@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/barlow-latin-400-normal-qiz4-Cze.woff2) format("woff2"),url(/assets/barlow-latin-400-normal-fsAxiSwU.woff) format("woff")}@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/barlow-latin-ext-400-normal-HxX4XjxC.woff2) format("woff2"),url(/assets/barlow-latin-ext-400-normal-CvBsJvxq.woff) format("woff")}@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/barlow-latin-500-normal-BPAOfeC8.woff2) format("woff2"),url(/assets/barlow-latin-500-normal-C1h8hMer.woff) format("woff")}@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/barlow-latin-ext-500-normal-DOaysfXq.woff2) format("woff2"),url(/assets/barlow-latin-ext-500-normal-CJPcKP2Q.woff) format("woff")}@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/barlow-latin-600-normal-DILqtrty.woff2) format("woff2"),url(/assets/barlow-latin-600-normal-CNwfPWQD.woff) format("woff")}@font-face{font-family:Barlow;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/barlow-latin-ext-600-normal-B8NK_A3D.woff2) format("woff2"),url(/assets/barlow-latin-ext-600-normal-DMVRjfRT.woff) format("woff")}@font-face{font-family:Barlow Condensed;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/barlow-condensed-latin-700-normal-v1xN8_Wq.woff2) format("woff2"),url(/assets/barlow-condensed-latin-700-normal-Dmwat-ge.woff) format("woff")}@font-face{font-family:Barlow Condensed;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/barlow-condensed-latin-ext-700-normal-CwuXbfVR.woff2) format("woff2"),url(/assets/barlow-condensed-latin-ext-700-normal-BIHFfxf0.woff) format("woff")}:root{color-scheme:dark;--asphalt-0: #0a0d12;--asphalt-1: #171d26;--asphalt-2: #232b36;--asphalt-3: #313a47;--gravel: #46505e;--plate: #06080c;--line: rgba(244, 241, 232, .12);--line-2: rgba(244, 241, 232, .22);--paint: #f4f1e8;--paint-dim: #b9b6ad;--muted: #8a9099;--amber: #f2c14e;--amber-hi: #f7cf6d;--amber-tint: #2b2414;--amber-glow: rgba(242, 193, 78, .28);--warn-soft: #3a2f14;--warn-border: #6b5320;--warn-text: #f0d089;--go-surface: #1b3f2b;--go-deep: #2a8342;--go-text: #7ee0a0;--s1: .25rem;--s2: .5rem;--s3: .75rem;--s4: 1rem;--s5: 1.5rem;--s6: 2rem;--r-btn: 12px;--r-card: 16px;--r-pill: 999px;--lift-1: 0 1px 2px rgba(0, 0, 0, .55);--font-display: "Barlow Condensed", "Arial Narrow", sans-serif-condensed, sans-serif;--font-body: "Barlow", system-ui, sans-serif;--font-math: "Barlow", "Segoe UI", system-ui, sans-serif;--col: 46rem}*,*:before,*:after{box-sizing:border-box}html{line-height:1.45;-webkit-text-size-adjust:100%}html,body,#root{margin:0;min-height:100%;background:var(--asphalt-0);color:var(--paint);font-family:var(--font-body);font-size:16px;-webkit-font-smoothing:antialiased}body{font-size:.95rem}h1,h2,h3{font-family:var(--font-display);font-weight:700;margin:0;line-height:1.15}a{color:var(--amber);text-decoration:none}a:hover{text-decoration:underline}button,input,select{font:inherit;color:inherit}button{background:none;border:0;padding:0;margin:0;cursor:pointer;touch-action:manipulation}:focus-visible{outline:2px solid var(--amber);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.shell{max-width:var(--col);margin:0 auto;padding:var(--s3) var(--s4) var(--s6);padding-left:max(var(--s4),env(safe-area-inset-left));padding-right:max(var(--s4),env(safe-area-inset-right))}.top{display:flex;align-items:center;justify-content:space-between;gap:var(--s3);padding:var(--s2) 0 var(--s3)}.brand{display:inline-flex;align-items:center;gap:var(--s2);color:var(--paint)}.brand:hover{text-decoration:none}.brand-name{font-family:var(--font-display);font-weight:700;font-size:1.35rem;letter-spacing:.01em}.mark{display:block}.tagline{margin:0 0 var(--s4);color:var(--paint-dim);max-width:36rem}.main{display:flex;flex-direction:column;gap:var(--s4)}.foot{margin-top:var(--s6);padding-top:var(--s4);border-top:1px solid var(--line);color:var(--muted);font-size:.8rem}.section-title{font-family:var(--font-display);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:var(--s4) 0 var(--s2)}.eyebrow{margin:0;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.hint{color:var(--paint-dim);margin:var(--s2) 0}.callout{background:var(--warn-soft);border:1px solid var(--warn-border);color:var(--warn-text);border-radius:var(--r-btn);padding:var(--s3) var(--s4);margin:var(--s3) 0}.back{display:inline-block;color:var(--muted);font-size:.85rem;margin-bottom:var(--s3)}.back:hover{color:var(--paint)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--s2);border-radius:var(--r-btn);padding:.6rem 1rem;min-height:40px;font-weight:600;font-size:.9rem;background:var(--asphalt-2);box-shadow:inset 0 0 0 1px var(--line),var(--lift-1);transition:background-color .15s ease,color .15s ease}.btn:hover{background:var(--asphalt-3)}.btn-ghost{background:transparent;box-shadow:none;color:var(--muted)}.btn-ghost:hover{background:var(--asphalt-2);color:var(--paint)}.btn-small{min-height:32px;padding:.3rem .7rem;font-size:.8rem}.chips{display:flex;flex-wrap:wrap;gap:var(--s2)}.chip{min-width:48px;min-height:44px;padding:0 var(--s3);border-radius:var(--r-btn);background:var(--asphalt-1);box-shadow:inset 0 0 0 1px var(--line),var(--lift-1);display:inline-flex;align-items:center;justify-content:center;font-size:1.15rem;transition:background-color .15s ease,color .15s ease,transform 90ms ease-out}.chip:hover{background:var(--asphalt-2)}.chip:active{transform:translateY(1px);box-shadow:inset 0 0 0 1px var(--line)}.chip.is-on{background:var(--amber);color:var(--plate);box-shadow:none}.tabs{display:flex;flex-wrap:wrap;gap:var(--s2)}.tab{padding:.5rem .95rem;border-radius:var(--r-pill);background:var(--asphalt-1);box-shadow:inset 0 0 0 1px var(--line);color:var(--paint-dim);font-weight:600;font-size:.9rem}.tab:hover{text-decoration:none;background:var(--asphalt-2);color:var(--paint)}.tab.is-on{background:var(--amber-tint);color:var(--amber);box-shadow:inset 0 0 0 1px var(--warn-border)}.tab-custom{margin-left:auto}.list{display:flex;flex-direction:column;gap:var(--s3)}.search{display:block}.search-input,.field-input,.eqfield-input,.field-unit{width:100%;background:var(--asphalt-1);border:1px solid var(--line);border-radius:var(--r-btn);color:var(--paint);padding:.65rem .85rem;min-height:44px;outline:none}.search-input:focus,.field-input:focus,.eqfield-input:focus,.field-unit:focus{border-color:var(--amber);box-shadow:0 0 0 3px var(--amber-glow)}.search-input::placeholder,.field-input::placeholder,.eqfield-input::placeholder{color:var(--muted)}.topic+.topic{margin-top:var(--s2)}.cards{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(15rem,1fr));gap:var(--s2)}.card{display:flex;flex-direction:column;gap:var(--s2);padding:var(--s3) var(--s4);min-height:6rem;background:var(--asphalt-1);border:1px solid var(--line);border-radius:var(--r-card);color:var(--paint);box-shadow:var(--lift-1);transition:transform 90ms ease-out,background-color .15s ease,border-color .15s ease}.card:hover{text-decoration:none;background:var(--asphalt-2);border-color:var(--line-2)}.card:active{transform:translateY(1px);box-shadow:none}.card-eq{font-size:1.15rem;flex:1;display:flex;align-items:center}.card-name{color:var(--paint-dim);font-size:.85rem}.formula{display:flex;flex-direction:column}.formula-title{font-size:1.6rem;margin:var(--s1) 0 var(--s3)}.formula-eq{background:var(--asphalt-1);border:1px solid var(--line);border-radius:var(--r-card);padding:var(--s4) var(--s4);overflow-x:auto}.legend{margin:var(--s3) 0 0;display:grid;grid-template-columns:auto 1fr;gap:var(--s1) var(--s3);font-size:.9rem}.legend-row{display:contents}.legend dt{color:var(--paint);font-size:1rem;text-align:right}.legend dd{margin:0;color:var(--paint-dim)}.legend-unit{color:var(--muted)}.solved{margin-top:var(--s3)}.solved-eq{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--s3);background:var(--asphalt-1);border:1px solid var(--warn-border);border-radius:var(--r-card);padding:var(--s4);overflow-x:auto}.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--s2)}.step{display:flex;gap:var(--s3);align-items:flex-start}.step-n{flex:0 0 auto;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--amber-tint);color:var(--amber);font-family:var(--font-display);font-weight:700;font-size:.85rem;margin-top:2px}.step-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:var(--s1)}.step-text{color:var(--paint-dim);font-size:.9rem}.step-eq{background:var(--asphalt-1);border:1px solid var(--line);border-radius:var(--r-btn);padding:var(--s2) var(--s3);overflow-x:auto;font-size:1.05rem}.calc{margin-top:var(--s3)}.calc-head{display:flex;align-items:baseline;justify-content:space-between;gap:var(--s3)}.calc-actions{display:flex;gap:var(--s1)}.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(16rem,1fr));gap:var(--s3)}.field{display:flex;flex-direction:column;gap:var(--s1)}.field-label{display:flex;align-items:baseline;gap:var(--s2);font-size:.85rem;color:var(--paint-dim)}.field-label .m{font-size:1.05rem;color:var(--paint)}.field-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.field-const{color:var(--muted)}.field-row{display:flex;gap:var(--s2)}.field-input{flex:1;min-width:0;font-variant-numeric:tabular-nums}.field-unit{flex:0 0 auto;width:auto;min-width:5.5rem;max-width:9rem;background:var(--asphalt-2)}.field-unit-fixed{display:inline-flex;align-items:center;color:var(--paint-dim)}select.field-unit{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:1.6rem;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 14px) 50%,calc(100% - 9px) 50%;background-size:5px 5px;background-repeat:no-repeat}.result{margin-top:var(--s4);background:var(--asphalt-1);border:1px solid var(--line);border-radius:var(--r-card);padding:var(--s3) var(--s4)}.result.is-ready{border-color:var(--go-deep);background:var(--go-surface)}.result-hint{margin:0;color:var(--paint-dim)}.result-sub{margin:0 0 var(--s2);display:flex;flex-direction:column;gap:var(--s1);overflow-x:auto}.result-sub-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}.result-main{display:flex;flex-direction:column;gap:var(--s1)}.result-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--go-text)}.result-value{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s2);font-size:1.3rem}.result-number{font-family:var(--font-display);font-size:1.8rem;font-variant-numeric:tabular-nums}.result-unit{color:var(--paint-dim)}.calc-note{color:var(--muted);font-size:.8rem}.eqfield{display:block;margin:var(--s2) 0}.eqfield-input{font-size:1.15rem;font-family:var(--font-math)}.help{margin-top:var(--s5);color:var(--paint-dim);font-size:.9rem}.help summary{cursor:pointer;color:var(--paint);font-weight:600}.help ul{padding-left:1.2rem}.help li{margin:var(--s1) 0}.m{display:inline-flex;align-items:center;flex-wrap:nowrap;font-family:var(--font-math);font-variant-numeric:tabular-nums;white-space:nowrap;line-height:1.2;vertical-align:middle}.m-big{font-size:1.5rem}.m-inline{font-size:1em}.m-var{font-style:italic}.m-upright{font-style:normal}.m-sub{font-size:.7em;font-style:normal;line-height:1;vertical-align:-.25em}.m-sup{font-size:.7em;line-height:1;display:inline-flex;align-items:center;margin-top:-.2em;margin-left:.06em}.m-const,.m-num{font-style:normal}.m-op{margin:0 .18em}.m-op-bin{margin:0 .35em}.m-op-eq{margin:0 .5em}.m-dot{margin:0 .12em}.m-sum,.m-prod,.m-func{display:inline-flex;align-items:center}.m-pow{display:inline-flex;align-items:flex-start}.m-sum>span{display:inline-flex;align-items:center}.m-paren{display:inline-flex;align-items:stretch;min-height:1.2em}.m-paren>*{align-self:center}.m-bracket,.m-radical{align-self:stretch;flex:0 0 auto;height:auto;min-height:1.2em;display:block}.m-bracket{width:.32em}.m-radical{width:.65em;margin-right:-1px}.m-paren-text,.m-root-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.m-frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 .15em}.m-frac-num,.m-frac-den{display:inline-flex;align-items:center;padding:.05em .25em}.m-frac-num{border-bottom:1.5px solid currentColor}.m-root{display:inline-flex;align-items:stretch;min-height:1.2em}.m-root-index{font-size:.6em;align-self:flex-start;margin-right:-.2em}.m-root-arg{display:inline-flex;align-items:center;border-top:1.5px solid currentColor;padding:.15em .25em 0 .2em}.m-func-name{font-style:normal;margin-right:.05em}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important}}