/* ulteriorsafety.com v4 — follows DESIGN.md (approved 2026-10-26). Depth = background contrast only. */
@font-face{font-family:"Schibsted Grotesk";src:url(/assets/fonts/schibsted-grotesk-latin.woff2) format("woff2");font-weight:400 900;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url(/assets/fonts/source-serif-4-latin.woff2) format("woff2");font-weight:200 900;font-display:swap}

:root{
  --action:#1A44C2; --action-strong:#14369C; --action-on-night:#8FA8F0;
  --danger:#B3261E; --danger-on-night:#F2877F;
  --ink:#15171D; --ink-muted:#4A4F5C; --rule:#D5D8DF; --bar-other:#A9AEBA;
  --paper:#FAFAFB; --surface:#EEF0F3; --sunk:#E3E6EB;
  --on-action:#F5F6F8; --field:#FAFAFB; --field-rule:#9AA0AC;
  --night:#111318; --night-raised:#1B1E25; --on-night:#ECEEF2; --on-night-muted:#B4B9C4; --night-rule:#2E323C;
  --display:"Schibsted Grotesk",ui-sans-serif,sans-serif;
  --read:"Source Serif 4",Georgia,serif;
  /* type scale x1.25, base 18 */
  --t-1:14.4px; --t0:18px; --t1:22.5px; --t2:28.1px; --t3:35.2px; --t4:44px; --t5:55px; --t6:68.7px; --t7:85.8px;
  --wrap:1200px; --gut:clamp(20px,4vw,40px);
}

/* dark mode: its own palette (not an inversion). Follows the device setting; the header button overrides it. */
:root[data-theme=dark]{color-scheme:dark;
  --action:#8FA8F0; --action-strong:#B4C5F5; --on-action:#111318; --action-on-night:#8FA8F0;
  --danger:#F2877F; --danger-on-night:#F2877F;
  --ink:#E6E8EC; --ink-muted:#A9AFBB; --rule:#31353E; --bar-other:#5C6270;
  --paper:#15171C; --surface:#1C1F25; --sunk:#23262D; --field:#1C1F25; --field-rule:#6B717E;
  --night:#0B0C0F; --night-raised:#191C22; --night-rule:#2E323C;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;
  --action:#8FA8F0; --action-strong:#B4C5F5; --on-action:#111318; --action-on-night:#8FA8F0;
  --danger:#F2877F; --danger-on-night:#F2877F;
  --ink:#E6E8EC; --ink-muted:#A9AFBB; --rule:#31353E; --bar-other:#5C6270;
  --paper:#15171C; --surface:#1C1F25; --sunk:#23262D; --field:#1C1F25; --field-rule:#6B717E;
  --night:#0B0C0F; --night-raised:#191C22; --night-rule:#2E323C;
}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 var(--t0)/1.55 var(--read);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,.ui{font-family:var(--display);font-weight:700;letter-spacing:-.01em;line-height:1.1;margin:0;text-wrap:balance}
h1{font-size:clamp(var(--t5),7.2vw,var(--t7));letter-spacing:-.03em;line-height:1.02}
h2{font-size:clamp(var(--t3),4.4vw,var(--t4));letter-spacing:-.025em}
h3{font-size:var(--t1);font-weight:600}
p{margin:0 0 1em;max-width:66ch}
p:last-child{margin-bottom:0}
a{color:var(--action);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--action);outline-offset:2px}
.night :focus-visible{outline-color:var(--action-on-night)}
img,svg{display:block;max-width:100%}
ul,ol{margin:0;padding:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:-999px;top:8px;background:var(--paper);padding:8px 12px;z-index:10;font-family:var(--display)}
.skip:focus{left:8px}

/* tiles: full-bleed, radius 0, separated by colour only */
.tile{padding:clamp(88px,11vw,160px) 0}
.tile.tight{padding:clamp(64px,8vw,112px) 0}
.tile.surface{background:var(--surface)}
.tile.sunk{background:var(--sunk)}
.night{background:var(--night);color:var(--on-night)}
.night a{color:var(--action-on-night)}
.muted{color:var(--ink-muted)}
.night .muted{color:var(--on-night-muted)}
.small{font-size:var(--t-1);line-height:1.5}
.lead{font-size:var(--t1);line-height:1.5}
.sans{font-family:var(--display)}

/* header */
.top{background:var(--paper);position:sticky;top:0;z-index:5;border-bottom:1px solid transparent}
.top.scrolled{border-bottom-color:var(--rule)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-family:var(--display);font-weight:700;font-size:var(--t0);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand svg{width:22px;height:22px;stroke:var(--action)}
.nav{display:flex;gap:28px;font-family:var(--display);font-size:var(--t-1)}
.nav a{color:var(--ink);text-decoration:none}
.nav a:hover,.nav a[aria-current]{text-decoration:underline;text-underline-offset:.3em}
.menu{display:none;font:600 var(--t-1) var(--display);background:none;border:0;color:var(--ink);padding:8px 0;cursor:pointer}
@media (max-width:760px){
  .menu{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--paper);flex-direction:column;gap:0;padding:8px var(--gut) 24px;border-bottom:1px solid var(--rule)}
  .nav.open{display:flex}
  .nav a{padding:12px 0;font-size:var(--t0)}
}

.theme{font:600 var(--t-1) var(--display);background:none;border:1px solid var(--rule);color:var(--ink);border-radius:999px;padding:6px 14px;cursor:pointer;transition:border-color .15s ease-out}
.theme:hover{border-color:var(--ink-muted)}
.top-r{display:flex;align-items:center;gap:28px}
@media (max-width:760px){.top-r{gap:16px}}

/* buttons: one primary per screen */
.btn{display:inline-block;font:600 var(--t0)/1 var(--display);letter-spacing:-.005em;background:var(--action);color:var(--on-action);text-decoration:none;padding:15px 26px;border-radius:999px;border:0;cursor:pointer;transition:background-color .15s ease-out}
.btn:hover{background:var(--action-strong);text-decoration:none}
.night .btn{background:var(--on-night);color:var(--night)}
.night .btn:hover{background:#D3D7DF}
.link{font:600 var(--t0)/1 var(--display);color:var(--action);text-decoration:none}
.link:hover{text-decoration:underline}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px 32px;margin-top:40px}

/* hero */
.hero{padding:clamp(56px,7vw,96px) 0 clamp(80px,9vw,120px)}
.hero h1{max-width:12em;font-size:clamp(var(--t4),7.4vw,var(--t7))}
.hero .lead{margin-top:32px;max-width:40ch;font-size:var(--t1)}
.hero-row{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:end}
.hero-note{font-family:var(--display);font-size:var(--t-1);color:var(--ink-muted);border-top:1px solid var(--rule);padding-top:12px;max-width:32ch;justify-self:end}
@media (max-width:860px){.hero-row{grid-template-columns:1fr}.hero-note{justify-self:start}}

/* page intro (inner pages) */
.intro{padding:clamp(56px,7vw,96px) 0 clamp(48px,6vw,80px)}
.intro h1{font-size:clamp(var(--t4),6vw,var(--t6));max-width:20ch}
.intro .lead{margin-top:28px;max-width:54ch}
.intro .actions{margin-top:32px}

/* section heads: left, asymmetric — heading left, note right */
.head{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:24px 64px;align-items:end;margin-bottom:56px}
.head p{color:var(--ink-muted);margin:0}
.night .head p{color:var(--on-night-muted)}
.head.solo{grid-template-columns:1fr}
@media (max-width:860px){.head{grid-template-columns:1fr}}

/* demo */
.demo-head{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:24px 64px;align-items:end;margin-bottom:48px}
@media (max-width:860px){.demo-head{grid-template-columns:1fr}}
.demo{background:var(--night-raised);border-radius:8px;overflow:hidden}
.demo-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;padding:16px 24px;border-bottom:1px solid var(--night-rule);font-family:var(--display);font-size:var(--t-1)}
.seg{display:flex;gap:4px}
.seg button{font:600 var(--t-1) var(--display);color:var(--on-night-muted);background:none;border:1px solid transparent;border-radius:999px;padding:7px 14px;cursor:pointer;transition:color .15s ease-out,border-color .15s ease-out}
.seg button:hover{color:var(--on-night)}
.seg button[aria-pressed=true]{color:var(--on-night);border-color:var(--night-rule)}
.play{font:600 var(--t-1) var(--display);color:var(--night);background:var(--on-night);border:0;border-radius:999px;padding:8px 18px;cursor:pointer;transition:background-color .15s ease-out}
.play:hover{background:#D3D7DF}
.demo-grid{display:grid;grid-template-columns:1fr 1fr}
.demo-col{padding:32px 32px 36px}
.demo-col+.demo-col{border-left:1px solid var(--night-rule)}
@media (max-width:860px){.demo-grid{grid-template-columns:1fr}.demo-col+.demo-col{border-left:0;border-top:1px solid var(--night-rule)}.demo-col{padding:24px}}
.demo-label{font-family:var(--display);font-size:var(--t-1);color:var(--on-night-muted);margin:0 0 16px}
.spk{display:block;font-family:var(--display);font-size:var(--t-1);color:var(--on-night-muted);margin-bottom:4px}
.prompt{font-size:var(--t1);line-height:1.45;margin:0 0 28px}
.reply{font-size:var(--t0);line-height:1.6;min-height:7.5em;margin:0}
.reply .w{display:none}
.reply .w.on{display:inline;color:var(--on-night)}
.reply .cut{display:none;font-family:var(--display);font-size:var(--t-1);color:var(--danger-on-night);margin-top:12px}
.demo.flagged .reply .cut{display:block}
.scope{position:relative}
.scope svg{width:100%;height:auto}
.scope .trace{fill:none;stroke:var(--on-night);stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}
.scope .thr{stroke:var(--danger-on-night);stroke-width:1.5;stroke-dasharray:6 6}
.scope .axis{stroke:var(--night-rule);stroke-width:1}
.scope text{font-family:var(--display);font-size:13px;fill:var(--on-night-muted)}
.scope .thr-t{fill:var(--danger-on-night)}
.state{font-family:var(--display);font-weight:600;font-size:var(--t0);margin:20px 0 0;min-height:1.5em;color:var(--on-night-muted)}
.demo.flagged .state{color:var(--danger-on-night)}
.demo.passed .state{color:var(--on-night)}
.demo-note{margin-top:20px}

/* statement */
.statement{font-family:var(--display);font-weight:700;font-size:clamp(var(--t4),5.6vw,var(--t6));letter-spacing:-.03em;line-height:1.05;max-width:18ch;margin:0}
.statement span{color:var(--ink-muted);display:block;margin-top:.3em;font-size:.62em;letter-spacing:-.02em;line-height:1.15;max-width:26ch}

/* result chart (real data) */
.result-line{font-size:clamp(var(--t2),3.6vw,var(--t4));max-width:30ch;margin-bottom:64px}
figure{margin:0}
.chart{background:var(--surface);border-radius:8px;padding:clamp(24px,4vw,48px)}
.tile.surface .chart{background:var(--paper)}
.chart-t{font-family:var(--display);font-weight:700;font-size:var(--t1);margin:0 0 4px}
.chart-s{font-size:var(--t-1);color:var(--ink-muted);margin:0 0 32px}
.bars{display:grid;grid-template-columns:minmax(150px,240px) 1fr 72px;gap:18px 24px;align-items:center}
.bars .who b{display:block;font:600 var(--t0)/1.2 var(--display)}
.bars .who span{display:block;line-height:1.35;margin-top:2px;font-size:var(--t-1);color:var(--ink-muted);font-family:var(--display)}
.track{height:28px;background:var(--sunk);position:relative}
.tile.surface .track{background:var(--sunk)}
.fill{height:100%;background:var(--bar-other)}
.ours .fill{background:var(--ink)}
.val{font:700 var(--t1)/1 var(--display);text-align:right}
.na .val{font:400 var(--t-1)/1.3 var(--display);color:var(--ink-muted)}
.bars .group{grid-column:1/-1;font:600 var(--t-1) var(--display);color:var(--ink-muted);margin-top:12px;border-bottom:1px solid var(--rule);padding-bottom:6px}
.bars .group:first-child{margin-top:0}
@media (max-width:640px){.bars{grid-template-columns:1fr 60px}.bars .who{grid-column:1/-1;margin-bottom:-10px}}
.chart-foot{margin-top:28px;font-size:var(--t-1);color:var(--ink-muted);max-width:80ch}

/* two-column comparison, no cards */
.versus{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--rule)}
.versus>div{padding:40px 48px 8px 0}
.versus>div+div{padding-left:48px;border-left:1px solid var(--rule)}
.versus h3{font-size:var(--t3);letter-spacing:-.025em;font-weight:700;margin-bottom:24px}
.versus .old h3{color:var(--ink-muted)}
.versus li{list-style:none;padding:12px 0;border-bottom:1px solid var(--rule);font-size:var(--t0)}
.versus .k{font-family:var(--display);font-size:var(--t-1);color:var(--ink-muted);margin-bottom:8px}
@media (max-width:760px){.versus{grid-template-columns:1fr}.versus>div,.versus>div+div{padding:32px 0 8px;border-left:0}}

/* prose + diagram */
.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px 80px;align-items:center}
.split.rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
@media (max-width:900px){.split,.split.rev{grid-template-columns:1fr}}
.split h2{margin-bottom:28px}
.diagram text{font-family:var(--display);font-size:15px;fill:var(--ink)}
.diagram .m{fill:var(--ink-muted);font-size:13px}
.diagram .ln{stroke:var(--ink);stroke-width:1.5;fill:none}
.diagram .lyr{stroke:var(--ink-muted);stroke-width:1;fill:var(--paper)}
.diagram .tap{stroke:var(--ink);stroke-width:2;fill:none}
.diagram .flag{fill:var(--danger)}
.diagram .flag-t{fill:var(--danger);font-weight:600}
.diagram .box{fill:var(--paper);stroke:var(--ink);stroke-width:1.5}
.diagram .ghost{fill:var(--ink)}
.diagram .ghost-t{fill:var(--paper);font-weight:700}

/* tables & lists */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-family:var(--display);font-size:var(--t0)}
th,td{text-align:left;vertical-align:top;padding:16px 24px 16px 0;border-bottom:1px solid var(--rule)}
th:last-child,td:last-child{padding-right:0}
th{font-weight:600;font-size:var(--t-1);color:var(--ink-muted)}
td.num,th.num{text-align:right;white-space:nowrap}
td.num{font-weight:700;font-size:var(--t1)}
td .sub{display:block;font-size:var(--t-1);color:var(--ink-muted);font-weight:400}
tbody tr:first-child td{border-top:1px solid var(--ink)}
.night th,.night td{border-color:var(--night-rule)}
.rows{border-top:1px solid var(--ink)}
.rows>div{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:8px 48px;padding:28px 0;border-bottom:1px solid var(--rule)}
.rows h3{font-size:var(--t1)}
.rows p{margin:0}
.rows .when{display:block;font:400 var(--t-1) var(--display);color:var(--ink-muted);margin-bottom:6px}
@media (max-width:760px){.rows>div{grid-template-columns:1fr}}
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:40px 80px}
.cols2 h3{margin-bottom:8px}
@media (max-width:760px){.cols2{grid-template-columns:1fr}}
.plain{padding-left:1.1em}
.plain li{margin:0 0 .5em}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:0;border-top:1px solid var(--ink)}
.facts>div{padding:20px 24px 20px 0;border-bottom:1px solid var(--rule)}
.facts dt{font:400 var(--t-1) var(--display);color:var(--ink-muted)}
.facts dd{margin:4px 0 0;font:600 var(--t1)/1.2 var(--display)}
details{margin-top:28px;font-size:var(--t-1)}
summary{font:600 var(--t0) var(--display);cursor:pointer;color:var(--ink)}
details ul{margin-top:12px;padding-left:1.1em;max-width:80ch}
details li{margin-bottom:.6em}
.big-ghost{font-size:clamp(var(--t5),8vw,var(--t7));letter-spacing:-.035em;line-height:1}
.status{font:400 var(--t-1) var(--display);color:var(--ink-muted);display:block;margin-bottom:12px}
.night .status{color:var(--on-night-muted)}
.night .lead{max-width:40ch}

/* contact */
.contact{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px 96px}
@media (max-width:900px){.contact{grid-template-columns:1fr}}
.topics dt{font:700 var(--t0) var(--display);margin-top:24px}
.topics dd{margin:4px 0 0;color:var(--ink-muted)}
form{display:grid;gap:22px;background:var(--surface);padding:clamp(24px,4vw,44px);border-radius:8px}
.r2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media (max-width:560px){.r2{grid-template-columns:1fr}}
label{display:block;font:600 var(--t-1) var(--display);margin-bottom:6px}
label span{font-weight:400;color:var(--ink-muted)}
input,select,textarea{width:100%;font:400 var(--t0)/1.4 var(--display);color:var(--ink);background:var(--field);border:1px solid var(--field-rule);border-radius:4px;padding:12px 14px}
input:hover,select:hover,textarea:hover{border-color:var(--ink-muted)}
input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--action);outline-offset:1px;border-color:var(--action)}
textarea{resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px}
.form-status{font-family:var(--display);font-size:var(--t-1);margin:0;min-height:1.4em}
.form-status.ok{color:var(--ink)}
.form-status.err{color:var(--danger)}
button.btn:disabled{background:var(--ink-muted);cursor:progress}

/* legal */
.legal{max-width:70ch}
.legal h2{font-size:var(--t2);margin:48px 0 12px}
.legal h2:first-child{margin-top:0}
.legal ul{padding-left:1.1em;margin:0 0 1em}
.note{color:var(--ink-muted);font-size:var(--t-1)}

/* footer */
.foot{background:var(--sunk);padding:64px 0 40px;font-family:var(--display);font-size:var(--t-1)}
.foot-grid{display:grid;grid-template-columns:minmax(0,6fr) repeat(2,minmax(0,3fr));gap:32px 48px}
.foot p{max-width:36ch;color:var(--ink-muted)}
.foot h2{font-size:var(--t-1);font-weight:600;color:var(--ink-muted);margin-bottom:12px;letter-spacing:0}
.foot ul{list-style:none}
.foot li{margin-bottom:8px}
.foot a{color:var(--ink);text-decoration:none}
.foot a:hover{text-decoration:underline}
.foot-base{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:56px;padding-top:20px;border-top:1px solid var(--rule);color:var(--ink-muted)}
.foot-base nav{display:flex;gap:24px}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}.foot-grid>div:first-child{grid-column:1/-1}}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}