/* ==========================================================================
   GradeLogic — visual system v3 ("instrument")
   Type   Schibsted Grotesk (display) · Instrument Sans (UI/body) · IBM Plex Mono (numbers)
   Colour Logo navy + cobalt, cool neutrals. Dark navy only for output surfaces.
   Shape  Square by default. 2px on controls. No card radii.
   Motifs 1 score rail (ticks + marker)       2 light-weight mono readout numerals
          3 GL/0x section markers + 01/02/03   4 ledger inputs (label ⟷ value on a rule)
          5 numbered calculation sheet         6 navy output rail
   ========================================================================== */
@font-face{font-family:"Schibsted Grotesk";src:url(/assets/fonts/schibsted-grotesk.woff2) format("woff2");font-weight:400 900;font-display:swap}
@font-face{font-family:"Instrument Sans";src:url(/assets/fonts/instrument-sans.woff2) format("woff2");font-weight:400 700;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-300-normal.woff2) format("woff2");font-weight:300;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500 700;font-display:swap}

:root{
  --navy:#031839; --navy-2:#0A2550; --navy-3:#17396F; --ink:#0A1428; --ink-2:#3A465C; --ink-3:#5F6B82; --ink-4:#8791A5;
  --cobalt:#0A6CFF; --cobalt-d:#0052CC; --sky:#5AAEFF; --ice:#E8F1FF;
  --bg:#F5F7FA; --paper:#FFFFFF; --tint:#ECF0F6; --line:#D5DCE6; --line-2:#E6EAF0; --rule:#031839;
  --on-dark:#E6EDF8; --on-dark-2:#8FA3C4; --dark-line:rgba(255,255,255,.14);
  --err:#C0281B; --err-bg:#FDF0EE; --warn:#6B4A00; --warn-bg:#FFF6DC; --warn-line:#E3BF55;
  --display:"Schibsted Grotesk",ui-sans-serif,system-ui,sans-serif;
  --ui:"Instrument Sans",ui-sans-serif,system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --r:2px; --wrap:1240px; --gut:clamp(18px,4vw,48px);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:var(--ui);font-size:17px;line-height:1.6;color:var(--ink);background:var(--bg);overflow-x:clip;-webkit-font-smoothing:antialiased;font-feature-settings:"ss01"}
img{max-width:100%;height:auto;display:block}
a{color:var(--cobalt-d);text-decoration-thickness:1px;text-underline-offset:.22em}
a:hover{color:var(--navy)}
:focus-visible{outline:2px solid var(--cobalt);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--display);color:var(--navy);margin:0 0 .5em;font-weight:700;letter-spacing:-.03em;line-height:1.02;text-wrap:balance}
h1{font-size:clamp(2.5rem,1.3rem + 4.6vw,5.4rem);letter-spacing:-.045em;font-weight:800}
h2{font-size:clamp(1.7rem,1.2rem + 1.8vw,2.7rem);letter-spacing:-.038em}
h3{font-size:1.2rem;letter-spacing:-.02em}
p{margin:0 0 1em}
code{font-family:var(--mono);font-size:.88em;color:var(--navy)}
.mono,.tnum{font-family:var(--mono);font-variant-numeric:tabular-nums}
.muted{color:var(--ink-3)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.sr-only{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--navy);color:#fff;padding:8px 14px;z-index:100}
.skip:focus{left:12px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

/* motif 3 — technical markers */
.kicker{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin:0 0 22px;display:flex;align-items:center;gap:12px}
.kicker span{color:var(--cobalt-d)}
.kicker span::after{content:"";display:inline-block;width:24px;height:1px;background:currentColor;vertical-align:middle;margin-left:12px}

/* ---------- Buttons ---------- */
.btn{font-family:var(--ui);font-weight:600;font-size:.95rem;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 18px;border-radius:var(--r);border:1px solid transparent;cursor:pointer;text-decoration:none;line-height:1.2;transition:background .18s var(--ease),border-color .18s,color .18s}
.btn-primary{background:var(--cobalt);color:#fff}
.btn-primary:hover{background:var(--cobalt-d);color:#fff}
.btn-go span{font-family:var(--mono);transition:transform .2s var(--ease)}
.btn-go:hover span{transform:translateX(4px)}
.btn-quiet{background:transparent;border-color:transparent;color:var(--navy);padding-left:4px;padding-right:4px;box-shadow:inset 0 -1px 0 var(--line);border-radius:0}
.btn-quiet:hover{box-shadow:inset 0 -2px 0 var(--navy);color:var(--navy)}
.btn-text{background:none;border:0;color:var(--cobalt-d)!important;padding:6px 0;font-weight:600;margin-top:10px}

/* ---------- Header ---------- */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hdr-in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut);height:64px;display:flex;align-items:center;gap:8px;position:relative}
.brand img{height:25px;width:auto}
.nav{display:flex;align-items:center;gap:0;margin-left:auto;margin-right:18px}
.nav>a,.nav>.dd>button{font-family:var(--ui);font-size:.93rem;font-weight:500;color:var(--ink-2);text-decoration:none;padding:8px 14px;background:none;border:0;cursor:pointer;display:flex;align-items:center;gap:6px;position:relative}
.nav>a::after,.nav>.dd>button::after{content:"";position:absolute;left:14px;right:14px;bottom:-13px;height:2px;background:var(--cobalt);transform:scaleX(0);transform-origin:left;transition:transform .22s var(--ease)}
.nav>a:hover,.nav>.dd>button:hover,.nav [aria-expanded=true]{color:var(--navy)}
.nav>a[aria-current=page]{color:var(--navy)}
.nav>a[aria-current=page]::after,.nav>.dd>button[aria-expanded=true]::after,.nav>a:hover::after{transform:scaleX(1)}
.hdr-cta{padding:10px 16px}
.chev{width:10px;height:10px;transition:transform .2s var(--ease)}
[aria-expanded=true]>.chev{transform:rotate(180deg)}
.dd{position:relative}
.dd-panel{position:absolute;top:calc(100% + 13px);left:-200px;width:720px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 30px 60px -30px rgba(3,24,57,.4),0 0 0 1px var(--line-2);animation:drop .18s var(--ease)}
.dd-panel::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--navy)}
.dd-panel[hidden]{display:none}
@keyframes drop{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.dd-grid{display:grid;grid-template-columns:repeat(3,1fr);padding:10px 0}
.dd-col{padding:14px 18px;border-right:1px solid var(--line-2)}
.dd-col:last-child{border-right:0}
.dd-g{font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-4);margin:0 0 8px}
.dd-col a{display:grid;grid-template-columns:28px 1fr;padding:9px 0;text-decoration:none;color:var(--navy);border-top:1px solid var(--line-2)}
.dd-col a:hover b,.dd-col a[aria-current=page] b{color:var(--cobalt-d)}
.dd-n{font-family:var(--mono);font-size:.72rem;color:var(--ink-4);padding-top:3px}
.dd-col b{display:block;font-family:var(--display);font-weight:600;font-size:.98rem;letter-spacing:-.015em;transition:color .15s}
.dd-col small{display:block;color:var(--ink-3);font-size:.8rem;line-height:1.35;margin-top:2px}
.dd-foot{display:flex;justify-content:space-between;align-items:center;padding:11px 18px;border-top:1px solid var(--line-2);font-family:var(--mono);font-size:.7rem;color:var(--ink-4);text-transform:uppercase;letter-spacing:.04em}
.dd-foot a{font-family:var(--ui);font-size:.85rem;font-weight:600;text-decoration:none;display:flex;gap:6px;align-items:center;text-transform:none;letter-spacing:0}
.menu-btn{display:none;margin-left:auto;background:none;border:0;width:44px;height:44px;cursor:pointer;position:relative;margin-right:-10px}
.menu-btn span{position:absolute;left:12px;right:12px;height:1.5px;background:var(--navy);transition:transform .22s var(--ease),top .22s var(--ease)}
.menu-btn span:first-child{top:18px}.menu-btn span:last-child{top:25px}
.menu-btn[aria-expanded=true] span:first-child{top:21.5px;transform:rotate(45deg)}
.menu-btn[aria-expanded=true] span:last-child{top:21.5px;transform:rotate(-45deg)}
.mnav{display:none}
@media (max-width:900px){
  .nav,.hdr-cta{display:none}
  .menu-btn{display:block}
  .mnav:not([hidden]){display:block;position:absolute;top:100%;left:0;right:0;background:#fff;box-shadow:0 30px 50px -24px rgba(3,24,57,.45);max-height:calc(100dvh - 64px);overflow:auto;padding:0 var(--gut) 20px;animation:drop .18s var(--ease);border-top:2px solid var(--navy)}
  .mx{display:flex;justify-content:space-between;align-items:center;width:100%;padding:16px 0 14px;font-family:var(--display);font-size:1.3rem;font-weight:700;letter-spacing:-.03em;color:var(--navy);border:0;border-bottom:1px solid var(--line);background:none;cursor:pointer;text-align:left}
  .mx-body{display:grid;grid-template-columns:1fr 1fr;gap:0 20px;padding:4px 0 14px}
  .mx-body[hidden]{display:none}
  .mg{grid-column:1/-1;font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt-d);margin:14px 0 2px}
  .mx-body a{padding:9px 0;color:var(--ink);text-decoration:none;font-size:.96rem;line-height:1.3;border-bottom:1px solid var(--line-2)}
  .mrow{display:flex;gap:28px;padding:16px 0 18px}
  .mrow a{font-family:var(--display);font-size:1.1rem;font-weight:600;color:var(--navy);text-decoration:none}
  .mnav .btn{width:100%}
}
@media (max-width:400px){.mx-body{grid-template-columns:1fr}}

/* ---------- Homepage hero: copy on paper, instrument on a navy field ---------- */
.hero{position:relative;background:var(--paper);overflow:hidden;border-bottom:1px solid var(--line)}
.hero-in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut);display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(40px,6vw,96px);align-items:stretch}
.hero-copy{padding:clamp(56px,8vw,112px) 0 clamp(72px,8vw,120px)}
.hero h1 em{font-style:normal;color:var(--cobalt);display:block}
.hero .lede{font-size:1.14rem;color:var(--ink-2);max-width:31em;margin:26px 0 32px}
.hero-actions{display:flex;flex-wrap:wrap;gap:18px 24px;align-items:center}
.facts{list-style:none;margin:36px 0 0;padding:16px 0 0;border-top:1px solid var(--line-2);display:flex;flex-wrap:wrap;gap:6px 0;font-family:var(--mono);font-size:.72rem;color:var(--ink-3);text-transform:uppercase;letter-spacing:.05em}
.facts li+li::before{content:"·";margin:0 12px;color:var(--ink-4)}
.console{position:relative;color:var(--on-dark);padding:clamp(40px,6vw,88px) 0 clamp(64px,7vw,104px) clamp(24px,3vw,48px);align-self:stretch;display:flex;flex-direction:column;justify-content:center}
.console::before{content:"";position:absolute;top:0;bottom:0;left:0;right:-100vw;background:var(--navy);z-index:0}
.console::after{content:"";position:absolute;top:0;bottom:0;left:0;right:-100vw;z-index:0;pointer-events:none;background:repeating-linear-gradient(90deg,rgba(255,255,255,.035) 0 1px,transparent 1px 48px)}
.console>*{position:relative;z-index:1}
.con-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-bottom:14px;border-bottom:1px solid var(--dark-line)}
.con-t{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-2)}
.seg{display:flex;gap:18px}
.seg button{font-family:var(--ui);font-size:.86rem;font-weight:500;color:var(--on-dark-2);background:none;border:0;padding:4px 0;cursor:pointer;white-space:nowrap;box-shadow:inset 0 -1px 0 transparent;transition:color .18s,box-shadow .18s}
.seg button:hover{color:#fff}
.seg button[aria-selected=true]{color:#fff;box-shadow:inset 0 -2px 0 var(--sky)}
.con-body{padding-top:6px}
.con-body [role=tabpanel][hidden]{display:none}
.readout{margin-top:28px}
.ro-k{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-2);margin:0}
.ro-v{font-family:var(--mono);font-weight:300;font-size:clamp(4.4rem,3rem + 5vw,7.4rem);letter-spacing:-.06em;line-height:1;margin:8px 0 0;color:#fff;font-variant-numeric:tabular-nums}
.ro-v small{font-size:.32em;font-weight:400;color:var(--sky);margin-left:8px;letter-spacing:0}
.ro-v.bad{color:#FFB4AB}.ro-v.good{color:var(--sky)}.ro-v.empty{color:var(--navy-3)}
.ro-l{font-size:.95rem;color:var(--on-dark);margin:0}
.con-link{display:inline-flex;align-items:center;gap:8px;margin-top:22px;color:var(--sky);font-weight:500;font-size:.9rem;text-decoration:none}
.con-link:hover{color:#fff}
.scale{position:absolute;left:0;right:0;bottom:0;height:30px;display:flex;justify-content:space-between;padding:0 var(--gut);max-width:var(--wrap);margin:0 auto;font-family:var(--mono);font-size:.6rem;color:var(--ink-4);pointer-events:none;z-index:2}
.scale span{width:1px;position:relative;display:flex;justify-content:center;border-left:1px solid var(--line)}
.scale span::after{content:attr(data-x)}
@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr;gap:0}
  .hero-copy{padding:44px 0 40px}
  .console{margin:0 calc(-1 * var(--gut));padding:32px var(--gut) 40px}
  .console::before,.console::after{right:0}
  .scale{display:none}
}

/* motif 1 — the score rail */
.rail{margin:22px 0 4px}
.meter,.ro-rule,.ix-rail{position:relative;height:16px;display:block;
  background:repeating-linear-gradient(90deg,currentColor 0 1px,transparent 1px 5%) bottom/100% 5px no-repeat,
             repeating-linear-gradient(90deg,currentColor 0 1px,transparent 1px 25%) bottom/100% 11px no-repeat,
             linear-gradient(currentColor,currentColor) bottom/100% 1px no-repeat;color:rgba(255,255,255,.28)}
.meter i,.ro-rule i,.ix-rail i{position:absolute;left:0;bottom:0;height:3px;background:var(--sky);transition:width .5s var(--ease)}
.meter i::after,.ro-rule i::after,.ix-rail i::after{content:"";position:absolute;right:-1px;bottom:0;width:2px;height:22px;background:#fff}
.rail-l{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.64rem;color:var(--on-dark-2);margin-top:6px}
.rail-l span{width:0;display:flex;justify-content:center}
.rail-l span:first-child{justify-content:flex-start}.rail-l span:last-child{justify-content:flex-end}
.ro-rule{margin:18px 0 14px}

/* motif 4 — ledger fields: label on the left, value on the right, on a rule */
.field{display:grid;grid-template-columns:minmax(0,1fr) minmax(128px,200px);grid-template-areas:"lab val" "hint val" "err err";column-gap:20px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line);position:relative}
.field>label{grid-area:lab;font-family:var(--ui);font-size:1rem;font-weight:600;color:var(--navy);align-self:end}
.field .hint{grid-area:hint;font-size:.82rem;color:var(--ink-3);line-height:1.4;align-self:start}
.field>.inp{grid-area:val}
.field>.ferr{grid-area:err;margin-top:8px}
.field::before{content:"";position:absolute;left:calc(-1 * min(var(--gut),22px));top:14px;bottom:14px;width:2px;background:var(--cobalt);transform:scaleY(0);transition:transform .2s var(--ease)}
.field:focus-within::before{transform:scaleY(1)}
.inp{position:relative;display:flex;align-items:center}
.inp input,.inp select{font-family:var(--mono);font-size:1.7rem;font-weight:400;letter-spacing:-.03em;font-variant-numeric:tabular-nums;width:100%;min-width:0;height:54px;padding:0 4px;border:0;border-bottom:2px solid var(--line);border-radius:0;background:transparent;color:var(--navy);text-align:right;transition:border-color .18s,background .18s;appearance:none;-moz-appearance:textfield}
.inp select{font-family:var(--ui);font-size:1rem;font-weight:600;letter-spacing:0;text-align:right;text-align-last:right;padding-right:22px;cursor:pointer;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10'%3E%3Cpath d='M1 3l4 4 4-4' fill='none' stroke='%23031839' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 4px center}
.inp input::placeholder{color:#B4BDCB;font-size:1.2rem}
.inp input:hover,.inp select:hover{border-bottom-color:var(--ink-4)}
.inp input:focus,.inp select:focus{outline:none;border-bottom-color:var(--cobalt);background:linear-gradient(transparent 70%,rgba(10,108,255,.06))}
.inp .unit{font-family:var(--mono);font-size:1rem;color:var(--ink-3);pointer-events:none;order:2;padding-left:8px;position:static}
.inp input.has-unit{padding-right:4px}
[aria-invalid=true]{border-bottom-color:var(--err)!important;background:linear-gradient(transparent 60%,var(--err-bg))!important;color:var(--err)!important}
.ferr{font-size:.84rem;color:var(--err);font-weight:500;display:flex;gap:8px;align-items:baseline;line-height:1.4}
.ferr:empty{display:none}
.ferr::before{content:"Error";font-family:var(--mono);font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;border:1px solid currentColor;padding:1px 5px}
.grid2{display:block}
.grid2+div,.ws-in form>div[style]{margin-top:0!important}
@media (max-width:420px){.field{grid-template-columns:minmax(0,1fr) 46%;column-gap:12px}.inp input{font-size:1.45rem}}
/* ledger on dark */
.console .field{border-bottom-color:var(--dark-line);padding:12px 0}
.console .field::before{background:var(--sky)}
.console .field>label{color:var(--on-dark);font-weight:500;font-size:.95rem}
.console .inp input{color:#fff;border-bottom-color:rgba(255,255,255,.2);font-size:1.45rem;height:44px}
.console .inp input:hover{border-bottom-color:rgba(255,255,255,.45)}
.console .inp input:focus{border-bottom-color:var(--sky);background:linear-gradient(transparent 70%,rgba(90,174,255,.1))}
.console .unit{color:var(--on-dark-2)}
.console .ferr{color:#FFB4AB}

.actions{display:flex;flex-wrap:wrap;gap:12px 22px;align-items:center;margin-top:28px}
.actions .btn-quiet{padding:12px 4px}
.save-note{margin-left:auto;font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-4)}
@media (max-width:520px){.save-note{margin-left:0;width:100%}}
input[type=range]{width:100%;accent-color:var(--sky);height:28px;margin:0}
input[type=checkbox]{width:18px;height:18px;accent-color:var(--cobalt);margin:0;flex:none}
.check{display:flex;align-items:center;gap:12px;padding:16px 0;border-bottom:1px solid var(--line);font-size:.95rem}
.check label{color:var(--navy);font-weight:500}
details.opt{border-bottom:1px solid var(--line)}
details.opt>summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;padding:16px 0;font-family:var(--ui);font-weight:600;color:var(--navy)}
details.opt>summary::-webkit-details-marker{display:none}
details.opt>summary::before{content:"+";font-family:var(--mono);width:16px;color:var(--cobalt-d);font-weight:500}
details.opt[open]>summary::before{content:"−"}
details.opt[open]{padding-bottom:18px}
details.opt .grid2 .field:first-child{border-top:1px solid var(--line-2)}
.scale-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(62px,1fr));gap:4px 14px}
.pt{display:flex;flex-direction:column;font-family:var(--mono);font-size:.72rem;color:var(--ink-3)}
.pt .inp input{font-size:1.05rem;height:38px;text-align:left;padding:0}

/* dynamic rows — a ruled sheet, not boxes */
.rows{display:flex;flex-direction:column}
.rowh,.row{display:grid;gap:14px;align-items:start}
.rowh{font-family:var(--mono);font-size:.66rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-4);padding:0 0 8px;border-bottom:1px solid var(--rule)}
.rowh span:nth-child(n+2):not(.type){text-align:right}
.row{border-bottom:1px solid var(--line);padding:6px 0}
.cell input,.cell select{font-family:var(--mono);font-size:1.15rem;font-variant-numeric:tabular-nums;width:100%;min-width:0;height:44px;padding:0 2px;border:0;border-bottom:2px solid transparent;border-radius:0;background:transparent;color:var(--navy);text-align:right;appearance:none;-moz-appearance:textfield;transition:border-color .18s,background .18s}
.cell input[data-k=name]{font-family:var(--ui);font-weight:600;font-size:1rem;text-align:left}
.cell select{font-family:var(--ui);font-weight:600;font-size:.98rem;text-align:right;text-align-last:right;padding-right:18px;cursor:pointer;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10'%3E%3Cpath d='M1 3l4 4 4-4' fill='none' stroke='%235F6B82' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 2px center}
.cell.type select{text-align:left;text-align-last:left}
.cell input::placeholder{color:#B4BDCB}
.cell input:hover,.cell select:hover{border-bottom-color:var(--line)}
.cell input:focus,.cell select:focus{outline:none;border-bottom-color:var(--cobalt);background:linear-gradient(transparent 70%,rgba(10,108,255,.06))}
.row .cell .ferr{margin-top:4px;font-size:.78rem}
.rm{width:36px;height:44px;border:0;background:none;color:var(--ink-4);cursor:pointer;display:grid;place-items:center;transition:color .15s}
.rm:hover{color:var(--err)}
.addrow{margin-top:0;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--cobalt-d);font-family:var(--ui);font-weight:600;font-size:.93rem;height:50px;width:100%;cursor:pointer;text-align:left;padding:0;display:flex;align-items:center;gap:10px}
.addrow:hover{color:var(--navy)}
.cols-grade{grid-template-columns:minmax(0,1.6fr) minmax(0,.9fr) minmax(0,.9fr) 36px}
.cols-gpa{grid-template-columns:minmax(0,1.5fr) minmax(0,.8fr) minmax(0,.7fr) minmax(0,1fr) 36px}
.cols-sem{grid-template-columns:minmax(0,1.6fr) minmax(0,.9fr) minmax(0,.8fr) 36px}
.cols-test{grid-template-columns:minmax(0,1.6fr) minmax(0,.9fr) minmax(0,.9fr) 36px}
[data-tool=gpa]:not(.is-weighted) .cols-gpa{grid-template-columns:minmax(0,1.6fr) minmax(0,.9fr) minmax(0,.8fr) 36px}
@media (max-width:620px){
  .rowh{display:none}
  .row,[data-tool=gpa]:not(.is-weighted) .row{grid-template-columns:1fr 1fr;padding:12px 0 14px;position:relative;gap:4px 18px}
  .rows .row:first-child{border-top:1px solid var(--rule)}
  .row .cell.name{grid-column:1/-1;padding-right:40px}
  .row .cell.type{grid-column:1/-1}
  .row .rm{position:absolute;top:12px;right:-6px}
  .row .cell[data-l]:not(.name)::before{content:attr(data-l);display:block;font-family:var(--mono);font-size:.64rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-4)}
  .row .cell:not(.name):not(.type) input,.row .cell:not(.name):not(.type) select{text-align:left;text-align-last:left}
}

/* ---------- Page header + method strip ---------- */
.phead{background:var(--paper);border-bottom:1px solid var(--line)}
.phead-in{padding-top:30px;padding-bottom:0}
.phead>.wrap:not(.phead-in){padding-top:30px;padding-bottom:40px}
.phead h1{font-size:clamp(2.3rem,1.3rem + 3.6vw,4.4rem);margin-bottom:.28em}
.phead .lede{font-size:1.1rem;color:var(--ink-2);max-width:40em;margin:0}
.crumbs{font-family:var(--mono);font-size:.7rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-4);margin-bottom:26px}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--line)}
.crumbs a{color:var(--ink-3);text-decoration:none}
.crumbs a:hover{color:var(--cobalt-d)}
.crumbs [aria-current]{color:var(--navy)}
.spec{margin:34px 0 0;display:grid;grid-template-columns:2fr 1fr 1fr;border-top:1px solid var(--line)}
.spec div{padding:12px 20px 14px 0;display:flex;flex-direction:column;gap:2px}
.spec div+div{padding-left:20px;border-left:1px solid var(--line-2)}
.spec dt{font-family:var(--mono);font-size:.64rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-4)}
.spec dd{margin:0;font-family:var(--mono);font-size:.84rem;color:var(--navy)}
@media (max-width:620px){.spec{grid-template-columns:1fr 1fr}.spec div:first-child{grid-column:1/-1}.spec div:nth-child(2){padding-left:0;border-left:0;border-top:1px solid var(--line-2)}.spec div:nth-child(3){border-top:1px solid var(--line-2)}}

/* ---------- Workspace ----------
   Two independent columns: inputs + working flow down the left, the navy
   output rail sits on the right and sticks. Rows never stretch to the rail. */
.ws{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.86fr);grid-template-rows:auto 1fr;grid-template-areas:"in res" "work res";column-gap:clamp(32px,5vw,80px);padding-top:44px;padding-bottom:16px}
.ws-in{grid-area:in}
.ws-work{grid-area:work;margin-top:56px}
.result{grid-area:res;align-self:start}
@media (min-width:901px) and (min-height:720px){.result{position:sticky;top:88px}}
@media (max-width:900px){
  .ws{grid-template-columns:1fr;grid-template-rows:auto;grid-template-areas:"in" "res" "work";padding-top:28px}
  .result{margin:40px calc(-1 * var(--gut)) 0}
  .ws-work{margin-top:44px}
}
.ws-h{display:flex;align-items:baseline;gap:14px;padding-bottom:12px;border-bottom:2px solid var(--rule)}
.ws-h h2{font-family:var(--mono);font-size:.76rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;margin:0;color:var(--navy)}
.ws-n{font-family:var(--mono);font-size:.76rem;color:var(--cobalt-d);font-weight:500}
.live{margin-left:auto;font-family:var(--mono);font-size:.64rem;text-transform:uppercase;letter-spacing:.08em;color:var(--on-dark-2);display:flex;align-items:center;gap:7px}
.live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--sky);animation:pulse 2.4s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

/* motif 6 — navy output rail */
.result{background:var(--navy);color:var(--on-dark);padding:26px clamp(20px,2.6vw,36px) 30px;position:relative}
.result::after{content:"";position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(90deg,rgba(255,255,255,.03) 0 1px,transparent 1px 48px)}
.result>*{position:relative;z-index:1}
.result .ws-h{border-bottom-color:rgba(255,255,255,.5)}
.result .ws-h h2{color:#fff}
.result .ws-n{color:var(--sky)}
.res-top{padding:28px 0 6px}
.res-k{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-2);margin:0 0 6px}
/* motif 2 — the readout numeral */
.res-v{font-family:var(--mono);font-weight:300;font-size:clamp(4.6rem,3rem + 4.4vw,7.6rem);letter-spacing:-.065em;line-height:.95;font-variant-numeric:tabular-nums;margin:0 0 0 -.04em;color:#fff;display:flex;align-items:baseline;flex-wrap:wrap;gap:0 10px}
.res-v small{font-size:max(.24em,1rem);font-weight:400;color:var(--sky);letter-spacing:0}
.res-v.empty{color:var(--navy-3)}
.state-bad .res-v,.state-bad .res-v small{color:#FFB4AB}
.state-good .res-v{color:var(--sky)}
.res-msg{margin:18px 0 0;font-size:1rem;color:var(--on-dark);line-height:1.5;max-width:30em}
.res-msg b{color:#fff;font-weight:600}
.pill{display:inline-block;font-family:var(--mono);font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;padding:3px 7px;border:1px solid rgba(255,255,255,.3);color:#fff;margin-top:14px}
.pill[hidden]{display:none}
.state-bad .pill{border-color:#FFB4AB;color:#FFB4AB}
.res-b{padding-top:14px}
.kv{margin:0;display:grid;grid-template-columns:1fr auto;border-top:1px solid var(--dark-line)}
.kv dt,.kv dd{padding:10px 0;border-bottom:1px solid var(--dark-line);font-size:.92rem;margin:0}
.kv dt{color:var(--on-dark-2)}
.kv dd{font-family:var(--mono);color:#fff;text-align:right;font-variant-numeric:tabular-nums}
.res-sec{margin-top:26px}
.res-sec h3,.res-sec h3 label{font-family:var(--mono);font-size:.68rem;font-weight:400;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-2);margin:0 0 8px}
.res-sec p,.res-b p{color:var(--on-dark)}
.res-b a{color:var(--sky)}
.fade-in{animation:fi .4s var(--ease)}
@keyframes fi{from{opacity:.15;transform:translateY(8px)}to{opacity:1;transform:none}}
/* tables on the rail */
.scen{width:100%;border-collapse:collapse;font-size:.9rem;font-variant-numeric:tabular-nums}
.scen th,.scen td{padding:9px 6px;text-align:right}
.scen td{font-family:var(--mono);font-size:.88rem;border-bottom:1px solid var(--dark-line);color:var(--on-dark)}
.scen th:first-child,.scen td:first-child{text-align:left;padding-left:0}
.scen th:last-child,.scen td:last-child{padding-right:0}
.scen th{font-family:var(--mono);font-size:.64rem;letter-spacing:.07em;text-transform:uppercase;color:var(--on-dark-2);font-weight:400;border-bottom:1px solid rgba(255,255,255,.4)}
.scen tr.cur td{color:#fff;font-weight:500;background:rgba(90,174,255,.1)}
.scen tr.cur td:first-child{box-shadow:inset 2px 0 0 var(--sky);padding-left:10px}
.tag{font-family:var(--mono);font-size:.64rem;text-transform:uppercase;letter-spacing:.05em}
.tag::before{content:"";display:inline-block;width:6px;height:6px;margin-right:6px;vertical-align:1px}
.tag-ok{color:var(--sky)}.tag-ok::before{background:var(--sky)}
.tag-no{color:#FFB4AB}.tag-no::before{border:1px solid #FFB4AB}
.tag-done{color:var(--on-dark-2)}.tag-done::before{background:var(--on-dark-2)}
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
/* grade chart lives in the light column */
.ws-in .scen td{color:var(--ink);border-bottom-color:var(--line-2)}
.ws-in .scen th{color:var(--ink-4);border-bottom-color:var(--rule)}
.ws-in .scen tr.cur td{color:var(--cobalt-d);background:var(--ice)}
.ws-in .scen tr.cur td:first-child{box-shadow:inset 2px 0 0 var(--cobalt)}
[data-sec-out]{font-size:.93rem}

/* motif 5 — the calculation sheet */
.work .res-sec{margin:0 0 30px}
.work .res-sec h3{color:var(--ink-3);border-bottom:1px solid var(--line);padding:18px 0 8px;margin:0}
.work p{color:var(--ink-2)}
.work a{color:var(--cobalt-d)}
.work-empty{color:var(--ink-4);font-size:.93rem;padding:18px 0;margin:0;font-family:var(--mono);font-size:.8rem}
.sheet{list-style:none;margin:0;padding:0;counter-reset:ln}
.sheet li{counter-increment:ln;display:grid;grid-template-columns:30px minmax(0,1fr) 22px auto;align-items:baseline;gap:0 8px;padding:9px 0;border-bottom:1px solid var(--line-2);font-family:var(--mono);font-size:.9rem;font-variant-numeric:tabular-nums}
.sheet li::before{content:counter(ln,decimal-leading-zero);font-size:.66rem;color:var(--ink-4)}
.sheet li.gap{padding:3px 0;border-bottom:1px solid var(--rule)}
.sheet li.gap::before{content:""}
.sheet .sh-e{color:var(--ink-2);min-width:0;overflow-wrap:anywhere}
.sheet .sh-q{color:var(--cobalt);text-align:center}
.sheet .sh-v{color:var(--navy);font-weight:500;text-align:right;white-space:nowrap}
.sheet li:last-child .sh-v{color:var(--cobalt-d);font-size:1.05rem}
.work ul{list-style:none;margin:0;padding:0;font-size:.93rem;color:var(--ink-2)}
.work li:not(.sheet li){padding:10px 0 10px 22px;border-bottom:1px solid var(--line-2);position:relative}
.work ul li::before{content:"";position:absolute;left:0;top:21px;width:10px;height:1px;background:var(--cobalt)}
.math{font-family:var(--mono);font-size:.88rem;white-space:pre-wrap;color:var(--on-dark)}

/* alerts — ruled notes, not boxes */
.alert{display:flex;gap:12px;padding:14px 0 14px 14px;font-size:.92rem;line-height:1.5;border-left:2px solid;margin:18px 0 0}
.alert[hidden]{display:none}
.alert .ic{flex:none;font-family:var(--mono);font-size:.7rem;font-weight:500;padding-top:2px;text-transform:uppercase}
.alert .ic::after{content:""}
.alert-warn{border-color:var(--warn-line);color:var(--warn);background:linear-gradient(90deg,var(--warn-bg),transparent)}
.alert-err{border-color:var(--err);color:#7A1B12;background:linear-gradient(90deg,var(--err-bg),transparent)}
.alert-info{border-color:var(--cobalt);color:var(--ink-2);background:none}
.alert-info .ic{color:var(--cobalt-d)}

/* ---------- Content ---------- */
.content{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:clamp(48px,7vw,120px);padding:clamp(64px,8vw,112px) 0 clamp(64px,8vw,112px);margin-top:64px;border-top:2px solid var(--rule);align-items:start}
@media (max-width:960px){.content{grid-template-columns:1fr;gap:56px;margin-top:40px}}
.prose{max-width:720px;min-width:0}
.prose>h2{margin-top:2.2em;font-size:clamp(1.6rem,1.2rem + 1.3vw,2.3rem)}
.prose>h2:first-child{margin-top:0}
.prose h3{margin-top:1.6em}
.prose p,.prose li{color:var(--ink-2)}
.prose ul,.prose ol{padding-left:1.1em}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--cobalt)}
.prose strong{color:var(--ink);font-weight:600}
.prose table{width:100%;border-collapse:collapse;font-size:.93rem;margin:1.4em 0 1.8em;font-variant-numeric:tabular-nums;border-top:2px solid var(--rule)}
.prose th,.prose td{text-align:left;padding:11px 10px 11px 0;border-bottom:1px solid var(--line);vertical-align:top}
.prose td{font-size:.92rem}
.prose td:first-child{font-weight:600;color:var(--navy)}
.prose th{font-family:var(--mono);font-size:.66rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-4);font-weight:400}
/* formula display */
.fx{margin:1.6em 0 1.8em;padding:22px 0;border-top:2px solid var(--rule);border-bottom:1px solid var(--line);display:grid;grid-template-columns:auto auto 1fr;gap:14px 18px;align-items:baseline;overflow-x:auto}
.fx-row{display:contents}
.fx-l{font-family:var(--display);font-weight:700;color:var(--navy);font-size:1.15rem;letter-spacing:-.02em;white-space:nowrap}
.fx-eq{font-family:var(--mono);color:var(--cobalt);font-size:1.1rem}
.fx-r{font-family:var(--mono);color:var(--ink);font-size:1.05rem;letter-spacing:-.01em}
.fx-row:not(:has(.fx-l)) .fx-r{grid-column:1/-1}
@media (max-width:560px){.fx{grid-template-columns:1fr;gap:2px}.fx-eq{display:none}.fx-r{margin-bottom:12px;font-size:.95rem}}
/* variables */
.vars{margin:-.6em 0 2em;display:grid;grid-template-columns:1fr 1fr;gap:0 28px}
.vars div{padding:10px 0;border-bottom:1px solid var(--line-2);display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:baseline}
.vars dt{font-family:var(--mono);font-size:.84rem;color:var(--cobalt-d);white-space:nowrap}
.vars dd{margin:0;font-size:.88rem;color:var(--ink-3);line-height:1.45}
@media (max-width:620px){.vars{grid-template-columns:1fr}}
/* worked example — an editorial calculation sheet */
.ex{margin:1.8em 0 2.2em;padding:0}
.ex figcaption{font-family:var(--mono);font-size:.7rem;letter-spacing:.07em;text-transform:uppercase;color:var(--navy);padding:0 0 10px;border-bottom:2px solid var(--rule);display:flex;gap:10px}
.ex figcaption::before{content:"Example";color:var(--cobalt-d)}
.ex-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.35fr) minmax(0,.75fr);border-bottom:1px solid var(--line)}
.ex-col{padding:16px 22px 18px;position:relative}
.ex-col:first-child{padding-left:0}
.ex-col:last-child{padding-right:0}
.ex-col+.ex-col{border-left:1px solid var(--line-2)}
.ex-col+.ex-col::before{content:"→";position:absolute;left:-7px;top:15px;background:var(--bg);color:var(--cobalt);font-family:var(--mono);font-size:.8rem;line-height:1;padding:2px 0}
.ex-k{font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-4);margin:0 0 10px}
.ex-in{list-style:none;margin:0;padding:0!important}
.ex-in li{display:flex;justify-content:space-between;gap:10px;font-size:.88rem;margin:0 0 6px;color:var(--ink-3)!important}
.ex-in b{font-family:var(--mono);font-weight:500;color:var(--navy);text-align:right;white-space:nowrap}
.ex-steps{margin:0;padding:0!important;list-style:none}
.ex-steps li{font-family:var(--mono);font-size:.84rem;color:var(--ink)!important;margin:0 0 6px;line-height:1.5}
.prose .ex-v{font-family:var(--mono);font-weight:300;font-size:2.6rem;letter-spacing:-.06em;color:var(--cobalt);margin:0;line-height:1}
.prose .ex-l{font-size:.8rem;color:var(--ink-3);margin:8px 0 0;line-height:1.35}
.ex-note{font-size:.88rem;color:var(--ink-3)!important;margin:10px 0 0}
@media (max-width:640px){.ex-grid{grid-template-columns:1fr}.ex-col{padding:14px 0}.ex-col+.ex-col{border-left:0;border-top:1px solid var(--line-2)}.ex-col+.ex-col::before{content:"↓";left:0;top:-8px;padding:0 6px 0 0}}
/* aside */
.aside{position:sticky;top:96px;display:flex;flex-direction:column;gap:32px}
@media (max-width:960px){.aside{position:static}}
.aside h2{font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-4);margin:0 0 10px;font-weight:400}
.rel{list-style:none;margin:0;padding:0;border-top:2px solid var(--rule)}
.rel a{display:block;padding:14px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--navy);font-family:var(--display);font-weight:700;letter-spacing:-.02em;font-size:1.05rem;transition:padding .2s var(--ease),color .2s}
.rel a small{display:block;color:var(--ink-3);font-family:var(--ui);font-weight:400;font-size:.86rem;letter-spacing:0}
.rel a:hover{color:var(--cobalt-d);padding-left:8px}
.note{font-size:.88rem;color:var(--ink-2);border-left:2px solid var(--cobalt);padding:2px 0 2px 16px}
.note b{color:var(--navy)}
/* FAQ */
.faq{border-top:2px solid var(--rule);margin-top:1em}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:20px 44px 20px 0;font-family:var(--display);font-weight:600;font-size:1.14rem;letter-spacing:-.02em;color:var(--navy);position:relative;display:block;transition:color .15s}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:18px;font-family:var(--mono);font-size:1.25rem;font-weight:300;color:var(--cobalt-d);transition:transform .25s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:hover{color:var(--cobalt-d)}
.faq details>div{padding:0 44px 22px 0;animation:fi .25s var(--ease)}
.faq details>div p:last-child{margin:0}

/* ---------- Homepage: index ---------- */
.sec{padding:clamp(72px,10vw,136px) 0}
.sec-intro{margin-bottom:40px}
.sec-intro h2{margin:0;font-size:clamp(2.2rem,1.3rem + 3.4vw,4rem);letter-spacing:-.05em;font-weight:800;max-width:14em}
.sec-intro h2 span{color:var(--ink-4)}
.index{list-style:none;margin:0;padding:0;border-top:2px solid var(--rule)}
.ix a{display:grid;grid-template-columns:88px minmax(0,1fr) minmax(0,.55fr) 32px;gap:24px;align-items:baseline;padding:26px 0 24px;border-bottom:1px solid var(--line);text-decoration:none;color:inherit;position:relative}
.ix a::before{content:"";position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--cobalt);transition:width .35s var(--ease)}
.ix a:hover::before{width:100%}
.ix-n{font-family:var(--mono);font-weight:300;font-size:2.2rem;letter-spacing:-.06em;color:var(--ink-4);line-height:1;transition:color .2s}
.ix a:hover .ix-n{color:var(--cobalt)}
.ix-g{display:block;font-family:var(--mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt-d);margin-bottom:6px}
.ix-t b{display:block;font-family:var(--display);font-size:clamp(1.4rem,1.1rem + .9vw,1.9rem);font-weight:700;letter-spacing:-.035em;color:var(--navy);line-height:1.1;transition:transform .25s var(--ease)}
.ix a:hover .ix-t b{transform:translateX(6px)}
.ix-d{display:block;color:var(--ink-3);font-size:.95rem;margin-top:8px;max-width:34em}
.ix-f{font-family:var(--mono);font-size:.78rem;color:var(--ink-3);text-align:right}
.ix-go{color:var(--cobalt-d);justify-self:end}
.ix-go svg{transition:transform .2s var(--ease)}
.ix a:hover .ix-go svg{transform:translateX(4px)}
.ix-feat a{grid-template-columns:88px minmax(0,1fr) minmax(0,.9fr) 32px;padding:34px 0 36px;align-items:center}
.ix-feat .ix-n{color:var(--cobalt);font-size:3rem}
.ix-feat .ix-t b{font-size:clamp(2rem,1.3rem + 2vw,3.2rem);letter-spacing:-.045em}
.ix-feat .ix-f{display:none}
.ix-demo{background:var(--navy);color:var(--on-dark);padding:20px 24px;display:block}
.ix-dv{display:block;font-family:var(--mono);font-weight:300;font-size:3.6rem;letter-spacing:-.06em;line-height:1;color:#fff}
.ix-dv small{font-size:.35em;color:var(--sky);margin-left:6px;font-weight:400}
.ix-rail{margin:14px 0 8px}
.ix-dl{display:block;font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.05em;color:var(--on-dark-2)}
@media (max-width:900px){
  .ix a,.ix-feat a{grid-template-columns:52px minmax(0,1fr) 24px;gap:14px}
  .ix-f{display:none}
  .ix-n{font-size:1.6rem}.ix-feat .ix-n{font-size:2rem}
  .ix-demo{grid-column:2/-1;grid-row:2}
}

/* workflow — a rail with four stations */
.flow{background:var(--tint);padding:clamp(64px,8vw,104px) 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.flow-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:2px solid var(--rule)}
.flow-steps li{position:relative;padding:26px 28px 0 0}
.flow-steps li::before{content:"";position:absolute;top:-8px;left:0;width:2px;height:14px;background:var(--rule)}
.flow-steps li:not(:last-child)::after{content:"→";position:absolute;right:18px;top:-13px;font-family:var(--mono);color:var(--cobalt);background:var(--tint);padding:0 6px;font-size:.9rem}
.flow-steps b{display:block;font-family:var(--display);font-size:clamp(2rem,1.3rem + 2.2vw,3.2rem);font-weight:800;letter-spacing:-.05em;color:var(--navy);margin:0 0 12px;line-height:1}
.flow-steps p{color:var(--ink-2);font-size:.95rem;max-width:17em}
.flow-steps a{font-weight:600;font-size:.9rem;margin-right:16px;text-decoration:none;box-shadow:inset 0 -1px 0 currentColor}
@media (max-width:860px){.flow-steps{grid-template-columns:1fr 1fr;row-gap:40px}.flow-steps li:nth-child(2)::after{display:none}}
@media (max-width:480px){.flow-steps{grid-template-columns:1fr;row-gap:28px;border-top:0}.flow-steps li{padding-top:18px;border-top:2px solid var(--rule)}.flow-steps li::after{display:none}.flow-steps li::before{display:none}}

/* derivation */
.think-in{display:grid;grid-template-columns:minmax(0,.75fr) minmax(0,1.25fr);gap:clamp(40px,7vw,120px);align-items:start}
.think-copy{position:sticky;top:110px}
.deriv{list-style:none;margin:0;padding:0;border-top:2px solid var(--rule);counter-reset:d}
.deriv li{counter-increment:d;display:grid;grid-template-columns:34px minmax(0,1fr) 30px minmax(120px,auto);grid-template-rows:auto auto;column-gap:10px;padding:24px 0 20px;border-bottom:1px solid var(--line);align-items:baseline}
.deriv li::before{content:counter(d,decimal-leading-zero);font-family:var(--mono);font-size:.7rem;color:var(--ink-4);grid-row:1}
.d-expr{white-space:nowrap;font-family:var(--mono);font-size:clamp(1rem,.8rem + .8vw,1.4rem);color:var(--ink-2);text-align:right}
.d-eq{font-family:var(--mono);color:var(--cobalt);text-align:center;font-size:1.2rem}
.d-val{font-family:var(--mono);font-weight:300;font-size:clamp(2rem,1.2rem + 2.4vw,3.4rem);letter-spacing:-.06em;color:var(--navy);font-variant-numeric:tabular-nums;line-height:1}
.d-val.hl{color:var(--cobalt)}
.d-note{grid-column:4;font-family:var(--mono);font-size:.66rem;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-3);margin-top:6px}
.d-check .d-val,.d-check .d-expr{color:var(--ink-4)}
@media (max-width:860px){.think-in{grid-template-columns:1fr}.think-copy{position:static}}
@media (max-width:520px){.deriv li{grid-template-columns:28px 1fr auto}.d-expr{text-align:left;grid-column:2/-1;font-size:.95rem;white-space:normal}.d-eq{display:none}.d-val{grid-column:2;grid-row:2;margin-top:8px}.d-note{grid-column:3;grid-row:2;text-align:right}}

/* question navigation */
.tasks-sec{background:var(--paper);border-top:1px solid var(--line)}
.tasks-in{display:grid;grid-template-columns:minmax(0,.6fr) minmax(0,1.4fr);gap:clamp(32px,6vw,96px);align-items:start}
.tasks{list-style:none;margin:0;padding:0;border-top:2px solid var(--rule)}
.tasks a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:baseline;padding:18px 0;border-bottom:1px solid var(--line);text-decoration:none}
.tasks a span{font-family:var(--display);font-size:clamp(1.1rem,.95rem + .6vw,1.45rem);font-weight:600;color:var(--navy);letter-spacing:-.025em;transition:color .2s}
.tasks a em{font-style:normal;font-family:var(--mono);font-size:.68rem;color:var(--ink-4);text-transform:uppercase;letter-spacing:.05em;transition:color .2s;white-space:nowrap}
.tasks a em::after{content:"  →";color:var(--cobalt)}
.tasks a:hover span,.tasks a:hover em{color:var(--cobalt-d)}
@media (max-width:860px){.tasks-in{grid-template-columns:1fr;gap:12px}}
@media (max-width:560px){.tasks a{grid-template-columns:1fr;gap:4px}}

/* trust */
.trust{padding:0;background:var(--paper)}
.trust-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.trust-list li{font-size:.92rem;color:var(--ink-2);line-height:1.5;padding:28px 24px 36px 0}
.trust-list li+li{padding-left:24px;border-left:1px solid var(--line-2)}
.trust-list span{display:block;font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.07em;color:var(--cobalt-d);margin-bottom:10px}
@media (max-width:860px){.trust-list{grid-template-columns:1fr 1fr}.trust-list li:nth-child(3){padding-left:0;border-left:0}.trust-list li:nth-child(n+3){border-top:1px solid var(--line-2)}}
@media (max-width:480px){.trust-list{grid-template-columns:1fr}.trust-list li,.trust-list li+li{padding:20px 0;border-left:0;border-top:1px solid var(--line-2)}}

/* ---------- Footer ---------- */
.ftr{background:var(--paper);border-top:2px solid var(--rule);padding:64px 0 26px}
.ftr-top{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:48px;align-items:end}
.ftr-brand img{width:min(100%,420px);height:auto}
.ftr-state{margin:0;font-family:var(--display);font-size:clamp(1.5rem,1.1rem + 1.4vw,2.3rem);font-weight:700;letter-spacing:-.04em;line-height:1.1;color:var(--navy)}
.ftr-state span{color:var(--ink-4)}
.ftr-rule{display:flex;justify-content:space-between;height:10px;margin:48px 0 0;border-bottom:1px solid var(--rule)}
.ftr-rule span{width:1px;background:var(--rule)}
.ftr-rule span:nth-child(odd){height:10px}.ftr-rule span:nth-child(even){height:5px;margin-top:5px;background:var(--line)}
.ftr-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;padding:36px 0 44px}
.ftr h2{font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt-d);margin:0 0 16px;font-weight:500}
.ftr ul{list-style:none;margin:0;padding:0}
.ftr li{margin-bottom:10px;font-size:.95rem}
.ftr a{color:var(--ink-2);text-decoration:none;transition:color .15s}
.ftr a:hover{color:var(--navy);text-decoration:underline}
.ftr-bot{display:flex;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;padding-top:18px;border-top:1px solid var(--line);color:var(--ink-4);font-size:.8rem}
.ftr-bot .mono{font-size:.68rem;text-transform:uppercase;letter-spacing:.05em}
@media (max-width:860px){.ftr{padding-top:48px}.ftr-top{grid-template-columns:1fr;gap:24px}.ftr-brand img{width:min(100%,300px)}.ftr-rule{margin-top:36px}.ftr-grid{grid-template-columns:1fr 1fr;gap:28px 20px}}

/* ---------- Simple pages ---------- */
.page{padding-top:clamp(40px,6vw,80px);padding-bottom:96px}
.page .prose{max-width:740px}
.toc{margin:0 0 3em}
.toc ol{list-style:none;margin:0;padding:0!important;border-top:2px solid var(--rule)}
.toc li{margin:0}
.toc a{display:grid;grid-template-columns:44px 1fr;padding:13px 0;border-bottom:1px solid var(--line);text-decoration:none;font-family:var(--display);font-weight:600;font-size:1.1rem;letter-spacing:-.02em;color:var(--navy)}
.toc a span{font-family:var(--mono);font-weight:300;color:var(--cobalt)}
.toc a:hover{color:var(--cobalt-d)}
.gn{display:block;font-family:var(--mono);font-weight:300;font-size:.9rem;letter-spacing:0;color:var(--cobalt);margin-bottom:10px}
.err404{padding-top:clamp(64px,10vw,128px);padding-bottom:clamp(64px,10vw,128px)}
.err404 .code{font-family:var(--mono);font-weight:300;font-size:clamp(6rem,16vw,11rem);color:var(--navy);letter-spacing:-.08em;line-height:.9;margin:0 0 24px}
.err404 .code span{color:var(--cobalt)}

/* Ad slots: invisible until a real unit is inserted. Placed only between
   content sections — never beside inputs, results or navigation. */
.ad-slot:empty{display:none}
.ad-slot{margin:48px 0;padding-top:10px;border-top:1px solid var(--line-2)}
.ad-slot::before{content:"Advertisement";display:block;font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-4);margin-bottom:8px}

@media print{.hdr,.ftr,.actions,.aside,.addrow,.rm,.ad-slot,.live{display:none!important}.result{background:#fff;color:#000;border:1px solid #000}.res-v,.res-msg,.kv dd,.kv dt{color:#000!important}body{background:#fff}.ws{display:block}}
@media (min-width:901px) and (min-height:720px){.ws .result{position:sticky;top:88px}}
.sheet li.gap{counter-increment:none}
@media (max-width:900px){.ix-feat a{align-items:start}}