note button{color:var(--info-text);text-decoration:underline}.hint-step{display:grid;grid-template-columns:62px 1fr;gap:12px;margin-top:14px;padding-top:14px;border-top:1px solid var(--warn-line)}.hint-step>span{color:var(--warn-text);font-size:var(--fs-xs);font-weight:700}.hint-step strong{color:var(--ink);font-size:var(--fs-sm)}.hint-step p{margin:5px 0 0;color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6}.hint-step a{display:inline-block;margin-top:6px;color:var(--link);font-size:var(--fs-sm);font-weight:700}.hint-next{justify-content:space-between;width:100%;margin-top:14px;color:var(--warn-text);border-color:var(--warn-line);background:transparent;font-size:var(--fs-sm)}.contract{margin-top:28px;border-top:1px solid var(--line);padding-top:22px}.contract p{font-size:var(--fs-sm)}.coding-panel{display:flex;flex-direction:column;background:var(--code-bg)}.editor-toolbar{height:48px;display:flex;align-items:center;border-bottom:2px solid var(--line);padding:0 12px;flex-shrink:0;background:var(--surface)}.editor-toolbar select{background:transparent;border:0;padding:6px;font-size:var(--fs-sm);font-weight:700}.editor-toolbar-right{margin-left:auto;display:flex;gap:8px;align-items:center}.vim{background:none;border:0;font-size:var(--fs-xs);padding:5px}.vim.enabled{color:var(--done-text)}.file-tab{display:flex;align-items:center;gap:8px;height:36px;padding:0 18px;border-bottom:1px solid var(--line);font-family:var(--font-code);font-size:var(--fs-2xs);color:var(--ink-2);flex-shrink:0}.saved-label{margin-left:auto;color:var(--ink-3);font-family:var(--font-body);font-size:var(--fs-2xs);display:flex;align-items:center;gap:4px}.editor-mount{flex:1;min-height:180px;overflow:hidden}.editor-status{display:flex;justify-content:space-between;color:var(--ink-3);font-size:var(--fs-2xs);padding:7px 12px;border-top:1px solid var(--line);flex-shrink:0}.console{border-top:2px solid var(--line);max-height:43%;overflow:auto;flex-shrink:0;background:var(--surface);min-height:128px}.console-toolbar{display:flex;align-items:center;justify-content:space-between;height:42px;padding:0 12px;border-bottom:1px solid var(--line);font-size:var(--fs-xs)}.console-toolbar strong{display:flex;align-items:center;gap:8px;font-weight:500}.console-toolbar button{background:none;border:0;color:var(--ink-2);font-size:var(--fs-xs);padding:5px 6px}.console-body{padding:14px 16px}.empty-console{display:flex;align-items:center;gap:10px;color:var(--ink-3);font-size:var(--fs-sm);padding:10px 0}.run-bar{display:flex;align-items:center;gap:10px;padding:11px 14px 15px;border-top:2px solid var(--line);flex-shrink:0;background:var(--surface)}.run-bar>span{margin-right:auto;font-size:var(--fs-2xs);color:var(--ink-3)}.run-bar button{font-size:var(--fs-sm);padding:8px 18px;white-space:nowrap}.result-heading{display:flex;align-items:center;gap:14px;margin-bottom:12px}.result-heading strong{font-family:var(--font-display);font-size:22px;letter-spacing:-.01em}.result-heading strong.easy{animation:verdict-pop .35s cubic-bezier(.2,1.4,.4,1)}@keyframes verdict-pop{0%{transform:scale(.7);opacity:0}}.confetti{position:fixed;left:50%;top:44%;z-index:200;pointer-events:none}.confetti i{position:absolute;width:10px;height:15px;border-radius:3px;opacity:0;animation:confetti-burst 1.25s cubic-bezier(.12,.72,.3,1) var(--delay) forwards}.lab-result{margin:18px 0;padding:16px 18px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface-2)}.lab-result.accepted{border-color:var(--done-line);background:var(--done-soft)}.lab-result h3{margin-bottom:8px;font-family:var(--font-display);font-size:22px}.lab-result.accepted h3{color:var(--done-text);animation:verdict-pop .35s cubic-bezier(.2,1.4,.4,1)}.lab-result details{margin:6px 0;font-size:var(--fs-sm);font-weight:700}.lab-result pre{font-weight:400}@keyframes confetti-burst{0%{opacity:1;transform:translate(0) rotate(0) scale(.5)}45%{opacity:1;transform:translate(var(--x),var(--y)) rotate(calc(var(--spin) * .6)) scale(1)}to{opacity:0;transform:translate(calc(var(--x) * 1.12),calc(var(--y) + 220px)) rotate(var(--spin)) scale(.9)}}.result-heading small{font-size:var(--fs-xs)}.case-results{display:flex;flex-wrap:wrap;gap:8px}.case-results details{background:var(--surface-2);padding:7px 12px;border-radius:8px;font-size:var(--fs-xs);font-weight:700}.case-results details[open]{width:100%}.case-results summary{cursor:pointer}.case-results pre{font-size:var(--fs-xs);font-weight:400;margin-bottom:0}.logs{font-size:var(--fs-xs);color:var(--warn-text)}.custom-label{display:block;padding:12px 15px;color:var(--ink-2);font-size:var(--fs-xs)}.custom-label textarea{display:block;width:100%;height:80px;resize:vertical;margin-top:8px;font-family:var(--font-code);font-size:var(--fs-xs)}.solution-code{border:2px solid var(--line);border-radius:var(--r-sm);overflow:hidden;background:var(--code-bg)}.reference-editor .cm-editor{height:auto}.reference-editor .cm-scroller{overflow:auto}.submission-list pre{background:var(--surface);border:2px solid var(--line);border-radius:5px;padding:16px;font-size:var(--fs-sm)}.submission-list details{border-bottom:1px solid var(--line);padding:16px 0}.submission-list summary{cursor:pointer;display:flex;flex-direction:column;gap:7px;font-size:var(--fs-md)}.submission-list p{font-size:var(--fs-xs);margin-top:12px}.submission-list button{font-size:var(--fs-xs)}.empty-state{padding:45px 20px;text-align:center;color:var(--ink-3)}.empty-state h3{color:var(--ink);margin:15px 0 6px}.empty-state p{font-size:var(--fs-sm)}.notice{background:var(--warn-soft);color:var(--warn-text);border-bottom:2px solid var(--warn-line);padding:10px 28px;display:flex;align-items:center;justify-content:space-between;font-size:var(--fs-sm);font-weight:600}.notice button{font-size:var(--fs-xs)}@media(min-width:1600px){.map-canvas{max-height:calc(100vh - 310px);min-height:650px}.roadmap-page{max-width:1600px}.topic-node{font-size:var(--fs-md)}}@media(max-width:1000px){.roadmap-page{padding:30px 24px}.roadmap-layout{grid-template-columns:160px 1fr;gap:20px}.question-body{padding:22px}.panel-tabs{padding:0 4px}.panel-tabs button{padding:12px 7px;font-size:var(--fs-xs)}.workspace{grid-template-columns:40% 60%;gap:7px}.practice{padding:0 8px 8px}.run-bar>span{display:none}.run-bar{justify-content:flex-end}.editor-status{font-size:var(--fs-2xs)}.map-toolbar>span:last-child{display:none}}@media(max-width:720px){.roadmap-page{padding:28px 16px}.page-heading{align-items:flex-start;gap:15px}.page-heading p{font-size:var(--fs-base)}.roadmap-layout{display:flex;flex-direction:column}.journey{padding:0;display:grid;grid-template-columns:1fr 1fr;gap:4px 20px}.journey .eyebrow{grid-column:1/-1;margin-bottom:4px}.journey>p{margin:0;align-self:center}.progress-count{font-size:44px}.progress-track{grid-column:1/-1;margin:10px 0}.difficulty-counts{grid-column:1/-1;display:flex;justify-content:space-between;padding:0;border:0;margin:0}.difficulty-counts>div{gap:12px}.journey-note,.journey .small-muted{display:none}.streak-card{grid-column:1/-1;margin:12px 0 4px}.map-caption{display:none}.library{padding:28px 16px}.filters{flex-wrap:wrap}.search{flex-basis:100%}.filters select{flex:1;min-width:0;font-size:var(--fs-xs)}.table-row{grid-template-columns:25px 1fr 70px 12px;padding:15px 12px;gap:10px}.table-row .topic-cell,.table-head>span:nth-child(3){display:none}.table-row strong{font-size:var(--fs-md)}.practice{height:auto;min-height:calc(100vh - 60px)}.workspace{display:flex;flex-direction:column}.question-panel{max-height:520px}.coding-panel{height:740px}.question-body{padding:22px}.editor-mount{min-height:230px}.panel-tabs button{font-size:var(--fs-sm)}.run-bar>span{display:inline;margin-right:auto}.practice-breadcrumb,.editor-status{font-size:var(--fs-2xs)}.console{max-height:38%}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}.confetti{display:none}}.workspace{grid-template-columns:minmax(260px,var(--split, 43%)) 10px minmax(0,1fr);gap:0}.split-handle{cursor:col-resize;display:flex;align-items:center;justify-content:center;touch-action:none;outline-offset:-2px}.split-handle span{width:4px;height:46px;border-radius:4px;background:var(--line-strong)}.split-handle:hover span,.split-handle:focus-visible span{background:var(--next)}.editor-toolbar-right>button{font-size:var(--fs-xs);padding:5px 9px;background:transparent}.editor-toolbar{gap:4px}.editor-toolbar select{max-width:130px}.shortcut-help{font-size:var(--fs-2xs);color:var(--ink-3);padding:6px 12px;border-top:1px solid var(--line);flex-shrink:0}.console.console-collapsed{min-height:40px;max-height:40px}.console-collapsed .console-body,.console-collapsed .custom-label{display:none}.constraints{padding:14px 0;border-top:1px solid var(--line)}.constraints h3{margin-bottom:6px}.constraints p,.example-explanation{font-size:var(--fs-sm)}.example-explanation{margin:12px 0;color:var(--ink-2)}.solution-video{margin-bottom:24px;padding:18px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface-2)}.video-heading,.video-actions,.video-actions a,.video-search{display:flex;align-items:center;gap:9px}.video-heading>svg{color:var(--bad-text);flex-shrink:0}.walkthrough .video-heading>svg{color:var(--info-text)}.video-heading h3{margin:0;font-size:var(--fs-base)}.video-language{margin-left:auto;color:var(--warn-text);font-size:var(--fs-xs)}.solution-video p{color:var(--ink-2);font-size:var(--fs-sm);line-height:1.6}.video-player{display:block;width:100%;aspect-ratio:16 / 9;border:0;border-radius:5px;margin:14px 0}.walkthrough-locked{position:relative;overflow:hidden;background:var(--sunken)}.walkthrough-locked img{width:100%;height:100%;object-fit:cover;opacity:.45}.walkthrough-offer{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:16px;text-align:center;background:color-mix(in srgb,var(--surface) 72%,transparent)}.solution-video .walkthrough-offer p{display:flex;align-items:center;gap:7px;margin:0;color:var(--ink);font-size:var(--fs-md)}.video-actions{flex-wrap:wrap;margin:14px 0}.video-actions button{display:inline-flex;align-items:center;gap:7px;padding:8px 12px}.video-actions a,.video-search{color:var(--link);font-size:var(--fs-sm);text-decoration:none}.video-actions a:hover,.video-search:hover{text-decoration:underline}.solution-video .video-help{color:var(--ink-3);font-size:var(--fs-xs)}.video-search{width:fit-content}.video-search svg{flex-shrink:0}.learning-section>h3,.read-heading{margin:24px 0 8px}.read-heading{display:flex;align-items:center;gap:6px}.read-heading h3{margin:0}.read-button{padding:6px;border-radius:50%;color:var(--info-text)}.read-button:hover,.read-button.reading{background:var(--info-soft)}.read-button.locked{position:relative;color:var(--ink-3)}.read-button .lock-badge{position:absolute;right:1px;bottom:1px;padding:1px;border-radius:50%;background:var(--surface)}.learning-section>p{color:var(--ink-2);font-size:var(--fs-md)}.complexity{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0 12px}.complexity>div{padding:14px;background:var(--surface-2);border-radius:var(--r-sm)}.complexity small{display:block;color:var(--ink-3);font-size:var(--fs-xs);font-weight:700;margin-bottom:6px}.complexity strong{font-size:var(--fs-md);font-weight:700;line-height:1.6;display:block;font-family:var(--font-code)}.learning-section>small{line-height:1.7;display:block;margin-bottom:24px}.solution-steps,.solution-pitfalls{margin:0;padding-left:22px;color:var(--ink-2);font-size:var(--fs-md);line-height:1.7}.solution-steps li,.solution-pitfalls li{margin-bottom:8px}.solution-steps strong{color:var(--ink)}.learning-section .example{margin-bottom:14px}.trace-table{overflow-x:auto;border:2px solid var(--info-line);border-radius:var(--r-sm);background:var(--info-soft)}.trace-table table{width:100%;border-collapse:collapse;font-size:var(--fs-sm)}.trace-table th,.trace-table td{padding:9px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--info-line)}.trace-table th{color:var(--info-text);font-weight:700;white-space:nowrap}@media(min-width:721px){.trace-table th{white-space:normal}}.trace-table td{color:var(--ink-2);font-family:var(--font-code)}.trace-table tr:last-child td{border-bottom:0}.learning-section a{color:var(--info-text)}.solution-code .file-tab{height:auto;min-height:40px;justify-content:space-between;padding:5px 9px}.solution-code .file-tab select{font-size:var(--fs-xs);padding:4px;background:transparent;border:0}.solution-code .file-tab button{font-size:var(--fs-2xs);padding:5px 8px}.review-notes{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}.review-notes textarea{width:100%;min-height:100px;resize:vertical;font-size:var(--fs-sm)}.review-actions{display:flex;gap:6px;flex-wrap:wrap;margin:12px 0}.review-actions button{font-size:var(--fs-xs);padding:7px 10px}.review-row{padding:18px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.review-row>div:first-child{display:flex;flex-direction:column;gap:8px}.review-row>div:first-child>button{background:transparent;border:0;padding:0;justify-content:flex-start}.review-row:last-child{margin-bottom:28px}.import-preview{margin:20px auto;padding:20px;max-width:900px;background:var(--info-soft);border:2px solid var(--info-line);border-radius:var(--r-md)}.import-preview button{margin-right:8px}.import-preview p{font-size:var(--fs-sm);color:var(--ink-2)}.submission-diff{padding:18px 0;border-bottom:1px solid var(--line-strong)}.diff-selects{display:grid;grid-template-columns:1fr 1fr;gap:8px}.diff-selects label{font-size:var(--fs-xs);min-width:0;color:var(--ink-2)}.diff-selects select{width:100%;font-size:var(--fs-2xs);margin-top:6px;padding:6px}.diff-added{display:block;color:var(--done-text);background:var(--done-soft)}.diff-removed{display:block;color:var(--bad-text);background:var(--bad-soft)}.submission-diff pre{padding:8px;max-height:350px;overflow:auto}.pattern-lab{padding:15px 0}.pattern-lab p{font-size:var(--fs-sm)}.pattern-lab select{width:100%;margin-bottom:20px}.trace-cells{display:flex;gap:5px;flex-wrap:wrap;margin:15px 0 22px}.trace-cells>div{width:42px;min-height:56px;border:2px solid var(--line);border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;background:var(--surface-2);font-family:var(--font-code);font-weight:700}.trace-cells .trace-active{border-color:var(--next);background:var(--next-soft);color:var(--ink)}.trace-cells .trace-done{opacity:.4}.trace-cells small{font-size:var(--fs-2xs);font-family:var(--font-body);font-weight:400}.trace-controls{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.trace-controls button{font-size:var(--fs-xs);padding:7px 9px}.nvim-config{display:flex;align-items:center;gap:7px;padding:7px 12px;color:var(--ink-3);font-size:var(--fs-2xs);border-top:1px solid var(--line)}.nvim-config input{accent-color:var(--done)}.neovim-editor{flex:1;min-height:180px;display:flex;flex-direction:column;overflow:hidden}.neovim-status{font-size:var(--fs-2xs);color:var(--ink-2);padding:7px 12px}.neovim-terminal{flex:1;min-height:0;padding:4px 8px}.neovim-terminal .xterm{height:100%}.header nav small{background:var(--surface-3);color:var(--ink);padding:1px 7px;border-radius:999px;font-size:var(--fs-2xs);font-weight:700}@media(max-width:1000px){.editor-toolbar-right{gap:2px}.editor-toolbar-right>button{padding:5px}.panel-tabs button{gap:4px}.panel-tabs svg{display:none}}@media(max-width:720px){.workspace{display:flex}.split-handle{display:none}.review-row{align-items:flex-start;flex-direction:column}.complexity{grid-template-columns:1fr}.shortcut-help{display:none}.run-bar.cold-rating>span{flex-basis:100%}.cold-review .run-bar:not(.cold-rating)>span{display:none}.nvim-config{font-size:var(--fs-2xs)}.panel-tabs button{padding:12px 8px;font-size:var(--fs-xs)}.import-preview{margin:10px}.notebook-page{width:calc(100% - 28px);padding-top:28px}.notebook-grid{grid-template-columns:1fr}.lesson-reminder{flex-direction:column}.recommendation-card{align-items:flex-start;flex-direction:column}.recommendation-actions{width:100%}.cold-review.coding{grid-template-columns:minmax(0,1fr)}.trace-cells>div{width:34px}}@media(min-width:721px){.app:has(.practice){height:100dvh;display:flex;flex-direction:column}.app:has(.practice)>.header,.app:has(.practice)>.notice{flex-shrink:0}.app:has(.practice)>.practice{height:auto;min-height:0;flex:1}.app:has(.practice)>.import-preview{flex-shrink:0}}.account-controls{display:flex;align-items:center;gap:12px}.account-status{color:var(--muted, var(--ink-3));max-width:220px;font-size:var(--fs-xs);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.account-status.offline,.account-status.conflict{color:var(--warn-text)}.account-button{border:2px solid var(--line);border-radius:var(--r-sm);padding:7px 13px;white-space:nowrap}.account-loading{min-height:100vh;display:grid;place-items:center;color:var(--ink-2)}.account-dialog{width:min(470px,calc(100vw - 32px));max-height:calc(100vh - 48px);overflow:auto;border:2px solid var(--line);border-radius:var(--r-lg);padding:32px;background:var(--surface);color:var(--ink);box-shadow:0 24px 80px var(--shade)}.account-dialog::backdrop{background:var(--scrim);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.account-dialog h2{margin:12px 0;font-size:28px;line-height:1.2}.account-dialog p{color:var(--ink-2);font-size:var(--fs-md);line-height:1.65}.account-dialog form,.account-dialog label{display:flex;flex-direction:column;gap:10px}.account-dialog label{margin-top:12px;font-size:var(--fs-base)}.account-dialog input{width:100%;box-sizing:border-box;color:var(--ink);border:2px solid var(--line);background:var(--sunken);border-radius:var(--r-sm);padding:12px;font:inherit}.account-dialog input:focus{outline:2px solid var(--focus);outline-offset:2px}.account-dialog small{color:var(--ink-3);line-height:1.5}.account-dialog button{border:2px solid var(--line);border-radius:var(--r-sm);padding:10px 14px}.account-dialog .primary{margin-top:14px;justify-content:center}.account-dialog .dialog-close{position:absolute;right:12px;top:10px;padding:3px 9px;font-size:22px;border:0}.account-dialog .account-switch{border:0;color:var(--link);font-size:var(--fs-md)}.account-dialog .account-error{color:var(--bad-text);padding:12px;background:var(--bad-soft);border-radius:7px}.account-dialog .account-notice{color:var(--info-text);padding:12px;background:var(--info-soft);border-radius:7px}.account-conflict{padding:14px 0;margin:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.account-conflict button,.account-actions button{margin:5px 6px 5px 0}.account-subscription{padding:0 0 14px;margin:14px 0;border-bottom:2px solid var(--line)}.account-subscription .primary{width:100%;margin-bottom:8px}.account-dialog .subscription-price{margin:6px 0 0;color:var(--ink);font-family:Bricolage Grotesque,sans-serif;font-size:24px;font-weight:700}.account-keel{padding:0 0 14px;margin:0 0 14px;border-bottom:2px solid var(--line)}.account-verify{padding:12px 14px;margin:14px 0;border:2px solid var(--line);border-radius:var(--r-sm);background:var(--sunken)}.account-verify h3{margin-top:0}.account-security{display:flex;flex-direction:column;align-items:flex-start;gap:10px;padding:0 0 14px;margin:0 0 14px;border-bottom:2px solid var(--line)}.account-security details{width:100%}.account-security summary{cursor:pointer;color:var(--link);font-size:var(--fs-md)}.account-security details form{margin:4px 0 10px}.account-security details button{align-self:flex-start;margin-top:6px}.account-dialog .danger{color:var(--bad-text);border-color:var(--bad-line);background:var(--bad-soft)}.keel-token code{display:block;overflow-wrap:anywhere;-webkit-user-select:all;user-select:all;margin:8px 0;padding:10px 12px;border-radius:var(--r-sm);background:var(--sunken)}.keel-tokens{list-style:none;padding:0;display:grid;gap:8px}.keel-tokens li{display:flex;justify-content:space-between;gap:12px;align-items:center}.account-email{overflow-wrap:anywhere}@media(max-width:700px){.account-status{display:none}.account-dialog{padding:25px}.account-controls{gap:4px}}.review-actions{display:flex;gap:8px;align-items:center}.teach-back-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:90;display:grid;place-items:center;padding:20px;background:var(--scrim);-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.teach-back-dialog{position:relative;width:min(850px,100%);max-height:calc(100vh - 40px);overflow:auto;padding:30px;border:2px solid var(--line);border-radius:var(--r-lg);background:var(--surface);box-shadow:0 24px 80px var(--shade)}.teach-back-dialog h2{margin:7px 0;font-size:28px}.teach-back-dialog .dialog-close{position:absolute;top:12px;right:15px;border:0;font-size:23px}.teach-back-disclaimer{color:var(--warn-text);line-height:1.5}.teach-back-fields{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin:22px 0}.teach-back-fields label{color:var(--ink-2);font-size:var(--fs-sm)}.teach-back-fields textarea{display:block;box-sizing:border-box;width:100%;min-height:96px;margin-top:7px;padding:11px;resize:vertical;border:2px solid var(--line);border-radius:var(--r-sm);color:var(--ink);background:var(--sunken);font:inherit}.teach-back-fields label:last-child{grid-column:1 / -1}.teach-back-feedback{display:flex;flex-wrap:wrap;gap:8px 18px;padding:13px;border-radius:var(--r-sm);background:var(--info-soft)}.teach-back-feedback small{width:100%;color:var(--ink-2)}.teach-back-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}.interview-practice{max-width:1100px;margin:auto;padding:34px clamp(18px,5vw,60px) 70px;--hue: var(--rose)}.interview-practice>.text-button{display:flex;align-items:center;gap:7px;margin-bottom:26px}.interview-practice>h1{font-size:clamp(32px,5vw,52px);margin:8px 0 22px}.interview-explain,.interview-code{padding:25px;border:2px solid var(--line);border-radius:var(--r-lg);background:var(--surface)}.interview-explain>p{color:var(--ink-2)}.interview-code header{display:flex;align-items:center;gap:12px;padding-bottom:16px}.interview-code header p{margin:0 auto 0 0;color:var(--ink-2)}.interview-code header button{display:flex;align-items:center;gap:6px;flex-shrink:0}.interview-code output{min-width:48px;color:var(--ink);font-variant-numeric:tabular-nums;font-family:var(--font-code);font-weight:700}.interview-editor{height:480px;border:2px solid var(--line);border-radius:var(--r-sm);overflow:hidden}.interview-actions{display:flex;justify-content:flex-end;margin-top:14px}.interview-actions button,.interview-result{display:flex;align-items:center;gap:8px}.interview-result{margin-top:14px;padding:12px;border-radius:var(--r-sm);background:var(--info-soft)}.interview-result span{color:var(--ink-2)}@media(max-width:650px){.teach-back-fields{grid-template-columns:1fr}.teach-back-fields label:last-child{grid-column:auto}.teach-back-dialog{padding:22px 16px}.review-actions{align-items:stretch;flex-direction:column}.interview-code header{align-items:flex-start;flex-wrap:wrap}.interview-code header p{width:100%}}.session-resume{border-color:var(--next-line);color:var(--next-text);font-size:var(--fs-xs);white-space:nowrap}.focused-session{max-width:1050px;margin:auto;padding:48px clamp(18px,5vw,60px) 80px;--hue: var(--rose)}.focused-session>h1,.session-topline h1{margin:8px 0;font-size:clamp(34px,5vw,52px)}.focused-session>p{color:var(--ink-2);line-height:1.6}.session-templates{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:28px}.session-templates>button{display:flex;align-items:flex-start;flex-direction:column;min-height:170px;padding:24px;text-align:left;font-weight:400;border:2px solid color-mix(in oklab,var(--hue) var(--tile-border),var(--surface));border-radius:var(--r-lg);background:var(--surface);box-shadow:0 5px color-mix(in oklab,var(--hue) var(--tile-edge),var(--bg));transition:background .15s,transform .08s,box-shadow .08s}.session-templates>button:nth-child(4n+1){--hue: var(--sky)}.session-templates>button:nth-child(4n+2){--hue: var(--leaf)}.session-templates>button:nth-child(4n+3){--hue: var(--tang)}.session-templates>button:nth-child(4n){--hue: var(--iris)}.session-templates>button:hover{border-color:var(--hue);background:color-mix(in oklab,var(--hue) 12%,var(--surface))}.session-templates>button:active{transform:translateY(4px);box-shadow:0 1px color-mix(in oklab,var(--hue) var(--tile-edge),var(--bg))}.session-templates strong{color:var(--ink);font-size:24px;font-family:var(--font-display);letter-spacing:-.015em}.session-templates span{margin:10px 0 auto;color:var(--ink-2);line-height:1.5}.session-templates small{display:flex;align-items:center;gap:7px;color:var(--ink);font-size:var(--fs-sm);font-weight:700}.session-topline{display:flex;justify-content:space-between;align-items:end;gap:20px}.session-topline button{display:flex;align-items:center;gap:7px}.session-meter{height:12px;margin:19px 0 12px;overflow:hidden;border-radius:99px;background:var(--surface-3)}.session-meter i{display:block;height:100%;background:var(--done);transition:width .18s ease}.session-duration{display:flex;align-items:center;gap:7px;color:var(--ink-3);font-size:var(--fs-md)}.session-queue{display:grid;gap:10px;margin:25px 0}.session-queue article{display:grid;grid-template-columns:36px 1fr auto;align-items:center;gap:14px;padding:18px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--surface)}.session-queue article.completed{opacity:.65}.session-number{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;font-weight:800;color:var(--next-text);background:var(--next-soft)}.session-queue article.completed .session-number{color:var(--done-text);background:var(--done-soft)}.session-queue p{margin:5px 0;color:var(--ink-2)}.session-queue small,.session-note{color:var(--ink-3)}.session-note{font-size:var(--fs-md)}@media(prefers-reduced-motion:reduce){.session-meter i{transition:none}}@media(max-width:650px){.session-templates{grid-template-columns:1fr}.session-topline{align-items:flex-start;flex-direction:column}.session-queue article{grid-template-columns:32px 1fr}.session-queue article>button{grid-column:2;justify-self:start}.session-resume{max-width:130px;overflow:hidden;text-overflow:ellipsis}}
