@font-face{font-family:Familjen Grotesk Variable;font-style:normal;font-display:swap;font-weight:400 700;src:url(/assets/familjen-grotesk-vietnamese-wght-normal-DKRsWTd7.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Familjen Grotesk Variable;font-style:normal;font-display:swap;font-weight:400 700;src:url(/assets/familjen-grotesk-latin-ext-wght-normal-Cvgdx4cy.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Familjen Grotesk Variable;font-style:normal;font-display:swap;font-weight:400 700;src:url(/assets/familjen-grotesk-latin-wght-normal-CfZa4wxB.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(data:font/woff2;base64,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) format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(/assets/jetbrains-mono-cyrillic-wght-normal-D73BlboJ.woff2) format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(/assets/jetbrains-mono-greek-wght-normal-Bw9x6K1M.woff2) format("woff2-variations");unicode-range:U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(/assets/jetbrains-mono-vietnamese-wght-normal-Bt-aOZkq.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(/assets/jetbrains-mono-latin-ext-wght-normal-DBQx-q_a.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:JetBrains Mono Variable;font-style:normal;font-display:swap;font-weight:100 800;src:url(/assets/jetbrains-mono-latin-wght-normal-B9CIFXIH.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{font-family:Familjen Grotesk Variable,sans-serif;color:#111827;background:#f4f7fb;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #101726;--muted: #5d6878;--line: #cfd7e3;--line-dark: #aeb8c7;--paper: #ffffff;--field: #f4f7fb;--cobalt: #3157ff;--cobalt-dark: #193bd6;--cobalt-pale: #e9edff;--green: #137a4b;--green-pale: #e4f6ed;--red: #bd2e3b;--red-pale: #fff0f1;--cyan: #d9f4f6;--radius: 12px;--mono: "JetBrains Mono Variable", monospace}*{box-sizing:border-box}html{min-width:320px;background:var(--field)}body{margin:0;min-width:320px;min-height:100vh}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a,button{color:inherit}:focus-visible{outline:3px solid #8da3ff;outline-offset:3px}::selection{background:#bfcaff;color:var(--ink)}.route-loading{min-height:100vh;display:flex;align-items:center;justify-content:center;gap:11px;color:var(--muted);font-weight:650}.route-loading span{width:10px;height:10px;border:2px solid var(--cobalt);border-radius:3px;animation:route-pulse .8s cubic-bezier(.16,1,.3,1) infinite alternate}@keyframes route-pulse{to{transform:translate(8px) rotate(90deg);background:var(--cobalt)}}.app-shell{min-height:100vh}.masthead{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 clamp(20px,4vw,64px);border-bottom:1px solid var(--line);background:#f4f7fbf5;position:sticky;top:0;z-index:20}.brand{display:inline-flex;align-items:center;gap:11px;width:fit-content;text-decoration:none;font-weight:750;font-size:18px;letter-spacing:-.02em}.brand-mark{width:25px;height:22px;display:inline-flex;align-items:center;gap:3px}.brand-mark i{width:6px;height:6px;display:block;border:2px solid var(--ink);background:var(--paper)}.brand-mark i:nth-child(2){background:var(--cobalt);border-color:var(--cobalt)}.brand-mark:before,.brand-mark:after{content:"";position:absolute}.masthead nav{display:flex;align-items:center;gap:4px}.masthead nav a{display:inline-flex;align-items:center;gap:7px;padding:9px 13px;border-radius:8px;text-decoration:none;color:var(--muted);font-weight:650;font-size:14px}.masthead nav a:hover{color:var(--ink);background:#e9eef5}.masthead nav a.active{color:var(--ink);background:var(--paper);box-shadow:0 4px 16px #212e4614}.text-button{justify-self:end;border:0;background:transparent;padding:9px;display:inline-flex;align-items:center;gap:7px;color:var(--muted);cursor:pointer;font-size:13px;font-weight:650}.text-button:hover{color:var(--ink)}.text-button--danger{color:var(--red)}.storage-notice{padding:9px 24px;text-align:center;font-size:13px;background:var(--red-pale);color:#82212c;border-bottom:1px solid #edb8bd}.site-footer{display:grid;grid-template-columns:auto minmax(0,720px);justify-content:space-between;align-items:start;gap:40px;padding:30px clamp(20px,4vw,64px);border-top:1px solid var(--line);background:var(--paper);color:var(--muted)}.site-footer__identity{display:flex;flex-direction:column;gap:8px;font-size:11px;line-height:1.4}.site-footer code{color:var(--ink);font-family:var(--mono);font-size:11px}.site-footer__identity a{color:var(--ink);font-weight:650;text-underline-offset:3px}.site-footer__identity a:hover{color:var(--cobalt-dark)}.site-footer p{margin:0;font-size:12px;line-height:1.55}.share-button{min-height:38px;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:0 12px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--muted);font-size:12px;font-weight:700;cursor:pointer;white-space:nowrap}.share-button:hover{border-color:var(--line-dark);color:var(--ink);background:#f9fbfe}.home-hero{min-height:620px;display:grid;grid-template-columns:minmax(0,.86fr) minmax(520px,1.14fr);align-items:center;gap:clamp(54px,7vw,110px);max-width:1440px;margin:0 auto;padding:88px clamp(24px,5vw,80px) 96px;overflow:hidden}.hero-copy h1{margin:0;max-width:690px;color:var(--ink);font-size:clamp(52px,6vw,88px);line-height:.92;letter-spacing:-.04em;font-weight:730;text-wrap:balance}.hero-copy h1 span{color:var(--cobalt)}.hero-copy>p{margin:32px 0 0;max-width:600px;font-size:clamp(18px,1.45vw,22px);line-height:1.52;color:#4a5668}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px}.primary-button,.secondary-button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:0 18px;border-radius:10px;text-decoration:none;border:1px solid transparent;font-weight:720;cursor:pointer}.primary-button{background:var(--cobalt);color:#fff;box-shadow:0 8px 22px #3157ff38}.primary-button:hover{background:var(--cobalt-dark);transform:translateY(-1px)}.secondary-button{background:var(--paper);border-color:var(--line);color:var(--ink)}.secondary-button:hover{border-color:var(--line-dark);background:#f9fbfe}.secondary-button--small{min-height:38px;padding:0 13px;font-size:13px}.course-entry-note{max-width:540px;margin:18px 0 0;color:var(--muted);font-size:14px;line-height:1.5}.course-entry-note strong{color:var(--ink)}.course-entry-note a{margin-left:7px;display:inline-flex;align-items:center;gap:5px;color:var(--cobalt-dark);font-weight:680;text-underline-offset:3px}.course-entry-note+.course-progress{margin-top:38px}.course-progress{margin-top:54px;max-width:460px}.progress-copy{display:flex;justify-content:space-between;margin-bottom:9px;color:var(--muted);font-size:13px;font-weight:650}.progress-track{height:4px;background:#dbe1ea;overflow:hidden}.progress-track span{display:block;height:100%;background:var(--cobalt)}.pipeline-diagram{min-height:430px;position:relative;display:grid;grid-template-columns:repeat(4,minmax(105px,1fr));align-items:center;gap:20px;padding:44px 0}.pipeline-axis{position:absolute;left:3%;right:3%;top:50%;height:1px;background:var(--line-dark)}.diagram-stage{min-height:150px;background:var(--paper);border:1px solid var(--line-dark);border-radius:var(--radius);display:flex;flex-direction:column;justify-content:space-between;padding:17px;position:relative;box-shadow:0 14px 35px #202c4314;transform:translateY(var(--offset, 0))}.diagram-stage--0{--offset: -38px}.diagram-stage--1{--offset: 28px;border-color:#9babff}.diagram-stage--2{--offset: -12px;border-color:#6f86f7}.diagram-stage--3{--offset: 35px;background:var(--green-pale);border-color:#8ac5a5}.diagram-index{font-family:var(--mono);font-size:11px;color:var(--muted)}.diagram-stage strong{font-family:var(--mono);font-size:clamp(14px,1.2vw,18px);letter-spacing:-.03em}.diagram-stage small{color:var(--muted);font-size:12px}.diagram-stage--3 small{color:var(--green);font-weight:700}.diagram-arrow{position:absolute;right:-30px;top:calc(50% - 9px);z-index:2;color:var(--cobalt)}.diagram-stage:last-child .diagram-arrow{display:none}.curriculum-section{background:var(--paper);border-top:1px solid var(--line);padding:96px clamp(24px,5vw,80px) 110px}.section-heading{max-width:1240px;margin:0 auto 55px;display:flex;justify-content:space-between;align-items:end;gap:30px}.section-heading h2,.mastery-section h2{margin:0;color:var(--ink);font-size:clamp(34px,4vw,55px);letter-spacing:-.035em;line-height:1}.section-heading p{margin:0;max-width:420px;color:var(--muted);font-size:17px;line-height:1.5}.course-primer{min-height:92px;max-width:1240px;margin:0 auto 34px;display:grid;grid-template-columns:44px minmax(280px,1fr) auto auto;align-items:center;gap:22px;padding:14px 20px 14px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);color:var(--ink);text-decoration:none}.course-primer:hover{background:#f6f8fc}.course-primer-index{align-self:stretch;display:grid;place-items:center;background:var(--cobalt);color:#fff;font-family:var(--mono);font-size:11px}.course-primer-copy strong,.course-primer-copy small{display:block}.course-primer-copy strong{font-size:19px}.course-primer-copy small{margin-top:5px;color:var(--muted);font-size:13px;line-height:1.4}.course-primer>code{font-family:var(--mono);color:var(--muted);font-size:10px}.course-primer-action{display:inline-flex;align-items:center;gap:8px;color:var(--cobalt);font-size:13px;font-weight:720}.course-primer:hover .course-primer-action svg{transform:translate(3px)}.course-primer-action svg{transition:transform .18s ease}.module-stack{max-width:1240px;margin:auto;border-bottom:1px solid var(--ink)}.module-band{display:grid;grid-template-columns:.78fr 1.22fr;border-top:1px solid var(--ink)}.module-meta{min-height:228px;padding:28px 30px 28px 0;display:grid;grid-template-columns:44px 1fr auto;grid-template-rows:1fr auto;gap:14px;align-items:start;border-right:1px solid var(--line)}.module-number{font-family:var(--mono);font-size:12px;color:var(--cobalt);font-weight:700}.module-meta h3{margin:-5px 0 8px;font-size:29px;letter-spacing:-.025em}.module-copy{max-width:390px}.module-meta .module-summary{margin:0;color:var(--ink);font-weight:650;line-height:1.45}.module-meta .module-introduction{margin:13px 0 0;color:var(--muted);font-size:14px;line-height:1.58}.module-meta code{font-family:var(--mono);font-size:11px;color:var(--muted);background:var(--field);padding:6px 8px;border-radius:5px}.module-count{grid-column:2;align-self:end;font-family:var(--mono);font-size:12px;color:var(--muted)}.challenge-list{list-style:none;margin:0;padding:0}.challenge-list li+li{border-top:1px solid var(--line)}.challenge-list a{min-height:76px;display:grid;grid-template-columns:36px 1fr auto;align-items:center;gap:16px;padding:12px 0 12px 28px;text-decoration:none}.challenge-list a:hover{background:#f6f8fc}.challenge-list a:hover>svg{transform:translate(4px);color:var(--cobalt)}.challenge-list a>svg{margin-right:20px;transition:transform .18s ease}.challenge-state{width:28px;height:28px;display:grid;place-items:center;font-family:var(--mono);font-size:10px;border:1px solid var(--line-dark);border-radius:7px;color:var(--muted)}.challenge-state--done{background:var(--green);color:#fff;border-color:var(--green)}.challenge-list strong{display:block;font-size:16px}.challenge-list small{display:block;margin-top:4px;color:var(--muted);font-family:var(--mono);font-size:10px}.hard-mode-section{max-width:1240px;margin:74px auto 0;background:var(--ink);color:#fff}.hard-mode-section>header{min-height:150px;display:flex;align-items:end;justify-content:space-between;gap:42px;padding:34px 38px;border-bottom:1px solid #3f4a5e}.hard-mode-section h2{margin:0;color:#fff;font-size:clamp(42px,5vw,66px);line-height:.95;letter-spacing:-.04em}.hard-mode-section header p{margin:16px 0 0;max-width:690px;color:#c0c9d8;font-size:16px;line-height:1.55}.hard-mode-section header code{flex:0 0 auto;padding-bottom:4px;color:#aebbd0;font-family:var(--mono);font-size:10px}.hard-mode-challenge{min-height:112px;display:grid;grid-template-columns:64px minmax(270px,1.15fr) minmax(260px,.85fr) auto;align-items:center;gap:26px;padding:22px 38px;color:#fff;text-decoration:none}.hard-mode-challenge:hover{background:#182238}.hard-mode-order{width:56px;height:56px;display:grid;place-items:center;background:var(--cobalt);color:#fff;font-family:var(--mono);font-size:18px}.hard-mode-order--done{background:var(--green)}.hard-mode-copy strong,.hard-mode-copy small{display:block}.hard-mode-copy strong{font-size:20px;letter-spacing:-.015em}.hard-mode-copy small{margin-top:6px;color:#c0c9d8;font-size:13px}.hard-mode-branches{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto;align-items:center;gap:7px;color:#aebbd0;font-family:var(--mono);font-size:9px}.hard-mode-branches i{height:1px;background:#6c7b96;position:relative}.hard-mode-branches i:after{content:"";width:5px;height:5px;position:absolute;right:0;top:-2px;background:var(--cobalt)}.hard-mode-action{display:inline-flex;align-items:center;gap:9px;color:#fff;font-size:13px;font-weight:720;white-space:nowrap}.hard-mode-challenge:hover .hard-mode-action svg{transform:translate(4px)}.hard-mode-action svg{transition:transform .18s ease}.mastery-section{padding:84px clamp(24px,5vw,80px) 100px;background:var(--field);border-top:1px solid var(--line)}.mastery-inner{max-width:1240px;margin:auto}.mastery-section>.mastery-inner>header{display:grid;grid-template-columns:minmax(320px,.8fr) minmax(420px,1.2fr);align-items:end;gap:clamp(48px,8vw,120px);padding-bottom:42px;border-bottom:1px solid var(--ink)}.mastery-section header p{margin:0;max-width:720px;color:var(--muted);font-size:18px;line-height:1.55}.mastery-section header code{display:block;margin-top:18px;color:var(--cobalt-dark);font-family:var(--mono);font-size:10px}.mastery-list{margin:0;padding:0;list-style:none;border-bottom:1px solid var(--ink)}.mastery-list li+li{border-top:1px solid var(--line)}.mastery-list a{min-height:94px;display:grid;grid-template-columns:56px minmax(270px,1fr) minmax(260px,.85fr) auto;align-items:center;gap:24px;padding:14px 18px 14px 0;color:var(--ink);text-decoration:none}.mastery-list a:hover{background:var(--paper)}.mastery-order{width:46px;height:46px;display:grid;place-items:center;border:1px solid var(--cobalt);color:var(--cobalt);font-family:var(--mono);font-size:13px}.mastery-order--done{background:var(--green);border-color:var(--green);color:#fff}.mastery-copy strong,.mastery-copy small{display:block}.mastery-copy strong{font-size:18px;letter-spacing:-.015em}.mastery-copy small{margin-top:5px;color:var(--muted);font-size:13px}.mastery-list a>code{color:#465264;font-family:var(--mono);font-size:10px}.mastery-action{display:inline-flex;align-items:center;gap:8px;color:var(--cobalt-dark);font-size:12px;font-weight:720;white-space:nowrap}.mastery-list a:hover .mastery-action svg{transform:translate(4px)}.mastery-action svg{transition:transform .18s ease}.app-shell--compact .masthead{height:58px}.challenge-workspace{padding:24px;max-width:1900px;margin:auto}.workspace-heading{min-height:88px;display:flex;align-items:end;justify-content:space-between;margin-bottom:18px}.workspace-heading-actions{display:flex;align-items:center;gap:18px}.back-link{display:inline-flex;align-items:center;gap:5px;color:var(--muted);text-decoration:none;font-size:13px;font-weight:650;margin-bottom:8px}.back-link:hover{color:var(--cobalt)}.workspace-heading h1{margin:0;font-size:clamp(30px,3vw,46px);line-height:1;letter-spacing:-.035em}.back-link span{font-family:var(--mono);font-size:10px;color:var(--cobalt)}.runner-disclosure{display:flex;align-items:center;gap:7px;margin-top:9px;color:var(--muted);font-size:11px}.runner-disclosure span{width:7px;height:7px;border-radius:2px;background:var(--green)}.stage-readout{display:grid;grid-template-columns:auto auto;align-items:center;gap:10px;padding-bottom:4px}.stage-readout span{font-family:var(--mono);font-size:38px;color:var(--cobalt)}.stage-readout small{max-width:80px;color:var(--muted);line-height:1.2}.challenge-workspace--hard .difficulty-line>span{margin-right:7px;padding:5px 7px;background:var(--ink);color:#fff;font-family:var(--mono);font-size:10px}.challenge-workspace--beyond{background:#f1f4ff}.challenge-workspace--beyond .workspace-grid{border-color:var(--cobalt)}.challenge-workspace--beyond .difficulty-line>span{margin-right:7px;padding:5px 7px;background:var(--cobalt);color:#fff;font-family:var(--mono);font-size:10px}.challenge-workspace--hard .workspace-grid{border-color:var(--ink)}.workspace-grid{height:calc(100vh - 188px);min-height:610px;display:grid;grid-template-columns:minmax(250px,.72fr) minmax(430px,1.35fr) minmax(330px,.93fr);grid-template-rows:minmax(270px,.82fr) minmax(270px,1.18fr);border:1px solid var(--line-dark);background:var(--paper);box-shadow:0 16px 45px #212f4917;overflow:hidden}.lesson-panel{grid-row:1 / 3;border-right:1px solid var(--line-dark);padding:25px;overflow-y:auto}.editor-panel{grid-row:1 / 3;border-right:1px solid var(--line-dark);display:grid;grid-template-rows:46px 1fr 56px;min-width:0}.data-panel{border-bottom:1px solid var(--line-dark);display:grid;grid-template-rows:46px 1fr auto;min-height:0}.results-panel{display:flex;flex-direction:column;min-height:0;overflow:auto}.difficulty-line{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:26px}.difficulty-line>span{color:var(--cobalt);font-weight:750;font-size:12px;margin-right:5px}.difficulty-line a{font-family:var(--mono);font-size:10px;padding:4px 6px;background:var(--cobalt-pale);color:#263ca6;border-radius:4px;text-decoration:none}.difficulty-line a:hover{background:#dce3ff;color:var(--cobalt-dark)}.lesson-prerequisite{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;margin:-7px 0 24px;padding:13px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none}.lesson-prerequisite>svg:first-child{color:var(--cobalt)}.lesson-prerequisite>svg:last-child{color:var(--muted)}.lesson-prerequisite strong,.lesson-prerequisite small{display:block}.lesson-prerequisite strong{font-size:13px}.lesson-prerequisite small{margin-top:3px;color:var(--muted);font-size:11px}.lesson-prerequisite:hover strong,.lesson-prerequisite:hover>svg:last-child{color:var(--cobalt)}.lesson-copy{font-size:16px;line-height:1.58;margin:0 0 28px;color:#3e4a5c}.task-block{display:grid;grid-template-columns:auto 1fr;gap:12px;padding:17px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}.task-block svg{color:var(--cobalt);margin-top:2px}.task-block h2{margin:0 0 7px;font-size:15px}.task-block p,.expected-block p{margin:0;color:#465264;line-height:1.5;font-size:14px}.expected-block{padding:18px 0;border-bottom:1px solid var(--line)}.expected-block strong{display:block;margin-bottom:6px;font-size:12px}.hints-block{padding:20px 0}.hints-heading{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;margin-bottom:12px}.hints-heading svg{color:#9a6c00}.hints-heading strong{font-size:13px}.hints-heading>span{font-family:var(--mono);font-size:10px;color:var(--muted)}.hints-block>p{display:grid;grid-template-columns:27px 1fr;gap:8px;margin:9px 0;font-size:13px;line-height:1.45;color:#465264}.hints-block>p span{font-family:var(--mono);font-size:9px;color:var(--cobalt);padding-top:3px}.lesson-nav{display:flex;justify-content:space-between;gap:10px;margin-top:20px}.lesson-nav button{border:0;background:transparent;color:var(--muted);display:inline-flex;align-items:center;gap:5px;cursor:pointer;font-size:12px;font-weight:650;padding:8px 0}.lesson-nav button:disabled{opacity:.35;cursor:default}.lesson-nav button:not(:disabled):hover{color:var(--cobalt)}.panel-bar{height:46px;flex:0 0 46px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line);background:#f7f9fc}.panel-bar>div{display:flex;align-items:center;gap:8px}.panel-bar h2{margin:0;font-size:12px;font-weight:750}.panel-bar span{color:var(--muted);font-family:var(--mono);font-size:12px}.panel-bar button{border:0;background:transparent;display:inline-flex;align-items:center;gap:5px;padding:7px 8px;border-radius:6px;color:var(--muted);font-size:11px;font-weight:650;cursor:pointer}.panel-bar button:hover{color:var(--ink);background:#e9eef5}.panel-bar select{border:1px solid var(--line);background:#fff;border-radius:6px;padding:5px 28px 5px 8px;font-size:11px;color:var(--ink)}.status-dot{width:7px;height:7px;background:var(--cobalt);border-radius:2px}.code-editor{height:100%;min-height:0;overflow:auto;background:#fff}.code-editor .cm-editor{height:100%;font-family:var(--mono);font-size:13px}.code-editor .cm-scroller{overflow:auto;padding:12px 0}.code-editor .cm-gutters{background:#fbfcfe;border-right:1px solid #e4e9f0;color:#9ba5b4}.code-editor .cm-activeLine,.code-editor .cm-activeLineGutter{background:#f2f5ff}.code-editor .cm-focused{outline:none}.editor-footer{display:flex;justify-content:space-between;align-items:center;padding:0 14px;border-top:1px solid var(--line);background:#f7f9fc}.editor-footer>span{font-family:var(--mono);font-size:12px;color:var(--muted)}.run-button{border:0;min-height:38px;padding:0 13px;border-radius:8px;background:var(--cobalt);color:#fff;display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:750;cursor:pointer;box-shadow:0 6px 16px #3157ff33}.run-button:hover{background:var(--cobalt-dark)}.run-button:disabled{opacity:.75;cursor:wait}.run-button kbd{border-left:1px solid rgba(255,255,255,.35);padding-left:8px;font-family:var(--mono);font-size:8px;font-weight:500}.runner{width:13px;height:13px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}.runner--dark{width:22px;height:22px;border-color:#c5cede;border-top-color:var(--cobalt)}.result-running{gap:5px}.result-running .runner{margin:0 auto 12px}@keyframes spin{to{transform:rotate(360deg)}}.json-view{margin:0;padding:18px;font-family:var(--mono);font-size:12px;line-height:1.68;overflow:auto;min-height:0;white-space:pre-wrap;color:#334056;-moz-tab-size:2;tab-size:2}.data-panel .json-view{background:#fbfcfe}.data-note{padding:10px 14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.empty-output{min-height:180px;flex:1;display:grid;place-content:center;text-align:center;color:var(--muted);padding:24px}.empty-output span{font-family:var(--mono);font-size:25px;color:#aab4c2}.empty-output p{margin:10px auto 0;max-width:270px;font-size:13px;line-height:1.45}.result-idle{flex:1;display:grid;place-content:center;text-align:center;padding:30px}.result-symbol{display:flex;justify-content:center;margin-bottom:14px;color:#aab5c5}.result-symbol svg{margin-left:-11px}.result-idle h3{margin:0 0 7px;font-size:15px}.result-idle p{margin:0;color:var(--muted);font-size:12px}.result-error{display:flex;gap:12px;margin:15px;padding:14px;border:1px solid #edb4ba;border-radius:10px;background:var(--red-pale);color:#7c202a}.result-error h3{margin:0 0 5px;font-size:14px}.result-error p{margin:0;font-family:var(--mono);font-size:10px;line-height:1.55}.result-banner{display:grid;grid-template-columns:auto 1fr;gap:11px;margin:14px;padding:13px;background:#f5f7fa;border-radius:10px}.result-banner>span{width:30px;height:30px;display:grid;place-items:center;background:#e5e9ef;border-radius:8px;color:var(--muted)}.result-banner--pass{background:var(--green-pale)}.result-banner--pass>span{background:var(--green);color:#fff}.result-banner h3{margin:0 0 4px;font-size:14px}.result-banner p{margin:0;font-size:11px;line-height:1.4;color:var(--muted)}.assertion-list{margin:0 14px 10px;border-top:1px solid var(--line)}.assertion{min-height:48px;display:grid;grid-template-columns:24px 1fr;align-items:center;gap:7px;border-bottom:1px solid var(--line)}.assertion>span{width:18px;height:18px;display:grid;place-items:center;border-radius:5px;background:#e8ebf0;color:#667181;font-size:14px}.assertion--pass>span{color:#fff;background:var(--green)}.assertion strong,.assertion small{display:block}.assertion strong{font-size:11px}.assertion small{margin-top:3px;color:var(--muted);font-size:12px;line-height:1.35}.output-heading{display:flex;justify-content:space-between;padding:10px 14px 0;border-top:1px solid var(--line)}.output-heading strong{font-size:11px}.output-heading span{font-family:var(--mono);font-size:11px;color:var(--muted)}.results-panel .json-view{flex:none;max-height:300px}.next-action{margin:10px 14px 14px;padding:11px 13px;display:flex;align-items:center;justify-content:space-between;border-radius:8px;color:#fff;background:var(--green);text-decoration:none;font-size:12px;font-weight:700}.mobile-tabs{display:none}.playground-page{padding:32px clamp(20px,4vw,56px);max-width:1750px;margin:auto}.playground-heading{min-height:100px;display:flex;align-items:center;justify-content:space-between;gap:30px}.playground-heading>div:first-child{display:flex;align-items:center;gap:14px}.playground-heading>div:first-child>svg{color:var(--cobalt)}.playground-heading h1{margin:0;font-size:38px;letter-spacing:-.035em}.playground-heading p{margin:6px 0 0;color:var(--muted)}.simulator-note{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.simulator-note span{width:8px;height:8px;background:var(--green);border-radius:3px}.playground-grid{height:calc(100vh - 220px);min-height:620px;display:grid;grid-template-columns:1.2fr .8fr;grid-template-rows:1fr 1fr;border:1px solid var(--line-dark);background:#fff;box-shadow:0 16px 45px #212f4917}.play-editor{grid-row:1 / 3;border-right:1px solid var(--line-dark);display:grid;grid-template-rows:46px 1fr 56px;min-height:0}.play-data{border-bottom:1px solid var(--line-dark);display:grid;grid-template-rows:46px 1fr;min-height:0}.play-results{display:flex;flex-direction:column;min-height:0;overflow:auto}.operators-page{background:var(--paper)}.operators-hero{min-height:530px;display:grid;grid-template-columns:minmax(0,1fr) minmax(450px,.78fr);align-items:center;gap:clamp(54px,8vw,120px);max-width:1320px;margin:auto;padding:84px clamp(24px,5vw,80px) 90px}.operators-hero-copy h1{margin:0;max-width:720px;color:var(--ink);font-size:clamp(52px,5.6vw,82px);line-height:.94;letter-spacing:-.04em;text-wrap:balance}.operators-hero-copy h1 span{color:var(--cobalt)}.operators-hero-copy>p{max-width:660px;margin:28px 0 0;color:#4a5668;font-size:20px;line-height:1.55}.operators-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px}.pipeline-anatomy{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:22px 0 24px}.pipeline-anatomy-heading{display:flex;align-items:center;gap:9px;margin-bottom:20px}.pipeline-anatomy-heading svg{color:var(--cobalt)}.pipeline-anatomy-heading strong{font-size:16px}.pipeline-anatomy pre{margin:0;padding:22px;overflow-x:auto;background:var(--field);color:var(--ink);font-family:var(--mono);font-size:13px;line-height:1.7}.pipeline-anatomy-flow{display:grid;grid-template-columns:auto 1fr 1fr 1fr auto;align-items:center;gap:7px;margin:15px 0;color:var(--muted);font-family:var(--mono);font-size:9px}.pipeline-anatomy-flow i{height:1px;background:var(--line-dark);position:relative}.pipeline-anatomy-flow i:after{content:"";width:5px;height:5px;position:absolute;right:-1px;top:-2px;background:var(--cobalt);border-radius:1px}.pipeline-anatomy>p{margin:0;max-width:58ch;color:var(--muted);font-size:14px;line-height:1.55}.operators-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:clamp(54px,7vw,100px);max-width:1320px;margin:auto;padding:72px clamp(24px,5vw,80px) 120px;border-top:1px solid var(--line)}.operators-index{align-self:start;position:sticky;top:96px}.operators-index h2{margin:0 0 18px;font-size:24px;letter-spacing:-.025em}.operators-index dl{margin:0 0 32px}.operators-index dl>div{padding:12px 0;border-top:1px solid var(--line)}.operators-index dt{margin-bottom:6px}.operators-index code{font-family:var(--mono);font-size:11px;color:var(--cobalt-dark)}.operators-index dd{margin:0;color:var(--muted);font-size:13px;line-height:1.45}.operators-index nav{border-top:1px solid var(--ink)}.operators-index nav a{min-height:45px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);color:var(--ink);font-size:13px;font-weight:680;text-decoration:none}.operators-index nav a:hover span{color:var(--cobalt)}.operators-index nav code{color:var(--muted)}.operators-compatibility{margin:24px 0 0;color:var(--muted);font-size:12px;line-height:1.5}.operators-reference{min-width:0}.operator-section{scroll-margin-top:94px}.operator-section+.operator-section{margin-top:88px}.operator-section>header{display:grid;grid-template-columns:minmax(240px,.7fr) minmax(300px,1fr);gap:40px;align-items:end;margin-bottom:30px}.operator-section>header h2{margin:0;color:var(--ink);font-size:clamp(34px,4vw,52px);line-height:1;letter-spacing:-.035em}.operator-section>header p{margin:0;max-width:62ch;color:var(--muted);font-size:16px;line-height:1.55}.operator-list{border-bottom:1px solid var(--ink)}.operator-entry{scroll-margin-top:90px;display:grid;grid-template-columns:minmax(260px,.82fr) minmax(330px,1.18fr);gap:44px;padding:31px 0;border-top:1px solid var(--ink);transition:background-color .5s cubic-bezier(.16,1,.3,1)}.operator-entry:target{background:linear-gradient(90deg,var(--cobalt-pale),transparent 62%)}.operator-title-line{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:15px}.operator-title-line h3{margin:0}.operator-title-line h3 a{text-decoration:none}.operator-title-line h3 code{font-family:var(--mono);color:var(--cobalt);font-size:23px;letter-spacing:-.03em}.operator-title-line h3 a:hover code{color:var(--cobalt-dark);text-decoration:underline;text-underline-offset:5px}.operator-title-line a{flex:0 0 auto;display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:11px;font-weight:650;text-underline-offset:3px}.operator-title-line a:hover{color:var(--cobalt)}.operator-explanation>strong{display:block;font-size:16px;line-height:1.35}.operator-explanation>p{margin:9px 0 18px;color:var(--muted);font-size:14px;line-height:1.58}.operator-explanation>small{color:var(--cobalt-dark);font-family:var(--mono);font-size:10px}.operator-syntax{align-self:center;margin:0;min-width:0;padding:20px;overflow-x:auto;background:var(--field);border:1px solid var(--line);border-radius:8px;color:var(--ink);font-family:var(--mono);font-size:12px;line-height:1.65;white-space:pre}.operator-detail-page{max-width:1240px;margin:auto;padding:70px clamp(24px,5vw,80px) 110px}.operator-detail-hero{min-height:340px;display:flex;align-items:end;justify-content:space-between;gap:40px;padding-bottom:52px;border-bottom:1px solid var(--ink)}.operator-detail-hero>div{min-width:0}.operator-detail-hero h1{margin:20px 0 0;color:var(--ink);font-size:clamp(52px,6vw,82px);line-height:.95;letter-spacing:-.04em}.operator-detail-hero h1 code{color:var(--cobalt);font-family:var(--mono);font-size:.72em;letter-spacing:-.045em;overflow-wrap:anywhere}.operator-detail-hero p{max-width:720px;margin:28px 0 0;color:#4a5668;font-size:20px;line-height:1.52}.operator-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:clamp(54px,8vw,110px);padding:70px 0 80px}.operator-detail-article{min-width:0}.operator-detail-article>section+section{margin-top:72px}.operator-detail-article h2{margin:0 0 22px;color:var(--ink);font-size:clamp(30px,3.2vw,43px);line-height:1.05;letter-spacing:-.03em}.operator-detail-article p{max-width:70ch;margin:0;color:var(--muted);font-size:17px;line-height:1.65}.operator-detail-article p+p{margin-top:17px}.operator-detail-section-heading{display:flex;align-items:end;justify-content:space-between;gap:28px}.operator-detail-section-heading a{flex:0 0 auto;display:inline-flex;align-items:center;gap:6px;margin-bottom:24px;color:var(--cobalt-dark);font-size:12px;font-weight:700;text-underline-offset:3px}.operator-detail-code{margin:0;padding:25px;overflow-x:auto;border:1px solid var(--line-dark);background:var(--paper);color:var(--ink);font-family:var(--mono);font-size:14px;line-height:1.7;white-space:pre;box-shadow:0 16px 45px #212f4917}.operator-practice-list{margin:28px 0 0;padding:0;list-style:none;border-bottom:1px solid var(--ink)}.operator-practice-list li{border-top:1px solid var(--ink)}.operator-practice-list a{min-height:92px;display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:20px;color:var(--ink);text-decoration:none}.operator-practice-list a>span:first-child{color:var(--cobalt);font-family:var(--mono);font-size:11px}.operator-practice-list strong,.operator-practice-list small{display:block}.operator-practice-list small{margin-top:6px;color:var(--muted);font-size:12px;line-height:1.45}.operator-practice-list a:hover{background:#f6f8fc}.operator-practice-list a:hover>svg{transform:translate(3px)}.operator-practice-list svg{transition:transform .18s ease}.operator-detail-aside{align-self:start;position:sticky;top:96px;border-top:1px solid var(--ink)}.operator-detail-aside>div{padding:18px 0;border-bottom:1px solid var(--line)}.operator-detail-aside span,.operator-detail-aside strong{display:block}.operator-detail-aside span{color:var(--muted);font-family:var(--mono);font-size:10px}.operator-detail-aside strong{margin-top:7px;font-size:14px;line-height:1.4}.operator-detail-aside .secondary-button{width:100%;margin-top:24px;font-size:13px}.operator-sequence{min-height:112px;display:grid;grid-template-columns:1fr 1fr;gap:30px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.operator-sequence a{display:flex;align-items:center;gap:14px;color:var(--ink);text-decoration:none}.operator-sequence a:last-child{justify-content:end;text-align:right}.operator-sequence small,.operator-sequence strong{display:block}.operator-sequence small{color:var(--muted);font-family:var(--mono);font-size:10px}.operator-sequence strong{margin-top:6px;color:var(--cobalt);font-family:var(--mono);font-size:14px}.operator-sequence a:hover strong{color:var(--cobalt-dark)}.about-page{background:var(--paper)}.about-hero{min-height:610px;display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,.7fr);align-items:center;gap:clamp(60px,9vw,140px);max-width:1320px;margin:auto;padding:80px clamp(24px,5vw,80px) 92px}.about-hero h1{max-width:720px;margin:0;color:var(--ink);font-size:clamp(52px,6vw,88px);line-height:.92;letter-spacing:-.04em}.about-hero h1 span{color:var(--cobalt)}.about-hero p{max-width:680px;margin:30px 0 0;color:#4a5668;font-size:20px;line-height:1.55}.about-route{display:grid;grid-template-columns:auto 1fr auto 1fr auto 1fr auto;align-items:center;gap:9px;color:var(--muted);font-family:var(--mono);font-size:10px}.about-route i{height:1px;background:var(--line-dark);position:relative}.about-route i:after{content:"";width:6px;height:6px;position:absolute;right:-1px;top:-2px;border-radius:2px;background:var(--cobalt)}.about-methodology{padding:94px clamp(24px,5vw,80px) 108px;border-top:1px solid var(--line);background:var(--field)}.about-methodology>header,.methodology-list,.about-trust,.about-actions{max-width:1240px;margin-inline:auto}.about-methodology>header{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(360px,1fr);gap:70px;align-items:end;margin-bottom:52px}.about-methodology h2,.about-trust h2{margin:0;color:var(--ink);font-size:clamp(34px,4vw,52px);line-height:1;letter-spacing:-.035em}.about-methodology>header p{margin:0;color:var(--muted);font-size:17px;line-height:1.58}.methodology-list{border-bottom:1px solid var(--ink)}.methodology-list article{min-height:126px;display:grid;grid-template-columns:42px 32px minmax(0,1fr);gap:22px;align-items:start;padding:28px 0;border-top:1px solid var(--ink)}.methodology-list article>span{color:var(--cobalt);font-family:var(--mono);font-size:11px}.methodology-list article>svg{color:var(--cobalt)}.methodology-list h3{margin:-4px 0 8px;font-size:23px;letter-spacing:-.025em}.methodology-list p{max-width:72ch;margin:0;color:var(--muted);font-size:15px;line-height:1.58}.about-trust{display:grid;grid-template-columns:1fr 1fr;gap:80px;padding-block:98px}.about-trust>div{border-top:1px solid var(--ink);padding-top:26px}.about-trust h2{font-size:34px}.about-trust p{margin:20px 0 0;color:var(--muted);font-size:16px;line-height:1.62}.about-actions{min-height:128px;display:flex;align-items:center;justify-content:space-between;gap:30px;padding:26px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.about-actions>div{display:flex;align-items:center;gap:16px}.about-actions>div>svg{color:var(--cobalt)}.about-actions strong,.about-actions small{display:block}.about-actions small{margin-top:5px;color:var(--muted);font-size:13px}.not-found-page{min-height:calc(100vh - 68px);display:grid;place-content:center;justify-items:center;padding:80px 24px 120px;text-align:center}.not-found-code{width:min(520px,82vw);display:grid;grid-template-columns:auto 1fr auto 1fr auto;align-items:center;gap:12px;color:var(--cobalt);font-family:var(--mono);font-size:13px}.not-found-code i{height:1px;background:var(--line-dark)}.not-found-page h1{max-width:760px;margin:35px 0 0;color:var(--ink);font-size:clamp(44px,6vw,76px);line-height:.96;letter-spacing:-.04em}.not-found-page>p{max-width:620px;margin:25px 0 0;color:var(--muted);font-size:18px;line-height:1.55}.not-found-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:34px}.seo-prerender-shell{min-height:100vh;background:var(--field);color:var(--ink)}.seo-prerender-header{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:30px;padding:0 clamp(20px,4vw,64px);border-bottom:1px solid var(--line)}.seo-prerender-header>a,.seo-prerender-header nav{display:flex;align-items:center;gap:12px}.seo-prerender-header a{color:var(--ink);text-decoration:none;font-weight:700}.seo-prerender-header nav{gap:24px}.seo-prerender-header nav a{color:var(--muted);font-size:14px}.seo-prerender-main{max-width:1120px;margin:auto;padding:88px clamp(20px,5vw,80px) 110px}.seo-prerender-main article>h1{max-width:900px;margin:0;font-size:clamp(48px,6vw,78px);line-height:.95;letter-spacing:-.04em}.seo-prerender-main article>p{max-width:72ch;color:var(--muted);font-size:17px;line-height:1.62}.seo-prerender-main .seo-prerender-intro{margin:30px 0 42px;color:#4a5668;font-size:20px}.seo-prerender-code{margin-top:58px}.seo-prerender-code h2,.seo-prerender-links h2{margin:0 0 22px;font-size:28px;letter-spacing:-.025em}.seo-prerender-code pre{padding:22px;overflow-x:auto;border:1px solid var(--line-dark);background:var(--paper);font-family:var(--mono);font-size:13px;line-height:1.7}.seo-prerender-links{margin-top:64px}.seo-prerender-links ul{margin:0;padding:0;border-bottom:1px solid var(--ink);list-style:none}.seo-prerender-links li{border-top:1px solid var(--ink)}.seo-prerender-links a{display:block;padding:18px 0;color:var(--ink);text-decoration:none}.seo-prerender-links strong,.seo-prerender-links span{display:block}.seo-prerender-links span{max-width:72ch;margin-top:5px;color:var(--muted);font-size:13px;line-height:1.45}.seo-prerender-footer{display:grid;grid-template-columns:auto minmax(0,720px);justify-content:space-between;gap:40px;padding:30px clamp(20px,4vw,64px);border-top:1px solid var(--line);background:var(--paper);color:var(--muted)}.seo-prerender-footer>div{display:flex;flex-direction:column;gap:8px;font-size:11px}.seo-prerender-footer code,.seo-prerender-footer a{color:var(--ink)}.seo-prerender-footer p{margin:0;font-size:12px;line-height:1.55}@media(max-width:1100px){.home-hero{grid-template-columns:1fr;gap:35px;padding-top:70px}.pipeline-diagram{min-height:310px}.module-band{grid-template-columns:.62fr 1.38fr}.hard-mode-challenge{grid-template-columns:56px 1fr auto}.hard-mode-branches{display:none}.workspace-grid{grid-template-columns:260px 1fr;grid-template-rows:minmax(390px,1.2fr) minmax(310px,.8fr);height:auto}.lesson-panel{grid-row:1 / 3}.editor-panel{grid-row:1;border-right:0;border-bottom:1px solid var(--line-dark)}.data-panel{display:none}.results-panel{grid-column:2}.operators-hero{grid-template-columns:1fr;gap:54px}.pipeline-anatomy{max-width:720px}.operators-layout{grid-template-columns:220px minmax(0,1fr);gap:45px}.operator-section>header,.operator-entry{grid-template-columns:1fr;gap:22px}.about-hero{grid-template-columns:1fr;min-height:auto;gap:58px}.about-route{max-width:620px}}@media(max-width:760px){.masthead{height:58px;grid-template-columns:1fr auto;padding:0 16px}.masthead nav{display:none}.brand{font-size:16px}.text-button{font-size:0}.text-button svg{width:17px;height:17px}.site-footer{display:block;padding:26px 20px 30px}.site-footer p{margin-top:12px}.workspace-heading-actions{display:block}.workspace-heading-actions .share-button{margin-bottom:10px}.home-hero{min-height:auto;padding:58px 20px 66px;gap:36px}.hero-copy h1{font-size:clamp(48px,15vw,68px)}.hero-copy>p{margin-top:24px;font-size:18px}.hero-actions{flex-direction:column;align-items:stretch}.course-entry-note{font-size:13px}.course-entry-note a{width:fit-content;margin:6px 0 0}.course-progress{margin-top:38px}.pipeline-diagram{min-height:360px;grid-template-columns:1fr 1fr;gap:12px;padding:0}.pipeline-diagram:before,.pipeline-diagram:after{content:"";position:absolute;background:var(--line-dark);z-index:0}.pipeline-diagram:before{width:1px;top:18%;bottom:13%;left:50%}.pipeline-diagram:after{height:1px;left:18%;right:13%;top:50%}.pipeline-axis{display:none}.diagram-stage{min-height:130px;transform:none}.diagram-stage{z-index:1}.diagram-arrow{display:none}.diagram-stage--1,.diagram-stage--3{transform:translateY(28px)}.curriculum-section{padding:68px 20px 74px}.section-heading{display:block;margin-bottom:38px}.section-heading h2{font-size:40px}.section-heading p{margin-top:18px}.course-primer{grid-template-columns:38px 1fr auto;gap:14px;padding-right:0;margin-bottom:28px}.course-primer>code{display:none}.course-primer-action{font-size:0}.course-primer-action svg{width:19px;height:19px}.course-primer-copy small{font-size:11px}.module-band{display:block}.module-meta{min-height:auto;padding:24px 0;border-right:0;border-bottom:1px solid var(--line);grid-template-columns:38px 1fr}.module-meta code{display:none}.challenge-list a{padding-left:0}.challenge-list a>svg{margin-right:4px}.hard-mode-section{margin-top:56px}.hard-mode-section>header{min-height:auto;display:block;padding:28px 24px}.hard-mode-section h2{font-size:48px}.hard-mode-section header code{display:block;margin-top:22px}.hard-mode-challenge{min-height:0;grid-template-columns:52px 1fr;gap:16px;padding:22px 24px 25px}.hard-mode-order{width:48px;height:48px}.hard-mode-copy strong{font-size:17px}.hard-mode-action{grid-column:2}.mastery-section{padding:64px 20px 78px}.mastery-section>.mastery-inner>header{display:block;padding-bottom:32px}.mastery-section header p{margin-top:20px;font-size:17px}.mastery-list a{min-height:0;grid-template-columns:48px 1fr auto;gap:14px;padding:20px 0}.mastery-order{width:42px;height:42px}.mastery-list a>code{display:none}.mastery-action{font-size:0}.mastery-action svg{width:19px;height:19px}.challenge-workspace{padding:16px}.workspace-heading{min-height:94px;margin-bottom:12px}.workspace-heading h1{font-size:31px}.stage-readout{display:none}.mobile-tabs{display:grid;grid-template-columns:repeat(4,1fr);margin-bottom:10px;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}.mobile-tabs button{border:0;border-right:1px solid var(--line);background:#fff;padding:10px 4px;color:var(--muted);text-transform:capitalize;font-size:11px;font-weight:700}.mobile-tabs button:last-child{border-right:0}.mobile-tabs button[aria-selected=true]{color:#fff;background:var(--cobalt)}.workspace-grid{display:block;height:calc(100vh - 223px);min-height:520px;border-radius:0}.mobile-panel{display:none;height:100%;border:0}.mobile-panel--active{display:flex}.lesson-panel.mobile-panel--active{display:block;overflow:auto}.editor-panel.mobile-panel--active{display:grid;grid-template-rows:46px 1fr 56px}.data-panel.mobile-panel--active{display:grid;grid-template-rows:46px 1fr auto}.results-panel.mobile-panel--active{display:flex}.run-button kbd{display:none}.playground-page{padding:18px 14px}.playground-heading{display:block;padding:10px 0 22px}.playground-heading h1{font-size:32px}.simulator-note{margin-top:18px}.playground-grid{height:auto;min-height:0;display:block;border:0;box-shadow:none;background:transparent}.play-editor,.play-data,.play-results{height:520px;border:1px solid var(--line-dark);background:#fff;margin-bottom:14px}.play-data,.play-results{height:420px;display:flex;flex-direction:column}.play-data .json-view,.play-results .json-view{flex:1}.operators-hero{min-height:auto;padding:56px 20px 64px;gap:48px}.operators-hero-copy h1{font-size:clamp(48px,14vw,64px)}.operators-hero-copy>p{margin-top:24px;font-size:18px}.operators-actions{flex-direction:column;align-items:stretch}.pipeline-anatomy pre{padding:17px 14px;font-size:11px}.operators-layout{display:block;padding:54px 20px 84px}.operators-index{position:static;margin-bottom:70px}.operators-index dl{display:grid;grid-template-columns:1fr}.operator-section+.operator-section{margin-top:72px}.operator-section>header{display:block;margin-bottom:26px}.operator-section>header h2{font-size:38px}.operator-section>header p{margin-top:17px}.operator-entry{display:block;padding:27px 0 30px}.operator-title-line{align-items:baseline}.operator-syntax{margin-top:22px;padding:16px 14px;font-size:11px}.operator-detail-page{padding:48px 20px 72px}.operator-detail-hero{min-height:auto;display:block;padding-bottom:42px}.operator-detail-hero h1{font-size:clamp(46px,13vw,64px)}.operator-detail-hero p{font-size:18px}.operator-detail-hero .share-button{margin-top:28px}.operator-detail-layout{display:block;padding:52px 0 60px}.operator-detail-article>section+section{margin-top:58px}.operator-detail-section-heading{display:block}.operator-detail-section-heading a{margin:-8px 0 20px}.operator-detail-code{padding:18px 15px;font-size:12px}.operator-practice-list a{min-height:0;grid-template-columns:34px minmax(0,1fr) auto;gap:13px;padding:20px 0}.operator-detail-aside{position:static;margin-top:58px}.operator-sequence{min-height:100px;gap:16px}.about-hero{padding:58px 20px 68px}.about-hero p{font-size:18px}.about-route{grid-template-columns:auto 1fr auto 1fr auto 1fr auto;gap:5px;font-size:8px}.about-methodology{padding:66px 20px 76px}.about-methodology>header{display:block;margin-bottom:38px}.about-methodology>header p{margin-top:18px}.methodology-list article{grid-template-columns:34px 26px minmax(0,1fr);gap:12px}.methodology-list h3{font-size:20px}.about-trust{grid-template-columns:1fr;gap:54px;padding-block:68px}.about-actions{display:block;padding:28px 0}.about-actions .primary-button{margin-top:24px;width:100%}.not-found-actions{flex-direction:column;width:min(100%,360px)}.seo-prerender-header nav{display:none}.seo-prerender-main{padding-block:60px 78px}.seo-prerender-main .seo-prerender-intro{font-size:18px}.seo-prerender-footer{display:block}.seo-prerender-footer p{margin-top:16px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
