/* Cohom homepage prototype v1.0 — follows Cohom-Homepage-Spec-v1.0.md.
   Uses brand/LOCKED tokens (cohom-tokens.css, unedited copy). Light-first; dark mode OFF.
   One scoped dark section (#twin) sets data-theme="dark" on the <section> only. */

@font-face{font-family:"Manrope";src:url(../fonts/manrope-var-latin.woff2) format("woff2");font-weight:200 800;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(../fonts/jetbrains-mono-var-latin.woff2) format("woff2");font-weight:100 800;font-display:swap}

/* ---- Web-derived type steps (FLAGGED: derived from the locked scale, pending Guidelines v1.1) ---- */
:root{
  --type-display-2xl: 800 96px/104px var(--font-sans);   /* = 2 x display 48; deck cover 96 */
  --type-display-xl:  800 72px/80px  var(--font-sans);   /* = 1.5 x display */
  --type-headline-lg: 700 56px/64px  var(--font-sans);   /* section H2 >=1280 */
  --type-headline-md: 700 40px/48px  var(--font-sans);   /* section H2 960-1279 */
  --type-lead:        400 20px/30px  var(--font-sans);   /* h3 size, regular weight */
  --margin: 20px; --maxw: 1200px; --sec-pad: 64px; --nav-h: 56px;
}
@media (min-width:600px){:root{--margin:32px;--sec-pad:96px}}
@media (min-width:960px){:root{--margin:48px;--sec-pad:128px}}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg-canvas);color:var(--text-primary);font:var(--type-body-lg);font-feature-settings:"tnum" 0;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{display:block;max-width:100%}
a{color:var(--brand-text)}
.mono{font-family:var(--font-mono);font-feature-settings:"zero" 1,"liga" 0}
.tnum{font-feature-settings:"tnum" 1}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:8px;top:-48px;z-index:100;background:var(--brand-solid);color:var(--text-on-brand);padding:8px 12px;border-radius:8px;font:var(--type-label)}
.skip:focus{top:8px}
:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px;border-radius:4px}

.wrap{max-width:calc(var(--maxw) + 2*var(--margin));margin:0 auto;padding:0 var(--margin)}
.sec{padding:var(--sec-pad) 0;position:relative}
.sec.subtle{background:var(--bg-subtle)}
.overline{font:var(--type-overline);letter-spacing:var(--type-overline-tracking);text-transform:uppercase;color:var(--brand-text);margin:0 0 16px}
.h2{font:var(--type-h1);letter-spacing:-.01em;margin:0 0 24px;max-width:18ch;text-wrap:balance}
@media (min-width:960px){.h2{font:var(--type-headline-md);letter-spacing:-.01em}}
@media (min-width:1280px){.h2{font:var(--type-headline-lg);letter-spacing:-.01em}}
.lead{font:var(--type-body-lg);color:var(--text-secondary);margin:0 0 24px;max-width:60ch}
@media (min-width:600px){.lead{font:var(--type-lead)}}
.body{font:var(--type-body-lg);color:var(--text-secondary);margin:0 0 16px;max-width:62ch}
.caption{font:var(--type-caption);color:var(--text-muted)}
.illus{font:var(--type-caption);color:var(--text-muted);margin-top:16px}
.center{text-align:center}.center .h2,.center .lead{margin-left:auto;margin-right:auto}

/* ---- Buttons (locked: 8px radius, label type; xl 48px is web-derived, FLAGGED) ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 16px;border-radius:var(--radius-md);font:var(--type-label);text-decoration:none;border:1px solid transparent;cursor:pointer;transition:background var(--duration-fast) var(--ease-standard),border-color var(--duration-fast) var(--ease-standard),color var(--duration-fast) var(--ease-standard)}
.btn.xl{height:48px;padding:0 24px;font:600 16px/24px var(--font-sans)}
.btn.sm{height:34px;padding:0 12px}
.btn-primary{background:var(--brand-solid);color:var(--text-on-brand)}
.btn-primary:hover{background:var(--brand-hover)}.btn-primary:active{background:var(--brand-pressed)}
.btn-secondary{background:transparent;color:var(--text-primary);border-color:var(--border-input)}
.btn-secondary:hover{background:var(--bg-subtle)}
.btn-ghost{background:transparent;color:var(--brand-text);padding:0 8px}
.btn-ghost:hover{background:var(--brand-tint)}
.btn[aria-disabled="true"],.btn:disabled{background:var(--surface-sunken);color:var(--text-disabled);border-color:transparent;cursor:not-allowed}
.btn .spin{width:16px;height:16px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* ---- Nav ---- */
.nav{position:sticky;top:0;z-index:50;height:var(--nav-h);background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid transparent;transition:border-color var(--duration-base) var(--ease-standard)}
.nav.scrolled{border-bottom-color:var(--border-default)}
.nav .wrap{display:flex;align-items:center;height:100%;gap:24px}
.wordmark{font:800 22px/1 var(--font-sans);letter-spacing:-.02em;color:var(--brand-solid);text-decoration:none}
.nav ul{display:none;list-style:none;margin:0 0 0 auto;padding:0;gap:4px}
.nav ul a{display:block;padding:8px 12px;border-radius:8px;font:var(--type-label);color:var(--text-secondary);text-decoration:none}
.nav ul a:hover{color:var(--text-primary);background:var(--bg-subtle)}
.nav ul a[aria-current="true"]{color:var(--brand-text);background:var(--brand-tint)}
.nav .btn{margin-left:auto}
.nav .menu-btn{margin-left:8px;width:40px;height:40px;border-radius:8px;border:1px solid var(--border-input);background:transparent;display:inline-flex;align-items:center;justify-content:center}
@media (min-width:960px){.nav ul{display:flex}.nav .btn{margin-left:8px}.nav .menu-btn{display:none}}
.mnav{display:none;position:fixed;inset:var(--nav-h) 0 0 0;background:var(--bg-canvas);z-index:49;padding:24px var(--margin)}
.mnav.open{display:block}
.mnav a{display:block;font:var(--type-h3);color:var(--text-primary);text-decoration:none;padding:12px 0;border-bottom:1px solid var(--border-default)}

/* ---- Reveal on enter (slow 320ms, once) ---- */
.rv{opacity:0;transform:translateY(24px);transition:opacity var(--duration-slow) var(--ease-standard),transform var(--duration-slow) var(--ease-standard)}
.rv.in{opacity:1;transform:none}
.no-js .rv,.static .rv{opacity:1;transform:none}

/* ---- Hero ---- */
.hero{padding:64px 0 0;text-align:center;overflow:hidden}
@media (min-width:960px){.hero{padding-top:96px}}
.hero h1{font:var(--type-display);letter-spacing:-.02em;margin:0 auto 24px;max-width:12ch;color:var(--text-primary)}
@media (min-width:600px){.hero h1{font:var(--type-display-xl);letter-spacing:-.02em}}
@media (min-width:1280px){.hero h1{font:var(--type-display-2xl);letter-spacing:-.02em}}
.hero h1 .hl{color:var(--brand-text)}
.hero .lead{margin:0 auto 32px;max-width:34ch;color:var(--text-secondary)}
.hero .cta-row{justify-content:center}
.hero .micro{font:var(--type-caption);color:var(--text-muted);margin:16px 0 0}
.hero-visual{margin:64px auto 0;max-width:1200px;position:relative}
.hero-visual .stagebg{background:linear-gradient(var(--bg-subtle),var(--bg-subtle));border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding:24px 24px 0}
@media (min-width:960px){.hero-visual .stagebg{padding:48px 48px 0}}

/* ---- Drishya product frame (illustrative) ---- */
.frame{background:var(--surface-card);border:1px solid var(--border-default);border-radius:var(--radius-lg) var(--radius-lg) 0 0;box-shadow:var(--shadow-3);overflow:hidden;text-align:left}
.fbar{display:flex;align-items:center;gap:12px;height:48px;padding:0 16px;border-bottom:1px solid var(--border-default)}
.lockup{display:flex;align-items:center;gap:8px}
.lockup b{font:800 16px/1 var(--font-sans);letter-spacing:-.02em;color:var(--brand-solid)}
.lockup i{width:1px;height:16px;background:var(--border-strong)}
.lockup span{font:600 13px/1 var(--font-sans);color:var(--text-secondary)}
.pill{display:inline-flex;align-items:center;gap:6px;height:22px;padding:0 10px;border-radius:999px;font:var(--type-caption);font-weight:600;border:1px solid var(--border-input);color:var(--text-secondary);background:var(--surface-card);white-space:nowrap}
.pill.ill{border-style:dashed;font-family:var(--font-mono);font-weight:400;letter-spacing:.02em;text-transform:uppercase;font-size:11px}
.fbody{display:grid;grid-template-columns:1fr;min-height:0}
@media (min-width:960px){.fbody{grid-template-columns:1fr 340px}}
.fmain{padding:16px;display:grid;gap:12px;align-content:start}
.vhead{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.vhead h4{font:var(--type-h3);font-size:16px;line-height:24px;margin:0}
.seg{display:inline-flex;border:1px solid var(--border-input);border-radius:8px;overflow:hidden;font:var(--type-caption);font-weight:600}
.seg span{padding:3px 10px;color:var(--text-secondary)}.seg span.on{background:var(--brand-tint);color:var(--brand-text)}
.tiles{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media (min-width:960px){.tiles{grid-template-columns:repeat(4,1fr)}}
.tile{border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:12px 14px;background:var(--surface-card);box-shadow:var(--shadow-1);position:relative;transition:border-color var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast)}
.tile:hover{border-color:var(--border-strong)}
.tile.sel{outline:2px solid var(--focus-ring);outline-offset:2px}
.tile .ov{font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted)}
.tile .val{font:600 20px/28px var(--font-mono);font-feature-settings:"tnum" 1,"zero" 1;margin:4px 0 0;color:var(--text-primary)}
.tile .dl{font:var(--type-mono-sm);color:var(--text-secondary)}
.tile svg.spark{width:100%;height:30px;margin:6px 0}
.tile .ask{font:var(--type-label);color:var(--brand-text);background:none;border:0;padding:4px 0;cursor:pointer;border-radius:4px}
.tile .ask:hover{text-decoration:underline}
.row2{display:grid;grid-template-columns:1fr;gap:12px}
@media (min-width:960px){.row2{grid-template-columns:2fr 1fr}}
.panel{border:1px solid var(--border-default);border-radius:var(--radius-lg);background:var(--surface-card);padding:12px 14px}
.panel .ph{display:flex;justify-content:space-between;align-items:center;font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px}
.gcanvas{background:var(--graph-canvas);border-radius:8px;background-image:radial-gradient(rgba(22,48,44,.06) 1px,transparent 1px);background-size:16px 16px}
.watch{border-left:3px solid var(--info);padding:4px 0 4px 10px;margin:0 0 10px}
.watch b{display:block;font:600 13px/18px var(--font-sans)}
.watch span{font:var(--type-mono-sm);color:var(--text-muted)}
.watch.fired{border-left-color:var(--change-marker)}
.fchat{border-left:1px solid var(--border-default);padding:16px;display:flex;flex-direction:column;gap:10px;background:var(--surface-card)}
.fchat .ch{display:flex;justify-content:space-between;font:600 13px/18px var(--font-sans)}
.kbd{font:var(--type-mono-sm);border:1px solid var(--border-default);border-radius:4px;padding:0 4px;color:var(--text-muted)}
.ctx{align-self:flex-start;background:var(--brand-tint);color:var(--brand-text);font:var(--type-caption);font-weight:600;border-radius:999px;padding:3px 10px}
.q{align-self:flex-end;max-width:85%;background:var(--surface-sunken);border-radius:14px 14px 4px 14px;padding:8px 12px;font:var(--type-body);color:var(--text-primary)}
.ans{border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:12px;background:var(--surface-card);box-shadow:var(--shadow-1)}
.ans .ov{font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px}
.ans p{font:var(--type-body);margin:8px 0 0;color:var(--text-primary)}
.ans .acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.ans.watchc{border-left:3px solid var(--info)}
.ans.cant{border:1px dashed var(--border-input);box-shadow:none}
.cm{font-family:var(--font-mono);color:var(--change-marker);font-size:12px;white-space:nowrap}
.composer{margin-top:auto;display:flex;gap:8px;align-items:center;border:1px solid var(--border-input);border-radius:8px;padding:4px 4px 4px 12px;font:var(--type-body);color:var(--text-muted);background:var(--surface-card)}
.composer input{flex:1;border:0;outline:0;font:var(--type-body);color:var(--text-primary);background:transparent;min-width:0}
.fstrip{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:6px 16px;border-top:1px solid var(--border-default);font:var(--type-mono-sm);color:var(--text-muted);background:var(--bg-subtle)}

/* ---- Evidence chips (locked §4.5; glyphs are inline SVG, not font) ---- */
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;align-items:center;gap:6px;height:22px;padding:0 10px;border-radius:999px;font:600 12px/16px var(--font-sans);border-width:1.2px;white-space:nowrap}
.chip svg{width:10px;height:10px;flex:none}
.ev-rc{background:var(--ev-replay-confirmed-bg);color:var(--ev-replay-confirmed-fg);border:1.2px solid var(--ev-replay-confirmed-border)}
.ev-ne{background:var(--ev-natural-experiment-bg);color:var(--ev-natural-experiment-fg);border:1.2px dashed var(--ev-natural-experiment-border)}
.ev-ob{background:var(--ev-observational-bg);color:var(--ev-observational-fg);border:1.5px dotted var(--ev-observational-border)}
.ev-as{background:var(--ev-assumed-bg);color:var(--ev-assumed-fg);border:3px double var(--ev-assumed-border)}
.ev-ct{background:var(--ev-cant-tell-bg);color:var(--ev-cant-tell-fg);border:1.2px solid var(--ev-cant-tell-border)}
.ev-fc{background:var(--ev-forecast-bg);color:var(--ev-forecast-fg);border:1.2px solid var(--ev-forecast-border)}
.chip.lg{height:28px;padding:0 12px;font-size:13px;line-height:18px}

/* ---- Generic cards ---- */
.grid3{display:grid;gap:24px;grid-template-columns:1fr}
@media (min-width:960px){.grid3{grid-template-columns:repeat(3,1fr)}}
.grid4{display:grid;gap:24px;grid-template-columns:1fr}
@media (min-width:600px){.grid4{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1280px){.grid4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--surface-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-1)}
.card h3{font:var(--type-h3);margin:0 0 8px}
.card p{font:var(--type-body-lg);color:var(--text-secondary);margin:0}
.num{font:600 13px/20px var(--font-mono);color:var(--brand-text);display:block;margin-bottom:12px}
.ic{width:24px;height:24px;stroke:var(--brand-text);fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;margin-bottom:16px}

/* ---- Shift ---- */
.shift-vis{margin-top:48px}
.orgsvg .n{fill:var(--surface-card);stroke:var(--border-strong);stroke-width:1.2}
.orgsvg .n.agent{stroke:var(--graph-node-border)}
.orgsvg text{font:600 12px var(--font-sans);fill:var(--text-primary)}
.orgsvg .k{font:400 10px var(--font-mono);fill:var(--text-muted);letter-spacing:.04em}
.orgsvg .e{stroke:var(--graph-edge);stroke-width:1.25;fill:none}
.orgsvg g.on{opacity:0;transition:opacity var(--duration-slow) var(--ease-standard)}
.shift-vis.in .orgsvg g.on{opacity:1}

/* ---- Blind spot ---- */
.bs-chart{margin:48px 0}
.bs-chart .why{font:800 48px/1 var(--font-sans);letter-spacing:-.02em;fill:var(--text-muted)}

/* ---- Signature: #twin (scoped dark section) ---- */
#twin{background:var(--bg-canvas);color:var(--text-primary);padding:0}
#twin .tall{height:420vh;position:relative}
#twin .stage{position:sticky;top:0;height:100vh;height:100svh;display:grid;align-items:center;overflow:hidden}
#twin .sg{display:grid;grid-template-columns:1fr;gap:24px;align-items:center;width:100%;padding-top:var(--nav-h)}
@media (min-width:960px){#twin .sg{grid-template-columns:minmax(300px,4fr) 8fr;gap:48px}}
#twin .caps{position:relative;min-height:200px}
@media (min-width:960px){#twin .caps{min-height:320px}}
#twin .cap{position:absolute;inset:0;opacity:0;transform:translateY(12px);transition:opacity var(--duration-base) var(--ease-standard),transform var(--duration-base) var(--ease-standard);pointer-events:none}
#twin .cap .overline{color:var(--brand-text)}
#twin .cap h2{font:var(--type-h1);letter-spacing:-.01em;margin:0 0 16px;color:var(--text-primary);text-wrap:balance}
@media (min-width:1280px){#twin .cap h2{font:var(--type-headline-md);letter-spacing:-.01em}}
#twin .cap p{font:var(--type-body-lg);color:var(--text-secondary);margin:0;max-width:40ch}
#twin .cap h2 .hl{color:var(--brand-text)}
#twin[data-step="0"] .cap[data-s="0"],#twin[data-step="1"] .cap[data-s="1"],#twin[data-step="2"] .cap[data-s="2"],#twin[data-step="3"] .cap[data-s="3"],#twin[data-step="4"] .cap[data-s="4"]{opacity:1;transform:none;pointer-events:auto}
#twin .vis{position:relative;height:min(62vh,560px)}
#twin .gwrap{position:absolute;inset:0;transition:transform var(--duration-slow) var(--ease-standard);transform-origin:left center}
#twin .gwrap .gcanvas{position:absolute;inset:0;border:1px solid var(--border-default);border-radius:var(--radius-lg);background-color:var(--graph-canvas);background-image:radial-gradient(rgba(238,243,241,.06) 1px,transparent 1px)}
#twin svg.g{position:absolute;inset:16px;width:calc(100% - 32px);height:calc(100% - 32px)}
.g .node rect{fill:var(--graph-node);stroke:var(--graph-node-border);stroke-width:1.2;transition:stroke var(--duration-base),stroke-width var(--duration-base),fill var(--duration-base)}
.g .node .k{font:400 9.5px var(--font-mono);letter-spacing:.06em;fill:var(--text-muted)}
.g .node .nm{font:600 13px var(--font-sans);fill:var(--text-primary)}
.g .edge{fill:none;stroke:var(--graph-edge);stroke-width:1.25}
.g .node,.g .edge,.g .lbl{opacity:0;transition:opacity var(--duration-slow) var(--ease-standard),transform var(--duration-slow) var(--ease-standard)}
.g .node{transform:scale(.96);transform-box:fill-box;transform-origin:center}
#twin[data-step="1"] .g .node,#twin[data-step="2"] .g .node,#twin[data-step="3"] .g .node,#twin[data-step="4"] .g .node{opacity:1;transform:none}
#twin[data-step="1"] .g .edge.dep,#twin[data-step="2"] .g .edge.dep,#twin[data-step="3"] .g .edge.dep,#twin[data-step="4"] .g .edge.dep{opacity:1}
/* step 2: change marker + outcome moved */
.g .chg,.g .delta{opacity:0;transition:opacity var(--duration-base) var(--ease-standard)}
#twin[data-step="2"] .g .chg,#twin[data-step="3"] .g .chg,#twin[data-step="4"] .g .chg,#twin[data-step="2"] .g .delta,#twin[data-step="3"] .g .delta,#twin[data-step="4"] .g .delta{opacity:1}
#twin[data-step="2"] .g .node.out rect,#twin[data-step="3"] .g .node.out rect,#twin[data-step="4"] .g .node.out rect{stroke:var(--outcome-border);stroke-width:2}
.g .chg text{font:400 11px var(--font-mono);fill:var(--change-marker)}
.g .chg path{fill:var(--change-marker)}
.g .delta rect{fill:var(--graph-node);stroke:var(--outcome-border);stroke-width:1}
.g .delta text{font:600 11px var(--font-mono);fill:var(--text-primary)}
/* step 3: dim + cause path travels once (reveal 600ms) */
#twin[data-step="3"] .g .dim,#twin[data-step="4"] .g .dim{opacity:.4}
#twin[data-step="3"] .g .edge.dep.dim,#twin[data-step="4"] .g .edge.dep.dim{opacity:.25}
.g .cause{fill:none;stroke:var(--cause-edge);stroke-width:3;opacity:1}
.g .cause.path{stroke-dasharray:var(--len);stroke-dashoffset:var(--len)}
#twin.travel .g .cause.path{transition:stroke-dashoffset var(--duration-reveal) var(--ease-reveal)}
#twin.travel .g .cause.p2{transition-delay:0ms}
#twin[data-step="3"] .g .cause.path,#twin[data-step="4"] .g .cause.path{stroke-dashoffset:0}
.g .arrowhead{fill:var(--cause-edge);opacity:0;transition:opacity var(--duration-fast) var(--ease-standard)}
#twin[data-step="3"] .g .arrowhead,#twin[data-step="4"] .g .arrowhead{opacity:1;transition-delay:calc(var(--duration-reveal) * .9)}
#twin[data-step="3"] .g .node.cz rect,#twin[data-step="4"] .g .node.cz rect{stroke:var(--cause-edge);stroke-width:2.5;fill:var(--cause-node-fill)}
.g .obs{fill:none;stroke:var(--graph-edge-evidence);stroke-width:2;stroke-dasharray:1.5 5;stroke-linecap:round;opacity:0;transition:opacity var(--duration-base) var(--ease-standard)}
#twin[data-step="3"] .g .obs,#twin[data-step="4"] .g .obs{opacity:1}
.g foreignObject{overflow:visible}
.g .lbl{transition-delay:0ms}
#twin[data-step="3"] .g .lbl,#twin[data-step="4"] .g .lbl{opacity:1;transition-delay:calc(var(--duration-reveal) + 40ms)}
/* step 4: graph yields, chat enters */
@media (min-width:960px){#twin[data-step="4"] .gwrap{transform:scale(.56)}}
#twin .chatp{position:absolute;right:0;top:0;bottom:0;width:min(330px,100%);display:flex;flex-direction:column;gap:10px;justify-content:center;opacity:0;transform:translateX(24px);transition:opacity var(--duration-slow) var(--ease-standard),transform var(--duration-slow) var(--ease-standard);pointer-events:none}
#twin[data-step="4"] .chatp{opacity:1;transform:none;pointer-events:auto}
#twin .chatp .ctx,#twin .chatp .q,#twin .chatp .ans,#twin .chatp .sent{opacity:0;transition:opacity var(--duration-base) var(--ease-standard)}
#twin[data-step="4"] .chatp .ctx{opacity:1;transition-delay:120ms}
#twin[data-step="4"] .chatp .q{opacity:1;transition-delay:240ms}
#twin[data-step="4"] .chatp .ans.a1{opacity:1;transition-delay:480ms}
#twin[data-step="4"] .chatp .sent.s1{opacity:1;transition-delay:560ms}
#twin[data-step="4"] .chatp .sent.s2{opacity:1;transition-delay:800ms}
#twin[data-step="4"] .chatp .sent.s3{opacity:1;transition-delay:1040ms}
#twin[data-step="4"] .chatp .ans.a2{opacity:1;transition-delay:1440ms}
#twin[data-step="4"] .chatp .sent.s4{opacity:1;transition-delay:1520ms}
#twin .steps{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);display:flex;gap:4px;background:var(--surface-card);border:1px solid var(--border-default);border-radius:999px;padding:4px}
#twin .steps button{font:var(--type-caption);font-weight:600;color:var(--text-muted);background:transparent;border:0;border-radius:999px;padding:6px 12px;cursor:pointer;min-height:28px}
#twin .steps button[aria-current="step"]{background:var(--brand-tint);color:var(--brand-text)}
#twin .illus{position:absolute;right:var(--margin);bottom:28px;margin:0}
@media (max-width:959px){
  #twin .tall{height:380vh}
  #twin .sg{align-content:start;padding-top:calc(var(--nav-h) + 16px)}
  #twin .vis{height:44svh}
  #twin .caps{min-height:210px}
  #twin .chatp{left:0;right:0;width:auto;top:0;bottom:0;justify-content:flex-start}
  #twin .gwrap{transition:transform var(--duration-slow) var(--ease-standard),opacity var(--duration-base) var(--ease-standard)}
  #twin[data-step="4"] .gwrap{opacity:0;transform:scale(.96)}
  #twin .illus{left:var(--margin);right:auto;bottom:72px}
}
/* static / reduced motion / no-js: no pin, final state, all captions listed */
#twin.static .tall{height:auto}
#twin.static .stage{position:relative;height:auto;padding:var(--sec-pad) 0}
#twin.static .caps{min-height:0}
#twin.static .cap{position:static;opacity:1;transform:none;margin-bottom:24px}
#twin.static .cap[data-s="0"] h2{font:var(--type-h1)}
#twin.static .cap:not([data-s="0"]) h2{font:var(--type-h3);margin-bottom:4px}
#twin.static .steps{display:none}
#twin.static .vis{height:auto;display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:960px){#twin.static .vis{grid-template-columns:1.25fr 1fr}#twin.static .sg{grid-template-columns:4fr 8fr}}
#twin.static .gwrap{position:relative;transform:none!important;height:420px}
#twin.static .chatp{position:relative;opacity:1;transform:none;width:auto;inset:auto;background:transparent}
#twin.static .chatp *{opacity:1!important;transition:none!important}
#twin.static .illus{position:static;margin:16px auto 0;max-width:calc(var(--maxw) + 2*var(--margin));padding:0 var(--margin)}

/* ---- Qualia ---- */
.ev-table{margin-top:64px;border-top:1px solid var(--border-default)}
.ev-row{display:grid;grid-template-columns:1fr;gap:8px;padding:20px 0;border-bottom:1px solid var(--border-default);align-items:center}
@media (min-width:600px){.ev-row{grid-template-columns:240px 1fr}}
.ev-row p{margin:0;color:var(--text-secondary)}
.ev-row .chip{justify-self:start}
.ev-div{display:flex;align-items:center;gap:12px;font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted);padding:24px 0 4px}
.ev-div::after{content:"";flex:1;height:1px;background:var(--border-default)}

/* ---- Drishya ---- */
.surf .mini{height:180px;border-radius:8px;background:var(--bg-subtle);border:1px solid var(--border-default);margin-bottom:20px;padding:14px;display:flex;flex-direction:column;gap:8px;overflow:hidden}
.handoff{margin-top:64px;display:grid;grid-template-columns:1fr;gap:24px;align-items:start}
@media (min-width:960px){.handoff{grid-template-columns:5fr 7fr}}
.hdemo{display:grid;grid-template-columns:1fr;gap:16px;background:var(--bg-subtle);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:20px}
@media (min-width:600px){.hdemo{grid-template-columns:240px 1fr}}
.hchat{background:var(--surface-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:14px;display:flex;flex-direction:column;gap:10px;min-height:300px}
.hchat .empty{font:var(--type-body);color:var(--text-muted);margin:auto 0}
.hchat .ans p.sent{opacity:0;transition:opacity var(--duration-base) var(--ease-standard)}
.hchat .ans p.sent.on{opacity:1}

/* ---- How ---- */
.how{counter-reset:s;display:grid;gap:32px;grid-template-columns:1fr;margin-top:48px}
@media (min-width:960px){.how{grid-template-columns:repeat(4,1fr);gap:24px}}
.how li{list-style:none;border-top:2px solid var(--brand-solid);padding-top:20px}
.how h3{font:var(--type-h2);margin:0 0 8px}
.how p{margin:0;color:var(--text-secondary)}

/* ---- Why / What if / What next ---- */
.qs{display:grid;gap:48px;grid-template-columns:1fr;margin-top:48px}
@media (min-width:960px){.qs{grid-template-columns:repeat(3,1fr);gap:32px}}
.qs .big{font:var(--type-display);letter-spacing:-.02em;color:var(--brand-solid);margin:0 0 16px}
@media (min-width:1280px){.qs .big{font:var(--type-display-xl);letter-spacing:-.02em}}
.qs p{color:var(--text-secondary);margin:0 0 16px}
.qs .ex{display:inline-block;background:var(--surface-sunken);border-radius:14px 14px 4px 14px;padding:8px 12px;font:var(--type-body);color:var(--text-primary)}

/* ---- Beachhead ---- */
.two{display:grid;grid-template-columns:1fr;gap:48px;align-items:center}
@media (min-width:960px){.two{grid-template-columns:1fr 1fr;gap:64px}}
.pts{display:grid;gap:20px;margin:32px 0}
.pts div b{display:block;font:var(--type-h3);margin-bottom:4px}
.pts div span{color:var(--text-secondary)}
.pull{font:var(--type-h2);color:var(--brand-solid);margin:32px 0 0}
@media (min-width:960px){.pull{font:var(--type-h1)}}
.flow .n rect{fill:var(--graph-node);stroke:var(--graph-node-border);stroke-width:1.2}
.flow .n .k{font:400 9.5px var(--font-mono);letter-spacing:.06em;fill:var(--text-muted)}
.flow .n .nm{font:600 13px var(--font-sans);fill:var(--text-primary)}
.flow .e{stroke:var(--graph-edge);stroke-width:1.25;fill:none}

/* ---- Commitments ---- */
.tag{display:inline-block;font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted);border:1px dashed var(--border-input);border-radius:4px;padding:2px 8px;margin-top:16px}

/* ---- Ladder ---- */
.ladder{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;align-items:end;margin-top:48px}
@media (min-width:960px){.ladder{grid-template-columns:repeat(4,1fr);gap:24px}}
.rung{border-radius:var(--radius-lg);padding:20px;display:flex;flex-direction:column;justify-content:flex-end;transform-origin:bottom;transition:transform var(--duration-slow) var(--ease-standard),opacity var(--duration-slow) var(--ease-standard)}
.rung .num{margin-bottom:8px}
.rung h3{font:var(--type-h3);margin:0 0 6px}
.rung p{font:var(--type-body);margin:0}
.rung .st{font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;margin-top:12px}
.r1{background:var(--teal-100);color:var(--ink);height:220px}.r1 .num,.r1 .st{color:var(--teal-800)}
.r2{background:var(--teal-300);color:var(--ink);height:280px}.r2 .num,.r2 .st{color:var(--ink)}
.r3{background:var(--teal-700);color:#fff;height:340px}.r3 .num,.r3 .st{color:var(--sage-300)}
.r4{background:var(--teal-900);color:#fff;height:400px}.r4 .num,.r4 .st{color:var(--sage-300)}
@media (max-width:959px){.r1,.r2,.r3,.r4{height:auto;min-height:200px}}
.ladder.rv .rung{transform:scaleY(.6);opacity:0}
.ladder.rv.in .rung{transform:none;opacity:1}
.ladder.rv.in .r2{transition-delay:80ms}.ladder.rv.in .r3{transition-delay:160ms}.ladder.rv.in .r4{transition-delay:240ms}

/* ---- Team ---- */
.team .av{width:96px;height:96px;border-radius:999px;background:var(--brand-tint);color:var(--brand-text);display:flex;align-items:center;justify-content:center;font:800 28px/1 var(--font-sans);letter-spacing:-.02em;margin-bottom:20px;border:1px solid var(--border-default)}
.team .role{font:var(--type-label);color:var(--brand-text);margin:0 0 12px}
.team .ph{font:var(--type-caption);color:var(--text-muted);margin-top:16px}

/* ---- Partner form ---- */
.form{background:var(--surface-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-2)}
@media (min-width:960px){.form{padding:32px}}
.fld{margin-bottom:16px}
.fld label{display:block;font:600 12px/16px var(--font-sans);margin-bottom:6px;color:var(--text-primary)}
.fld .opt{font-weight:500;color:var(--text-muted)}
.fld input,.fld select,.fld textarea{width:100%;height:40px;border:1px solid var(--border-input);border-radius:8px;padding:0 12px;font:var(--type-body);color:var(--text-primary);background:var(--surface-card);transition:border-color var(--duration-fast)}
.fld textarea{height:96px;padding:10px 12px;resize:vertical}
.fld input:hover,.fld select:hover,.fld textarea:hover{border-color:var(--text-secondary)}
.fld input:focus-visible,.fld select:focus-visible,.fld textarea:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}
.fld .help{font:var(--type-caption);color:var(--text-muted);margin-top:6px}
.fld .err{display:none;font:var(--type-caption);color:var(--danger);margin-top:6px}
.fld.invalid input,.fld.invalid select,.fld.invalid textarea{border:2px solid var(--danger)}
.fld.invalid .err{display:block}
.chk{display:flex;gap:10px;align-items:flex-start;font:var(--type-body);color:var(--text-secondary)}
.chk input{width:20px;height:20px;margin:0;accent-color:var(--brand-solid);flex:none}
.hp{position:absolute;left:-9999px}
.success{display:none;padding:24px;border-left:3px solid var(--success);background:var(--success-tint);border-radius:8px}
.success b{color:var(--success)}
.gets{display:grid;gap:12px;margin:24px 0;padding:0;list-style:none}
.gets li{display:flex;gap:12px;color:var(--text-secondary)}
.gets li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-text);margin-top:9px;flex:none}

/* ---- Closing band + footer ---- */
.band{background:var(--teal-900);color:#fff;padding:var(--sec-pad) 0;text-align:center}
.band h2{font:var(--type-h1);letter-spacing:-.01em;margin:0 auto 32px;max-width:20ch;text-wrap:balance}
@media (min-width:960px){.band h2{font:var(--type-headline-lg);letter-spacing:-.01em}}
.band h2 span{color:var(--sage-300)}
.band .cta-row{justify-content:center}
.btn-ondark{background:var(--sage-300);color:var(--teal-950)}
.btn-ondark:hover{background:var(--sage-200)}
.btn-ondark-2{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn-ondark-2:hover{background:rgba(255,255,255,.08)}
.band :focus-visible{outline-color:var(--teal-300)}
.band .dots{display:flex;gap:8px;justify-content:center;margin-bottom:24px}.band .dots i{width:6px;height:6px;border-radius:50%;background:var(--sage-400)}
footer{padding:64px 0 32px;border-top:1px solid var(--border-default)}
.fgrid{display:grid;gap:32px;grid-template-columns:1fr 1fr}
@media (min-width:960px){.fgrid{grid-template-columns:2fr 1fr 1fr 1fr}}
footer h4{font:var(--type-overline);letter-spacing:.055em;text-transform:uppercase;color:var(--text-muted);margin:0 0 12px}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
footer a{font:var(--type-body);color:var(--text-secondary);text-decoration:none}
footer a:hover{color:var(--text-primary);text-decoration:underline}
.legal{margin-top:48px;padding-top:24px;border-top:1px solid var(--border-default);display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;font:var(--type-caption);color:var(--text-muted)}
.tbd{font:var(--type-mono-sm);color:var(--text-muted);border:1px dashed var(--border-input);border-radius:4px;padding:0 4px}

#twin[data-step="3"] .g .under,#twin[data-step="4"] .g .under{opacity:0}
#twin.frozen .tall{height:100vh}
/* final-state graph (hero frame, static) */
.g.final .node,.g.final .edge.dep,.g.final .chg,.g.final .delta,.g.final .lbl,.g.final .obs,.g.final .arrowhead{opacity:1;transform:none}
.g.final .dim{opacity:.4}.g.final .edge.dep.dim{opacity:.25}.g.final .under{opacity:0}
.g.final .cause.path{stroke-dashoffset:0}
.g.final .node.cz rect{stroke:var(--cause-edge);stroke-width:2.5;fill:var(--cause-node-fill)}
.g.final .node.out rect{stroke:var(--outcome-border);stroke-width:2}

/* Nav over the dark section */
.nav.ondark{background:rgba(15,22,20,.72);border-bottom-color:#2C3633}
.nav.ondark .wordmark{color:#EEF3F1}
.nav.ondark ul a{color:#C3CDC9}.nav.ondark ul a:hover{color:#EEF3F1;background:#1B2321}
.nav.ondark ul a[aria-current="true"]{color:#C0DAB4;background:#16302C}
.nav.ondark .btn-primary{background:#C0DAB4;color:#072C2A}.nav.ondark .btn-primary:hover{background:#DCEBD5}
.nav.ondark .menu-btn{color:#EEF3F1;border-color:#74847E}
.nav.ondark :focus-visible{outline-color:#80C1B4}

/* Graph layout switch: desktop vs mobile signature graph */
#twin svg.g-m{display:none}
@media (max-width:599px){#twin svg.g-d{display:none}#twin svg.g-m{display:block}}
/* Small screens: keep diagram text >= 12px via horizontal scroll */
.swipe{display:none}
@media (max-width:599px){
  .hscroll{overflow-x:auto;-webkit-overflow-scrolling:touch;scroll-snap-type:x proximity;margin:0 calc(-1*var(--margin));padding:0 var(--margin)}
  .hscroll .orgsvg{min-width:720px}.hscroll .flow{min-width:560px}.hscroll > svg[viewBox="0 0 1000 260"]{min-width:760px}
  .swipe{display:block}
  .nav .btn{display:none}
  .nav .menu-btn{margin-left:auto}
}
/* Simplified hero visual below 960px */
@media (max-width:959px){
  .frame .row2{display:none}
  .frame .tiles .tile:nth-child(n+3){display:none}
  .frame .fchat .watchc,.frame .fbar .pill:not(.ill){display:none}
  .frame .vhead .caption{display:none}
}
@media (max-width:599px){#twin:not(.static) .chatp .sent.s3{display:none}#twin .chatp{gap:8px}}
.two>*,.grid4>*,.grid3>*{min-width:0}
@media (max-width:599px){#twin .illus{top:calc(var(--nav-h) + 12px);bottom:auto}}
#twin.static .gwrap{opacity:1!important}