@font-face{font-family:"Schibsted Grotesk";src:url(fonts/schibsted-grotesk.woff2) format("woff2");font-weight:400 900;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-500.woff2) format("woff2");font-weight:500;font-display:swap}

/* Strip-chart paper, ink, and the international orange of flight recorders. */
:root{
  --paper:#f2eee4; --paper-2:#ebe5d8; --grid:#ddd5c4; --grid-strong:#cbc1ad;
  --ink:#1d1b17; --ink-2:#4f493f; --muted:#6a6355;
  --orange:#e2470e; --orange-ink:#b3370a; --orange-wash:rgba(226,71,14,.10);
  --ok:#2f5d3a; --line:#d4cbb8;
  --display:"Schibsted Grotesk",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --text:"Schibsted Grotesk",system-ui,sans-serif;
  --t-fast:140ms; --t:220ms; --ease:cubic-bezier(.2,.7,.2,1);
  --radius:6px; --gutter:clamp(16px,4vw,40px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#13120f; --paper-2:#1b1915; --grid:#26231d; --grid-strong:#36322a;
    --ink:#ece6d8; --ink-2:#c3bba9; --muted:#9a927f;
    --orange:#ff6a2b; --orange-ink:#ff8a57; --orange-wash:rgba(255,106,43,.13);
    --ok:#8fc79c; --line:#2f2b24;
    color-scheme:dark;
  }
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 var(--text);
  font-kerning:normal;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--orange-ink)}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:3px}
h1,h2,h3{line-height:1.15;margin:0}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 12px;border-radius:var(--radius);z-index:10}
.skip:focus{left:8px}

/* Top bar */
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px var(--gutter);background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.mark{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 19px/1 var(--display);letter-spacing:-.02em}
.mark-glyph{width:26px;height:26px;flex:0 0 auto;fill:none}
.top nav{display:flex;gap:4px}
.top nav a{font:500 14px/1 var(--display);text-decoration:none;padding:9px 10px;border-radius:var(--radius);
  transition:background var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.top nav a:hover{background:var(--paper-2);color:var(--ink)}
.top nav a:active{transform:scale(.97)}

main{max-width:1120px;margin:0 auto;padding:0 var(--gutter)}
section{padding:72px 0;border-bottom:1px solid var(--line)}
section:last-child{border-bottom:0}
h2{font:600 clamp(22px,2.6vw,28px)/1.2 var(--display);letter-spacing:-.02em;margin-bottom:28px}
h3{font:700 17px/1.3 var(--text)}
.fine{color:var(--muted);font-size:14px;max-width:70ch;margin:24px 0 0}

/* Hero */
.hero{padding-top:56px}
.hero h1{font:700 clamp(30px,4.6vw,54px)/1.06 var(--display);letter-spacing:-.03em;max-width:21ch}
.hero h1 span{color:var(--orange-ink)}
.lede{max-width:62ch;color:var(--ink-2);margin:20px 0 36px;font-size:18px}
.lede em{font-style:normal;font-weight:700;color:var(--ink)}

/* Incident picker: one sliding ink bar, FLIP-animated by app.js */
.picker{position:relative;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;
  border-bottom:1px solid var(--grid-strong);margin-bottom:0}
.picker::-webkit-scrollbar{display:none}
.picker button{flex:0 0 auto;appearance:none;border:0;background:none;color:var(--muted);cursor:pointer;
  font:500 14px/1 var(--display);padding:14px 14px 15px;border-radius:var(--radius) var(--radius) 0 0;min-height:44px;
  transition:color var(--t-fast) var(--ease),background var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.picker button:hover{background:var(--paper-2);color:var(--ink)}
.picker button:active{transform:scale(.97)}
.picker button[aria-selected=true]{color:var(--ink)}
.picker-ink{position:absolute;bottom:-1px;left:0;height:3px;width:0;background:var(--orange);border-radius:2px;
  transform-origin:left;transition:transform var(--t) var(--ease),width var(--t) var(--ease)}

/* The tape */
.tape-wrap{margin:0;background:var(--paper-2);border:1px solid var(--grid-strong);border-top:0;
  border-radius:0 0 var(--radius) var(--radius);padding:16px 16px 18px}
.tape-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:12px}
.tape-what{margin:0;font-size:15px;color:var(--ink-2);max-width:72ch}
.tape-what strong{color:var(--ink)}
.replay-btn{flex:0 0 auto;appearance:none;cursor:pointer;font:500 13px/1 var(--display);color:var(--ink);
  background:transparent;border:1px solid var(--grid-strong);border-radius:var(--radius);padding:9px 12px;min-height:36px;
  transition:background var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.replay-btn:hover{background:var(--paper)}
.replay-btn:active{transform:scale(.97)}
.tape{--gutter-lane:86px;position:relative;height:236px;cursor:crosshair;touch-action:pan-y;border-radius:4px;
  background:
    repeating-linear-gradient(90deg,transparent 0 47px,var(--grid) 47px 48px),
    var(--paper)}
.tape svg{position:absolute;top:0;bottom:0;left:var(--gutter-lane);right:10px;width:calc(100% - var(--gutter-lane) - 10px);height:100%;overflow:visible}
.lane-names{position:absolute;top:0;bottom:0;pointer-events:none}
.lane-names{width:calc(var(--gutter-lane) - 8px);left:0;border-right:1px solid var(--grid-strong);background:var(--paper)}
.lane-names span{position:absolute;left:10px;transform:translateY(-50%);font:500 11px/1 var(--display);color:var(--muted)}
.cursor{position:absolute;top:0;bottom:0;width:1px;background:var(--ink);opacity:0;pointer-events:none;
  transition:opacity var(--t-fast) var(--ease)}
.tape.reading .cursor{opacity:.55}
.tape-help{font-size:13px;color:var(--muted);margin:10px 0 0}
.readout{display:block;min-height:3.2em;margin-top:8px;font:400 13px/1.55 var(--mono);color:var(--ink-2);
  border-left:3px solid var(--grid-strong);padding:4px 0 4px 12px;transition:border-color var(--t-fast) var(--ease)}
.readout.bad{border-left-color:var(--orange)}
.readout b{color:var(--ink);font-weight:600}

/* SVG marks */
.lane-rule{stroke:var(--grid-strong);stroke-width:1}
.m-ok{stroke:var(--ink);stroke-opacity:.28;stroke-width:1.4}
.m-info{stroke:var(--ink);stroke-width:2}
.m-bad{stroke:var(--orange);stroke-width:3;stroke-linecap:round}
.m-hit{stroke:var(--orange);stroke-width:7;stroke-opacity:.0;transition:stroke-opacity var(--t) var(--ease)}
.m-hit.on{stroke-opacity:.35}
.splice-line{stroke:var(--ink);stroke-width:1.5;stroke-dasharray:3 4}
.splice-text,.window-text{font:500 11px var(--display);fill:var(--muted)}
.window{fill:var(--orange-wash)}
.pen{stroke:var(--orange);stroke-width:1.5}

/* Verdict ledger */
.verdict{margin-top:28px;display:grid;gap:0}
.v-conclusion{font:600 clamp(18px,2.2vw,22px)/1.3 var(--display);letter-spacing:-.02em;margin:0 0 6px}
.v-conclusion .word{color:var(--orange-ink)}
.v-conclusion .word.unknown{color:var(--ink);text-decoration:underline;text-decoration-color:var(--orange);text-decoration-thickness:3px;text-underline-offset:5px}
.v-reason{color:var(--ink-2);margin:0 0 18px;max-width:75ch}
.v-row{display:grid;grid-template-columns:7.5rem 1fr;gap:6px 18px;padding:14px 0;border-top:1px solid var(--line);
  opacity:0;transform:translateY(4px);animation:rise var(--t) var(--ease) forwards}
.v-tag{font:600 13px/1.5 var(--display)}
.v-tag.supported{color:var(--orange-ink)}
.v-tag.possible{color:var(--ink)}
.v-tag.ruled_out{color:var(--muted);text-decoration:line-through;text-decoration-thickness:1px}
.v-title{font-weight:700;margin:0}
.v-title small{font:400 12px var(--mono);color:var(--muted);margin-left:8px}
.v-text{margin:4px 0 0;color:var(--ink-2);max-width:78ch}
.cite{appearance:none;border:0;background:var(--orange-wash);color:var(--orange-ink);font:500 12.5px/1 var(--mono);
  padding:3px 5px;border-radius:3px;cursor:pointer;transition:background var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.cite:hover,.cite:focus-visible{background:var(--orange);color:var(--paper)}
.cite:active{transform:scale(.95)}
.v-missing{margin:8px 0 0;font-size:14px;color:var(--muted)}
.v-missing b{font-weight:700;color:var(--ink-2)}
.blind{margin-top:18px;padding:14px 16px;border:1px dashed var(--grid-strong);border-radius:var(--radius);font-size:15px}
.blind h3{font:600 14px/1.3 var(--display);margin-bottom:6px}
.blind ul{margin:0;padding-left:18px;color:var(--ink-2)}
@keyframes rise{to{opacity:1;transform:none}}

/* How */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:28px;counter-reset:s}
.steps li{counter-increment:s;border-top:2px solid var(--ink);padding-top:14px}
.steps li::before{content:counter(s,decimal-leading-zero);font:500 12px var(--display);color:var(--orange-ink);display:block;margin-bottom:8px}
.steps p{margin:8px 0 0;color:var(--ink-2);font-size:16px}
.diagram{margin-top:44px;overflow-x:auto}
.diagram svg{width:100%;min-width:640px;height:auto}
.d-src text,.d-label{font:500 13px var(--display);fill:var(--ink)}
.d-sub{font:400 11px var(--display);fill:var(--muted)}
.d-line{fill:none;stroke:var(--grid-strong);stroke-width:1.5}
.d-line.dashed{stroke-dasharray:4 4}
.d-box{fill:var(--paper-2);stroke:var(--grid-strong)}
.d-box.accent{stroke:var(--orange);stroke-width:1.5}

/* Measured ledger */
.ledger{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:0;border-top:2px solid var(--ink)}
.ledger div{padding:18px 18px 18px 0;border-bottom:1px solid var(--line)}
.ledger dt{font:400 14px/1.4 var(--text);color:var(--ink-2)}
.ledger dd.how{order:0;font:400 12px var(--display);margin:6px 0 0}
.ledger dd{margin:0 0 6px;font:600 clamp(26px,3vw,34px)/1.1 var(--display);letter-spacing:-.03em;order:-1}
.ledger div{display:flex;flex-direction:column}
.ledger a{font:400 12px var(--display);color:var(--muted);margin-top:6px}

/* Status */
.status-cols{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.status-cols h3{font:600 15px var(--display);margin-bottom:10px}
.status-cols ul{margin:0;padding:0;list-style:none}
.status-cols li{padding:9px 0;border-top:1px solid var(--line);color:var(--ink-2)}
#status-not li{color:var(--muted)}

.foot{max-width:1120px;margin:0 auto;padding:28px var(--gutter) 48px;font-size:13px;color:var(--muted)}
.noscript{padding:16px var(--gutter)}

@media (max-width:860px){
  .steps{grid-template-columns:1fr 1fr}
  .ledger{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  body{font-size:16px}
  .top nav a:not(:first-child){display:none}
  .steps,.ledger,.status-cols{grid-template-columns:1fr}
  .v-row{grid-template-columns:1fr}
  .tape{height:212px;--gutter-lane:74px}
  section{padding:52px 0}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:1ms!important;animation-delay:0ms!important;transition-duration:1ms!important;scroll-behavior:auto!important}
}

/* ---------- Motion: one recorder pass, then stillness ---------- */
/* SVG transforms use user units: the pen travels the tape's 1000-unit width. */
.pen{animation:pen 1400ms cubic-bezier(.33,1,.68,1) forwards}
@keyframes pen{0%{transform:translateX(0);opacity:1}92%{opacity:1}100%{transform:translateX(var(--pen-w));opacity:0}}
.ink{transform-box:fill-box;transform-origin:center;transform:scaleY(0);animation:ink 260ms cubic-bezier(.2,.8,.2,1) forwards}
.m-bad.ink{animation:kick 420ms cubic-bezier(.3,1.4,.4,1) forwards}
@keyframes ink{to{transform:scaleY(1)}}
@keyframes kick{0%{transform:scaleY(0)}55%{transform:scaleY(1.35)}100%{transform:scaleY(1)}}
.cursor{transition:opacity var(--t-fast) var(--ease),transform 160ms var(--ease)}
.m-hit.on{animation:hit 520ms var(--ease)}
@keyframes hit{0%{stroke-opacity:.6}100%{stroke-opacity:.35}}

/* Ruled out: the strike is drawn across after the row lands, like a pen line. */
.v-tag.ruled_out{text-decoration:none;background:linear-gradient(currentColor,currentColor) 0 55%/0 1px no-repeat;
  animation:strike 380ms var(--ease) forwards;animation-delay:inherit}
.v-row .v-tag.ruled_out{animation-delay:calc(var(--d,0ms) + 240ms)}
@keyframes strike{to{background-size:100% 1px}}
/* The verdict word settles in after the rows begin. */
.v-conclusion .word{display:inline-block;animation:settle 320ms var(--ease) both}
@keyframes settle{from{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}

/* Header mark traces itself once. */
/* Header mark: the lanes record left to right once, then the splice lands. */
.mark-glyph .lanes{clip-path:inset(0 100% 0 0);animation:record 700ms var(--ease) 120ms forwards}
.mark-glyph .splice{opacity:0;animation:appear 160ms linear 760ms forwards}
@keyframes record{to{clip-path:inset(0 0 0 0)}}
@keyframes trace{to{stroke-dashoffset:0}}
@keyframes appear{to{opacity:1}}
@media (prefers-reduced-motion:reduce){
  .ink,.m-bad.ink{transform:none}
  .v-tag.ruled_out{background-size:100% 1px}
  .mark-glyph .lanes{clip-path:none}
  .mark-glyph .splice{opacity:1}
}
.v-tag{justify-self:start;align-self:start}
.picker{mask-image:linear-gradient(90deg,#000 calc(100% - 48px),transparent);-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 48px),transparent);padding-right:40px}
.tape-labels{position:absolute;inset:0;pointer-events:none}
.tape-label{position:absolute;font:500 11px/1 var(--display);color:var(--muted);white-space:nowrap}
@media (max-width:560px){.tape{--gutter-lane:84px}.lane-names span{left:8px;font-size:10.5px}}
.tape-what .full{font:500 13px var(--display);white-space:nowrap;margin-left:4px}

/* Download links: one primary, one text link (same press/focus grammar as the rest). */
.get{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin:28px 0 0}
.get a{font:600 15px/1 var(--display);text-decoration:none}
.get a:not(.get-primary){text-decoration:underline;text-underline-offset:3px}
.get-primary{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border-radius:var(--radius);
  background:var(--ink);color:var(--paper)!important;transition:transform var(--t-fast) var(--ease),background var(--t-fast) var(--ease)}
.get-primary:hover{background:var(--orange-ink)}
.get-primary:active{transform:scale(.97)}
.get-hero{margin:-12px 0 40px}