@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-cyrillic-ext-wght-normal-BOeWTOD4.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-cyrillic-wght-normal-DqGufNeO.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-greek-ext-wght-normal-DlzME5K_.woff2)format("woff2-variations");unicode-range:U+1F??}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-greek-wght-normal-CkhJZR-_.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-vietnamese-wght-normal-CBcvBZtf.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-latin-ext-wght-normal-DO1Apj_S.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,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:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-latin-wght-normal-Dx4kXJAl.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--paper:#f7f6f3;--card:#fff;--ink:#1f2328;--mute:#687076;--line:#e6e4df;--soft:#efede8;--acc:#c8553d;--acc-soft:#f6e6e1;--teal:#2f7d6d;--teal-soft:#e3f0ec;--sun:#d99a3d;--sun-soft:#f7efe2;--warn:#c2410c;--warn-soft:#fbe3d6;--kraft:#efe3cf;--cream:#fbf6ec;--navy:#2f4858;--paper-shadow:0 1px 1px #4a33180f, 0 4px 10px -2px #4a33181f, 0 14px 28px -14px #4a331840;--grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' seed='4' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.29 0 0 0 0 0.2 0 0 0 0 0.09 0 0 0 0.09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");--serif:"Inter Variable", Inter, system-ui, sans-serif;--paper-lifted:0 2px 2px #4a33180f, 0 10px 20px -6px #4a331833, 0 30px 50px -24px #4a331859;--sans:"Inter Variable", Inter, system-ui, -apple-system, "Segoe UI", sans-serif;--mono:"JetBrains Mono", ui-monospace, Menlo, monospace;--r:10px;--shadow:0 1px 2px #0000000d, 0 1px 0 #0000000a;font:16.5px/1.7 var(--sans);color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}a{color:inherit}html{scroll-behavior:smooth}h1,h2{font-family:var(--serif);letter-spacing:-.03em;text-wrap:balance;font-weight:800}h3{text-wrap:balance}p{text-wrap:pretty}:focus-visible{outline:3px solid var(--sun);outline-offset:2px}.skip{z-index:50;background:var(--ink);color:#fff;border-radius:8px;padding:8px 14px;font-weight:600;text-decoration:none;position:absolute;top:8px;left:-9999px}.skip:focus{left:12px}h3{margin:30px 0 10px;font-size:20px}code{font-family:var(--mono);background:var(--soft);border-radius:5px;padding:1px 6px;font-size:.88em}pre.code{background:var(--ink);color:#eceae4;font:14px/1.6 var(--mono);border-radius:10px;margin:0 0 12px;padding:14px 16px;overflow-x:auto}ul,ol{padding-left:22px}.muted{color:var(--mute)}.ok{color:var(--teal);font-weight:700}.warn{color:var(--warn);font-weight:700}button{font:inherit;cursor:pointer}.btn,.btn-quiet,.btn-run,.btn-light,.pill{border:0;border-radius:10px;padding:8px 14px;font-size:14px;font-weight:600;text-decoration:none;display:inline-block}.btn,.btn-run{background:var(--ink);color:#fff}.btn-run:disabled{opacity:.6;cursor:default}.btn-quiet{background:var(--soft);color:var(--ink)}.btn-light{color:var(--ink);background:#fff}.btn-quiet.sm{margin-left:6px;padding:1px 8px;font-size:12px}.btn,.btn-quiet,.btn-light,.btn-run,.next-card button{transition:transform .15s,background-color .2s,box-shadow .2s}.btn:hover,.btn-run:not(:disabled):hover{background:#343a40;transform:translateY(-1px);box-shadow:0 8px 18px -10px #1f2328aa}.btn-quiet:hover{background:#e7e3db}.btn-light:hover,.next-card button:hover{background:var(--cream)}.btn:active,.btn-quiet:active,.btn-light:active,.btn-run:not(:disabled):active,.next-card button:active{transform:translateY(1px)scale(.98)}.text-link{border-bottom:2px solid var(--sun);padding-bottom:1px;font-size:15px;font-weight:600;text-decoration:none;transition:border-color .2s}.text-link:hover{border-color:var(--ink)}.big{padding:12px 20px;font-size:15px}.pill{background:var(--soft);border-radius:99px;padding:3px 10px;font-size:13px;font-weight:500}input:not([type]),input[type=text]{font:inherit;border:1px solid var(--line);background:#fff;border-radius:10px;min-width:0;padding:8px 12px;font-size:15px}input[type=range]{width:100%;accent-color:var(--acc)}.seg{background:var(--soft);border-radius:10px;padding:3px;display:inline-flex}.seg button{color:var(--mute);background:0 0;border:0;border-radius:8px;padding:5px 12px;font-size:14px}.seg button.on{color:var(--ink);box-shadow:var(--shadow);background:#fff;font-weight:600}.switch{cursor:pointer;align-items:center;gap:10px;margin:8px 0;font-size:15px;display:inline-flex}.switch input{display:none}.switch span{background:var(--line);border-radius:99px;flex:none;width:38px;height:22px;transition:all .2s;position:relative}.switch span:after{content:"";background:#fff;border-radius:50%;width:16px;height:16px;transition:all .2s;position:absolute;top:3px;left:3px}.switch input:checked+span{background:var(--teal)}.switch input:checked+span:after{left:19px}.topbar{z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);background:#fffffff0;align-items:center;gap:18px;padding:11px 24px;display:flex;position:sticky;top:0}.logo{font:800 14px var(--sans);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:12px;text-decoration:none;display:inline-flex}.logo .dots{gap:4px;display:inline-flex}.logo .dots i{background:var(--cream);border-radius:50%;width:10px;height:10px;box-shadow:inset 0 0 0 1.5px #cdbd9f}.logo .dots i.on{background:var(--teal);box-shadow:none}.topbar.on-kraft{background:#efe3cfeb;border-bottom-color:#e2d3bb}.top-links{gap:18px;font-size:15px;display:flex}.top-links a{color:var(--mute);text-decoration:none}.top-links a:hover{color:var(--ink)}.crumb{color:var(--mute);font-size:15px}.crumb a{text-decoration:none}.crumb b{color:var(--ink);font-weight:600}.grow{flex:1}.layout{grid-template-columns:260px minmax(0,1fr) 340px;min-height:calc(100vh - 57px);display:grid}.layout.no-aside{grid-template-columns:260px minmax(0,1fr)}.side{border-right:1px solid var(--line);height:calc(100vh - 57px);padding:22px 16px;position:sticky;top:57px;overflow:auto}main{justify-self:center;width:100%;max-width:900px;padding:34px 48px 80px}.aside{border-left:1px solid var(--line);background:#fbfaf7;height:calc(100vh - 57px);padding:22px 18px;position:sticky;top:57px;overflow:auto}.progress-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);margin-bottom:14px;padding:14px}progress{appearance:none;background:var(--soft);width:100%;color:var(--teal);border:0;border-radius:9px;display:block;overflow:hidden}progress::-webkit-progress-bar{background:var(--soft)}progress::-webkit-progress-value{background:currentColor;border-radius:9px;transition:width .4s}progress::-moz-progress-bar{background:currentColor;border-radius:9px}.progress-card .bar{height:8px;margin:8px 0 4px}.progress-card small{color:var(--mute)}.lens-link{border-radius:10px;grid-template-columns:28px 1fr;align-items:center;gap:10px;padding:8px 10px;font-size:15px;text-decoration:none;display:grid}.lens-link:hover{background:var(--soft)}.lens-link small{color:var(--mute)}.lens-link .dot{background:var(--soft);width:26px;height:26px;color:var(--mute);border-radius:50%;place-items:center;font-size:12px;font-weight:600;display:grid}.lens-link.done .dot{background:var(--teal);color:#fff}.lens-link.cur{background:#ecebe7;font-weight:600}.lens-link.cur .dot{background:var(--ink);color:#fff}.help{color:var(--mute);background:var(--sun-soft);border-radius:10px;margin-top:18px;padding:12px;font-size:14px}.more-topics{flex-direction:column;gap:2px;margin-top:18px;font-size:14px;display:flex}.more-topics .label{color:var(--mute);text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px;font-size:11px;font-weight:600}.more-topics a{padding:3px 0;font-weight:600;text-decoration:none}.more-topics span{color:var(--mute);padding:3px 0}.more-topics em{background:var(--soft);border-radius:99px;margin-left:4px;padding:0 6px;font-size:11px;font-style:normal}.more-topics a.all{color:var(--mute);margin-top:6px;font-weight:500}.eyebrow{font:600 12px var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--acc)}.hero{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:34px}.hero h1{margin:6px 0 10px;font-size:46px;line-height:1.1}.hero .hook{font-size:19px}.topic-video{margin-top:18px}.chips{flex-wrap:wrap;gap:8px;display:flex}.chips span,.chip-link{background:var(--soft);border-radius:99px;padding:3px 12px;font-size:14px}.chip-link{background:var(--teal-soft);color:var(--teal);font-weight:600;text-decoration:none}.chip-link:hover{background:var(--teal);color:#fff}.cta{flex-wrap:wrap;align-items:center;gap:10px 18px;margin-top:22px;display:flex}.goals{grid-template-columns:1fr 1fr;gap:12px;display:grid}.goals div{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 18px}.goals b,.goals span{display:block}.goals span{color:var(--mute);font-size:15px}.path{grid-template-columns:repeat(4,1fr);gap:12px;display:grid}.path a{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px;text-decoration:none;transition:border-color .2s}.path a:hover{border-color:var(--ink)}.path a b,.path a small{display:block}.path a small{color:var(--mute);font-size:13px}.path .n{background:var(--soft);border-radius:50%;place-items:center;width:24px;height:24px;margin-bottom:6px;font-size:12px;font-weight:600;display:inline-grid}.path a.done .n{background:var(--teal);color:#fff}.lesson h2{margin:4px 0 6px;font-size:36px;line-height:1.15}.one-line{background:var(--teal-soft);border-radius:var(--r);margin:14px 0 20px;padding:14px 18px;font-size:18px}.one-line b{color:var(--teal)}.clip{margin:0 0 18px}.clip video{border-radius:var(--r);background:#111;width:100%;display:block}.clip figcaption{color:var(--mute);margin-top:6px;font-size:13px}.note{border-left:3px solid var(--sun);background:var(--sun-soft);border-radius:0 8px 8px 0;margin:18px 0;padding:10px 16px;display:block}.note-label{font:600 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;color:#8a6420;margin-bottom:2px;display:block}.next-card{background:var(--ink);color:#fff;border-radius:12px;justify-content:space-between;align-items:center;gap:16px;margin-top:32px;padding:20px 24px;display:flex}.next-card small{color:#c7c4bc;display:block}.next-card b{font-size:20px;font-weight:600}.next-card button{color:var(--ink);background:#fff;border:0;border-radius:10px;padding:10px 18px;font-weight:600}.prev{color:var(--mute);margin-top:12px;font-size:15px;text-decoration:none;display:inline-block}.examples li{margin:2px 0}.checklist li{margin:6px 0;font-size:17px}.in-depth{border-left:2px dashed var(--line);margin:10px 0;padding-left:14px}.in-depth:before{content:"In depth";font:600 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--mute);display:block}.cell{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:18px 0;overflow:visible}.cell-h{border-bottom:1px dashed var(--line);flex-wrap:wrap;align-items:center;gap:10px;padding:12px 18px;display:flex}.cell-title{font-weight:700}.cell-actions{gap:8px;margin-left:auto;display:flex}.cell-b{padding:16px 20px}.cell-b>p:first-child{margin-top:0}.kind{font:600 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;border-radius:99px;padding:3px 10px}.kind-concept{background:var(--sun-soft);color:#8a6420}.kind-run{background:var(--acc-soft);color:var(--acc)}.kind-example,.kind-explore{background:var(--teal-soft);color:var(--teal)}.kind-check{background:var(--soft);color:var(--ink)}.run-out{min-height:120px}.item-chip{background:var(--acc);color:#fff;border-radius:6px;margin-bottom:12px;padding:3px 12px;font-weight:700;display:inline-block}.run-caption{color:var(--mute);min-height:1.7em;margin:22px 0 0}.what-happened{background:var(--sun-soft);border-radius:10px;margin-top:12px;padding:10px 14px}.what-happened b:first-child{color:#8a6420}.term{border-bottom:2px dotted var(--teal);cursor:help}.term-tip{z-index:60;visibility:hidden;background:var(--ink);color:#fff;max-width:min(300px,100vw - 24px);font:400 14px/1.5 var(--sans);pointer-events:none;border-radius:10px;padding:10px 12px;position:fixed;box-shadow:0 10px 24px -10px #0007}.bitrow{flex-wrap:wrap;gap:26px 5px;padding-bottom:18px;display:flex}.bit{border:1px solid var(--line);width:36px;height:38px;font:600 14px var(--sans);color:#b9b5ab;background:#fff;border-radius:6px;place-items:center;transition:background .25s,color .25s,border-color .25s;display:grid;position:relative}.bit small{color:var(--mute);font-size:11px;font-weight:500;position:absolute;bottom:-19px}.bit.on{background:var(--teal);border-color:var(--teal);color:#fff}.bit.probe{outline:3px solid var(--sun);outline-offset:2px}.bit.zero{outline-color:var(--warn)}.look-switches .bit{letter-spacing:.04em;text-transform:uppercase;font-size:10px}.widget{margin-top:6px}.row{flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0;display:flex}.row.nowrap{flex-wrap:nowrap}.row.nowrap input{flex:1}.stats{flex-wrap:wrap;align-items:center;gap:22px;margin:12px 0;display:flex}.stats div b{font-size:22px;display:block}.stats div span{color:var(--mute);font-size:13px}.log{margin:0;padding:0;font-size:14px;list-style:none}.log li{border-bottom:1px solid var(--line);align-items:center;gap:10px;padding:5px 0;display:flex}.tag{border-radius:99px;padding:1px 9px;font-size:12px;font-weight:600}.tag-slow{background:var(--warn-soft);color:var(--warn)}.tag-fast{background:var(--teal-soft);color:var(--teal)}.readout{margin:10px 0 0}.sliders{grid-template-columns:repeat(3,1fr);gap:18px;font-size:14px;display:grid}.sliders label b{margin-left:4px}.chart{width:100%;max-width:540px;display:block}.chart text{font:12px var(--sans);fill:var(--mute)}.chart .grid{stroke:#efede8}.chart .curve{fill:none;stroke:var(--acc);stroke-width:4px;stroke-linecap:round}.chart .dot{fill:var(--sun);stroke:#fff;stroke-width:4px}.chart.bars{max-width:420px;margin-top:8px}.chart .bar{fill:#d9d5cc}.chart .bar.best{fill:var(--teal)}.chart .bar.sel{fill:var(--sun)}.sizebars div{grid-template-columns:110px 1fr 90px;align-items:center;gap:10px;margin:8px 0;font-size:14px;display:grid}.sizebars progress{height:16px;color:var(--ink);background:0 0;border-radius:4px}.sizebars progress::-webkit-progress-bar{background:0 0}.sizebars progress::-webkit-progress-value{border-radius:4px}.sizebars progress::-moz-progress-bar{border-radius:4px}.sizebars .b progress{color:var(--teal)}.sizebars span small{color:var(--mute);font-size:11px;line-height:1.2;display:block}.table{border-collapse:collapse;width:100%;font-size:15px}.table th,.table td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:9px 12px}.table th{color:var(--mute);text-transform:uppercase;letter-spacing:.06em;font-size:12px;font-weight:600}.mini{gap:2px;display:inline-flex}.mini i{background:var(--soft);border-radius:2px;width:10px;height:14px}.mini i.on{background:var(--teal)}.mini i.p{outline:2px solid var(--sun)}.mini i.z{outline:2px solid var(--warn);background:#fff}.chip{background:var(--paper);border:1px solid var(--line);border-radius:99px;padding:3px 12px;font-size:14px}.chip.gone{opacity:.55}.chip small{color:var(--mute)}.knobs{grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:12px;display:grid}.knobs div{background:var(--paper);border-radius:var(--r);padding:12px 14px}.knobs b{font:500 30px var(--serif);color:var(--acc);display:block}.knobs span{color:var(--mute);font-size:14px}.uses{grid-template-columns:1fr 1fr;gap:12px;display:grid}.uses div{background:var(--paper);border-radius:var(--r);padding:12px 16px}.uses p{color:var(--mute);margin:4px 0 0;font-size:15px}.figure{margin:10px 0 0}.figure figcaption{color:var(--mute);font-size:13px}.flow{width:100%;max-width:580px;color:var(--ink);display:block}.flow text{font:600 15px var(--sans);fill:var(--ink)}.flow .sub{font:12px var(--sans);fill:var(--mute)}.flow .sub.ok{fill:var(--teal);font-weight:600}.flow .box{fill:#fff;stroke:var(--ink);stroke-width:1.5px}.flow .box.mem{fill:var(--teal-soft);stroke:var(--teal)}.flow .go{stroke:var(--ink);stroke-width:2px;fill:none}.flow .maybe{stroke:#a8a49b;stroke-width:2px;fill:none;stroke-dasharray:4 5}.flow .no{stroke:var(--teal);stroke-width:3px;fill:none;stroke-dasharray:8 6;animation:1s linear infinite dash}@keyframes dash{to{stroke-dashoffset:-14px}}@media (prefers-reduced-motion:reduce){.flow .no{animation:none}}.probe-head{margin:0 0 12px}.predict{margin-top:4px}.verdict{border-radius:var(--r);margin-top:4px;padding:12px 16px}.verdict>div{margin-top:10px}.ok-box{background:var(--teal-soft)}.warn-box{background:var(--warn-soft)}.sun-box{background:var(--sun-soft)}.sliders.one{grid-template-columns:1fr;max-width:420px}progress.fill{max-width:540px;height:12px;color:var(--acc);margin:12px 0 4px}.lab-grid{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:start;gap:20px;display:grid}.lab-grid .bitrow{grid-template-columns:repeat(8,1fr);gap:24px 5px;margin-top:12px;display:grid}.lab-grid .bit{width:auto}.lab-grid pre.code{font-size:13px}.trace{white-space:pre;background:#2b2f36;min-height:96px}.small{margin:8px 0 0;font-size:14px}.widget button:disabled,.widget input:disabled{opacity:.5;cursor:default}.picker-q{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;padding:10px 0;display:flex}.picker-rec{background:var(--teal-soft);border-radius:var(--r);margin-top:14px;padding:14px 18px}.picker-rec b{font:500 24px var(--serif);color:var(--teal)}.picker-rec p{margin:4px 0 10px}.sstables{grid-template-columns:repeat(5,1fr);gap:8px;margin:12px 0;display:grid}.sst{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);min-height:92px;padding:10px;font-size:14px;transition:all .3s}.sst b{display:block}.sst .bf{background:var(--teal-soft);color:var(--teal);border-radius:99px;padding:0 8px;font-size:11px;font-weight:600;display:inline-block}.sst small{color:var(--mute);margin-top:6px;line-height:1.3;display:block}.sst.skip{opacity:.55}.sst.read-miss{background:var(--warn-soft);border-color:#f0c4ad}.sst.read{background:var(--teal-soft);border-color:var(--teal)}.quiz-q+.quiz-q{border-top:1px solid var(--line);margin-top:18px;padding-top:14px}.quiz-text{margin:0;font-weight:600}.quiz-opts{grid-template-columns:1fr 1fr;gap:8px;margin-top:10px;display:grid}.opt{border:1px solid var(--line);text-align:left;background:#fff;border-radius:10px;padding:10px 14px;font-size:15px}.opt:not(:disabled):hover{border-color:var(--ink)}.opt.right{border-color:var(--teal);background:var(--teal-soft)}.opt.wrong{border-color:var(--warn);background:var(--warn-soft)}.opt.dim{opacity:.55}.quiz-why{color:var(--mute);margin:10px 0 0}.quiz-score{margin:16px 0 0;font-size:17px}.playground h4{margin:0 0 2px;font-size:18px}.playground .muted{margin:0 0 12px;font-size:14px}.playground .ideas{font-size:13px}.playground .bitrow{grid-template-columns:repeat(8,1fr);gap:24px 5px;margin-top:14px;display:grid}.playground .bit{width:auto;height:34px;font-size:13px}.pg-msg{border:1px solid var(--line);background:#fff;border-radius:10px;min-height:48px;margin:6px 0 0;padding:10px 12px;font-size:14px}.pg-msg.ok{border-color:var(--teal);background:var(--teal-soft)}.pg-msg.warn{border-color:var(--warn);background:var(--warn-soft)}.pg-msg.ok,.pg-msg.warn{color:var(--ink);font-weight:400}.missions{margin-top:18px;font-size:14px}.missions div{align-items:center;gap:10px;padding:6px 0;display:flex}.missions i{border:2px solid var(--line);color:#0000;border-radius:50%;flex:none;place-items:center;width:20px;height:20px;font-size:11px;font-style:normal;display:grid}.missions .done{color:var(--mute);text-decoration:line-through}.missions .done i{background:var(--teal);border-color:var(--teal);color:#fff}.site{background:var(--grain), var(--kraft);min-height:calc(100vh - 57px)}.wrap{max-width:1200px;margin:0 auto;padding:0 32px}.kraft{background:0 0}.paper{background:var(--cream);box-shadow:var(--paper-shadow);border-radius:16px}.paper-tag{font:800 12px/1.2 var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--ink);background:#f5e3c2;border-radius:7px;place-self:flex-start start;padding:7px 12px;display:inline-block;transform:rotate(-1.5deg);box-shadow:0 1px 1px #4a331824,0 4px 8px -4px #4a331833}.paper-tag.navy{background:var(--navy);color:var(--cream)}.paper-tag.teal{background:var(--teal);color:var(--cream)}.site h1{font:900 64px/1 var(--sans);letter-spacing:-.04em;margin:18px 0}.lead{color:#3d454b;max-width:42ch;margin:0;font-size:21px;line-height:1.5}.cta{margin-top:30px}.btn.big{background:var(--navy);border-radius:12px;padding:15px 24px;font-size:16px;box-shadow:0 10px 22px -12px #2f4858cc}.btn.big:hover{background:#253b48}.text-link{font-size:16px}.intro{justify-items:start;padding-top:56px;padding-bottom:36px;display:grid}.intro h1{max-width:24ch;margin:18px 0 14px;font-size:56px;line-height:1.02}.intro .lead{max-width:60ch;font-size:19px}.intro-stats{color:#5d5a52;margin:16px 0 0;font-size:15px}.intro-stats b{color:var(--ink);font-weight:800}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.catalog{grid-template-columns:250px minmax(0,1fr);align-items:start;gap:44px;display:grid}.cat-rail{gap:16px;display:grid;position:sticky;top:76px}.search input{width:100%;font:500 15px var(--sans);background:var(--cream);border:0;border-radius:10px;padding:11px 14px;box-shadow:inset 0 0 0 1.5px #e3d5bd}.search input:focus{box-shadow:inset 0 0 0 2px var(--navy), 0 0 0 4px #2f485826;outline:none}.cat-list{gap:2px;display:grid}.cat-list button{text-align:left;font:600 15px var(--sans);color:#3d454b;background:0 0;border:0;border-radius:9px;justify-content:space-between;align-items:center;gap:10px;padding:9px 12px;transition:background-color .2s;display:flex}.cat-list button:hover{background:#e6d8bf}.cat-list button.on{background:var(--navy);color:var(--cream)}.cat-list button small{font:700 12px var(--sans);color:var(--mute);font-variant-numeric:tabular-nums}.cat-list button.on small{color:#b9c4cb}.cat-list button>span{align-items:baseline;gap:8px;display:flex}.cat-list i{vertical-align:1px;background:0 0;border-radius:50%;flex:none;width:8px;height:8px;display:inline-block;box-shadow:inset 0 0 0 1.5px #b9a983}.cat-list i.live{background:var(--teal);box-shadow:none}.cat-main{gap:28px;min-width:0;display:grid}.resume{background:var(--cream);box-shadow:var(--paper-shadow);border-radius:12px;flex-wrap:wrap;align-items:center;gap:14px;padding:14px 18px;text-decoration:none;display:flex}.resume:hover{box-shadow:var(--paper-lifted)}.resume-progress{color:var(--mute);align-items:center;gap:8px;margin-left:auto;font-size:13px;display:inline-flex}.resume-progress progress{width:120px;height:8px}.featured-card{box-shadow:var(--paper-lifted);background:#f5e3c2;border-radius:16px;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:center;gap:28px;padding:18px;display:grid}.featured-card .clip{margin:0}.featured-card .clip video{box-shadow:var(--paper-shadow)}.featured-card .clip figcaption{color:#6b5a3a}.featured-body{justify-items:start;gap:4px;padding-right:10px;display:grid}.featured-body h2{margin:10px 0 2px;font-size:40px}.featured-body h2 a{text-decoration:none}.featured-body p{margin:0}.featured-body .cta{margin-top:14px}.cat-section{scroll-margin-top:76px}.cat-head{border-bottom:2px dashed #cdbd9f;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:18px;margin-bottom:18px;padding-bottom:14px;display:grid}.cat-head .cc-num{font:900 56px/.85 var(--sans);letter-spacing:-.05em;color:#d0bc95}.cat-head h2{margin:0;font-size:30px}.cat-head h2 a{text-decoration:none}.cat-head h2 a:hover{text-underline-offset:4px;text-decoration:underline;text-decoration-thickness:2px}.cat-head p{color:#4b4f53;max-width:64ch;margin:2px 0 0;font-size:15px}.cat-head small{font:700 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--mute);white-space:nowrap}.tiles{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;display:grid}.tile{border-radius:14px;flex-direction:column;align-items:flex-start;gap:8px;min-height:196px;padding:18px;text-decoration:none;display:flex}.tile b{font:800 19px/1.2 var(--sans);letter-spacing:-.02em}.tile p{color:#4b4f53;flex:1;margin:0;font-size:14px;line-height:1.5}.tile .paper-tag{padding:5px 9px;font-size:10px}.tile-foot{width:100%;color:var(--mute);justify-content:space-between;align-items:center;gap:10px;font-size:13px;display:flex}.tile.live{background:var(--cream);box-shadow:var(--paper-shadow);transition:transform .25s cubic-bezier(.22,1,.36,1),box-shadow .25s}.tile.live:hover{box-shadow:var(--paper-lifted);transform:translateY(-3px)}.tile-go{font:800 18px var(--sans);color:var(--teal);transition:transform .2s}.tile.live:hover .tile-go{transform:translate(4px)}.tile-progress{align-items:center;gap:8px;display:inline-flex}.tile-progress progress{width:80px;height:6px}.cat-empty{color:var(--mute);margin:-4px 0 0;font-size:15px}.cat-section:has(.cat-empty) .cat-head{margin-bottom:10px}.result-count{color:var(--mute);margin:0}.empty{justify-items:start;gap:6px;padding:24px;display:grid}.empty p{color:var(--mute);margin:0}.try{background:var(--cream);box-shadow:var(--paper-shadow);border-radius:14px;gap:12px;margin-top:18px;padding:22px;display:grid}.try-input{gap:8px;display:grid}.try-input span{font-size:15px;font-weight:700}.try-input input{font:700 20px var(--sans);background:#fff;border:0;border-radius:10px;padding:12px 14px;box-shadow:inset 0 0 0 1.5px #e3d5bd}.try-input input:focus{box-shadow:inset 0 0 0 2px var(--navy), 0 0 0 4px #2f485826;outline:none}.try-verdict{align-items:center;gap:14px;min-height:48px;display:flex}.try-verdict p{margin:0;font-size:15px;line-height:1.5}.stamp{font:900 18px var(--sans);box-shadow:var(--paper-shadow);border-radius:9px;flex:none;padding:8px 14px;animation:.35s cubic-bezier(.22,1,.36,1) stamp}.stamp.teal{background:var(--teal);color:var(--cream);transform:rotate(-2.5deg)}.stamp.sun{background:var(--sun);color:var(--ink);transform:rotate(2deg)}@keyframes stamp{0%{opacity:0;scale:1.3}to{opacity:1;scale:1}}.page-head{justify-items:start;gap:4px;padding-top:64px;padding-bottom:8px;display:grid}.page-head>small{margin-top:14px}.page-head h1{font-size:72px}.section-title{font:900 36px/1.1 var(--sans);letter-spacing:-.035em;margin:64px 0 22px}.section-sub{margin:-10px 0 18px}.status{font:700 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;background:var(--soft);color:var(--mute);border-radius:6px;align-self:flex-start;padding:3px 9px}.status.live{background:var(--teal);color:var(--cream)}.topic-grid{grid-template-columns:repeat(2,1fr);gap:22px;display:grid}.topic-card{flex-direction:column;align-items:flex-start;gap:10px;padding:28px;display:flex;transform:rotate(-.6deg)}.topic-card h3{font:900 40px/1.05 var(--sans);letter-spacing:-.04em;margin:4px 0 6px}.topic-card h3 a{text-decoration:none}.topic-card p{margin:0}.topic-progress{width:100%;max-width:320px}.topic-progress progress{height:8px}.topic-progress small{color:var(--mute)}.planned{grid-template-columns:repeat(3,1fr);gap:12px;margin:0;padding:0;list-style:none;display:grid}.planned li{background:#f8f1e4;border-radius:12px;flex-wrap:wrap;align-items:center;gap:6px 10px;padding:14px 16px;display:flex;box-shadow:0 1px 1px #4a33180f,0 6px 14px -10px #4a331840}.planned b{flex-basis:100%}.planned small{color:var(--mute)}.planned .chip-link{padding:1px 9px;font-size:12px}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.stamp{animation:none}}.not-found{padding-top:96px;padding-bottom:140px}.not-found h1{overflow-wrap:anywhere;font-size:56px}.site-footer{color:#5d5a52;border-top:2px dashed #cdbd9f;margin-top:140px;padding:30px 0 48px;font-size:15px}.site-footer .wrap{flex-wrap:wrap;align-items:baseline;gap:16px;display:flex}.site-footer b{color:var(--ink);font:800 13px var(--sans);letter-spacing:.16em;text-transform:uppercase}@media (width<=1250px){.layout,.layout.no-aside{grid-template-columns:230px minmax(0,1fr)}.aside{border-left:0;border-top:1px solid var(--line);grid-column:2;height:auto;position:static}}@media (width<=820px){.layout,.layout.no-aside{grid-template-columns:1fr}.side{border-right:0;border-bottom:1px solid var(--line);height:auto;position:static}.aside{grid-column:1}main{padding:22px 16px 60px}.hero,.goals,.uses,.knobs,.sliders,.quiz-opts,.lab-grid{grid-template-columns:1fr}.path,.sstables{grid-template-columns:1fr 1fr}.crumb,.top-links a:last-child{display:none}.wrap{padding:0 18px}.site h1,.intro h1{font-size:40px}.page-head h1{font-size:46px}.lead,.intro .lead{font-size:17px}.intro{padding-top:32px;padding-bottom:20px}.catalog{grid-template-columns:1fr;gap:20px}.cat-rail{z-index:5;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#efe3cff2;gap:10px;margin:0 -18px;padding:10px 18px;position:sticky;top:57px}.cat-list{scrollbar-width:none;gap:6px;display:flex;overflow-x:auto}.cat-list button{background:var(--cream);white-space:nowrap;flex:none;padding:7px 12px}.cat-section{scroll-margin-top:160px}.featured-card{grid-template-columns:1fr;padding:14px}.featured-body{padding:0 6px 6px}.cat-head{grid-template-columns:auto minmax(0,1fr)}.cat-head small{grid-column:2}.cat-head .cc-num{font-size:40px}.tiles,.topic-grid,.planned{grid-template-columns:1fr}.tile{min-height:0}.resume-progress{margin-left:0}}@media (width<=1100px) and (width>=821px){.catalog{grid-template-columns:210px minmax(0,1fr);gap:28px}.featured-card{grid-template-columns:1fr}.tiles{grid-template-columns:repeat(2,minmax(0,1fr))}.planned{grid-template-columns:repeat(2,1fr)}}.newsletter{padding-top:8px;padding-bottom:48px}.newsletter-card{box-shadow:var(--paper-lifted);background:#f5e3c2;border-radius:16px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:center;gap:28px;padding:24px;display:grid}.newsletter-card h2{margin:12px 0 6px}.newsletter-card p{max-width:52ch;margin:0}.newsletter-card iframe{background:0 0;border:0;width:100%;overflow:hidden}@media (width<=760px){.newsletter-card{grid-template-columns:1fr}}