/* ==========================================================================
   Rohan Kalyan — Professional Portfolio
   1. Tokens
   2. Reset & base
   3. Typography primitives
   4. Layout primitives
   5. Components
   6. Sections
   7. Responsive
   8. Motion & accessibility
   ========================================================================== */

/* 1. TOKENS ================================================================ */
:root{
  /* ink & text */
  --ink:#0E1216;
  --ink-2:#161C22;
  --ink-3:#1E262E;
  --title:#131A20;
  --text:#454E58;
  --muted:#616A74;

  /* surfaces */
  --paper:#FBFBF8;
  --surface:#FFFFFF;
  --surface-2:#F4F4F0;

  /* lines */
  --line:#E4E4DE;
  --line-2:#D3D3CB;
  --line-dark:rgba(255,255,255,.13);
  --line-dark-2:rgba(255,255,255,.22);

  /* accent */
  --accent:#1B4D5C;
  --accent-hi:#2A6E83;
  --accent-soft:#EEF4F5;
  --accent-light:#8FC3D1;

  /* on dark */
  --on-dark:#F2F3F0;
  --on-dark-2:#C8CFD3;
  --on-dark-muted:#98A2A8;

  /* type */
  --f-display:"Newsreader", "Iowan Old Style", Georgia, serif;
  --f-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --f-mono:"IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* rhythm */
  --shell:1200px;
  --pad-x:clamp(20px, 5vw, 56px);
  --sec-y:clamp(72px, 8.5vw, 128px);
  --r:3px;
}

/* 2. RESET & BASE ========================================================== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:88px}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:var(--f-sans);
  font-size:1.0625rem;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--accent-hi); outline-offset:3px; border-radius:2px}
.section--dark :focus-visible,.hero :focus-visible{outline-color:var(--accent-light)}
::selection{background:var(--accent);color:#fff}

.skip{
  position:fixed; top:8px; left:8px; z-index:200;
  padding:10px 16px; background:var(--ink); color:var(--on-dark);
  font-size:.875rem; border-radius:var(--r);
  transform:translateY(-160%); transition:transform .18s ease;
}
.skip:focus{transform:none}

/* 3. TYPOGRAPHY ============================================================ */
h1,h2,h3{color:var(--title); font-weight:500; line-height:1.12; letter-spacing:-.015em}
h2{font-family:var(--f-display); font-size:clamp(1.95rem,1.25rem + 2.3vw,3.05rem); line-height:1.1; letter-spacing:-.02em}
h3{font-family:var(--f-sans); font-size:1.0625rem; font-weight:600; line-height:1.35; letter-spacing:-.008em}

.eyebrow{
  font-family:var(--f-mono); font-size:.6875rem; font-weight:500;
  letter-spacing:.16em; text-transform:uppercase; color:var(--accent);
  margin:0 0 18px;
}
.eyebrow--light{color:var(--accent-light)}

.deck{font-size:1.0625rem; color:var(--muted); max-width:60ch; margin-top:18px}
.section--dark .deck,.sechead--light .deck{color:var(--on-dark-muted)}

.footnote{
  margin-top:44px; padding-top:20px; border-top:1px solid var(--line);
  font-size:.875rem; color:var(--muted); max-width:72ch;
}

/* 4. LAYOUT ================================================================ */
.shell{max-width:var(--shell); margin-inline:auto; padding-inline:var(--pad-x)}
.section{padding-block:var(--sec-y)}
.section--alt{background:var(--surface-2); border-block:1px solid var(--line)}
.section--dark{background:var(--ink); color:var(--on-dark-2)}
.section--dark h2,.section--dark h3{color:var(--on-dark)}

.sechead{max-width:64ch; margin-bottom:clamp(40px,4.5vw,64px)}
.grid{display:grid; gap:1px}
.grid--4{grid-template-columns:repeat(4,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--2{grid-template-columns:repeat(2,1fr); gap:20px; align-items:start}
.grid--1{grid-template-columns:minmax(0,1fr); gap:20px}

.subhead{
  display:flex; align-items:center; gap:12px; margin-bottom:24px;
  font-family:var(--f-mono); font-size:.6875rem; font-weight:500;
  letter-spacing:.15em; text-transform:uppercase; color:var(--muted);
}
.subhead--spaced{margin-top:clamp(44px,4.5vw,64px)}
.subhead__rule{flex:none; width:22px; height:1px; background:var(--accent)}

/* 5. COMPONENTS ============================================================ */
/* Buttons */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:13px 22px; border-radius:var(--r);
  font-size:.9375rem; font-weight:500; letter-spacing:-.005em;
  border:1px solid transparent; transition:background .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.btn__i{width:15px;height:15px;flex:none}
.btn--solid{background:var(--accent); color:#fff; border-color:var(--accent)}
.btn--solid:hover{background:var(--accent-hi); border-color:var(--accent-hi)}
.btn--ghost{border-color:var(--line-dark-2); color:var(--on-dark)}
.btn--ghost:hover{border-color:var(--on-dark); background:rgba(255,255,255,.06)}
.section .btn--ghost{border-color:var(--line-2); color:var(--title)}
.btn--text{padding:13px 2px; color:var(--on-dark-muted)}
.btn--text:hover{color:var(--accent-light)}
.btn--sm{padding:9px 15px; font-size:.8125rem}

/* Tags & chips */
.tag{
  display:inline-block; font-family:var(--f-mono); font-size:.625rem; font-weight:500;
  letter-spacing:.13em; text-transform:uppercase; padding:4px 8px;
  border:1px solid var(--line-2); border-radius:2px; margin-right:10px; color:var(--muted);
}
.tag--accent{color:var(--accent); border-color:color-mix(in srgb,var(--accent) 32%,transparent); background:var(--accent-soft)}

.chips{display:flex; flex-wrap:wrap; gap:8px; margin-top:20px}
.chips li{
  font-size:.8125rem; color:var(--text); padding:6px 12px;
  border:1px solid var(--line-2); border-radius:2px; background:var(--surface);
}
.chips b{font-family:var(--f-mono); font-weight:500; color:var(--accent); font-variant-numeric:tabular-nums}

.tags{display:flex; flex-wrap:wrap; gap:7px}
.tags li{font-size:.8125rem; color:var(--text); padding:5px 11px; border:1px solid var(--line); border-radius:2px; background:var(--surface)}

/* Ticks list */
.ticks li{position:relative; padding-left:17px; font-size:.9375rem; line-height:1.5; margin-top:11px; color:var(--text)}
.ticks li::before{
  content:""; position:absolute; left:0; top:.62em; width:6px; height:1px; background:var(--accent);
}

/* Cards */
.card{background:var(--surface); border:1px solid var(--line); padding:clamp(22px,2.2vw,30px); transition:border-color .2s ease, background .2s ease}
.card--cap{border-radius:0; margin:-.5px}
.card--cap:hover{border-color:var(--line-2); background:#fff}
.card--cap h3{padding-bottom:16px; border-bottom:1px solid var(--line); margin-bottom:6px; color:var(--title); min-height:calc(2 * 1.35em + 16px)}

/* 6. SECTIONS ============================================================== */

/* --- Progress bar --- */
.progress{position:fixed; inset:0 0 auto 0; height:2px; z-index:120; background:transparent; pointer-events:none}
.progress span{display:block; height:100%; width:0; background:var(--accent-hi); transition:width .08s linear}

/* --- Nav --- */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:110;
  background:rgba(14,18,22,.86); backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid transparent; transition:background .25s ease,border-color .25s ease;
}
.nav.is-stuck{background:rgba(251,251,248,.9); border-bottom-color:var(--line)}
.nav__inner{display:flex; align-items:center; justify-content:space-between; height:66px}
.nav__brand{display:flex; align-items:center; gap:11px; color:var(--on-dark); transition:color .25s ease}
.nav.is-stuck .nav__brand{color:var(--title)}
.nav__mark{width:22px; color:var(--accent-light); transition:color .25s ease}
.nav.is-stuck .nav__mark{color:var(--accent)}
.nav__name{font-size:.9375rem; font-weight:600; letter-spacing:-.01em}
.nav__links{display:flex; align-items:center; gap:26px}
.nav__links a{font-size:.875rem; color:var(--on-dark-muted); transition:color .2s ease; position:relative}
.nav.is-stuck .nav__links a{color:var(--muted)}
.nav__links a:hover,.nav__links a[aria-current="true"]{color:var(--on-dark)}
.nav.is-stuck .nav__links a:hover,.nav.is-stuck .nav__links a[aria-current="true"]{color:var(--accent)}
.nav__links a[aria-current="true"]::after{
  content:""; position:absolute; left:0; right:0; bottom:-7px; height:1px; background:currentColor;
}
.nav__resume,.nav__resume:hover{color:#fff!important}
.nav__resume::after{display:none!important}
.nav__toggle{display:none; width:40px; height:40px; margin-right:-8px; position:relative}
.nav__toggle span{
  position:absolute; left:9px; width:22px; height:1.5px; background:var(--on-dark);
  transition:transform .25s ease, opacity .2s ease, background .25s ease;
}
.nav.is-stuck .nav__toggle span{background:var(--title)}
.nav__toggle span:nth-child(1){top:16px}
.nav__toggle span:nth-child(2){top:23px}
.nav__toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.nav__toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

/* --- Hero --- */
.hero{
  background:var(--ink); color:var(--on-dark-2);
  padding-top:clamp(120px,13vw,168px); padding-bottom:clamp(72px,8vw,110px);
  position:relative; overflow:hidden;
}
.hero::after{
  content:""; position:absolute; inset:auto 0 0 0; height:1px;
  background:linear-gradient(90deg,transparent,var(--line-dark-2) 30%,var(--line-dark-2) 70%,transparent);
}
.hero__grid{display:grid; grid-template-columns:1.12fr .88fr; gap:clamp(40px,6vw,88px); align-items:center}
.hero__title{
  font-family:var(--f-display); font-weight:400;
  font-size:clamp(2.6rem,1.1rem + 5.1vw,4.75rem); line-height:1.02; letter-spacing:-.028em;
  color:var(--on-dark); margin-bottom:26px;
}
.hero__thesis{
  font-family:var(--f-display); font-size:clamp(1.15rem,.95rem + .75vw,1.5rem);
  line-height:1.4; color:var(--accent-light); letter-spacing:-.01em; margin-bottom:18px;
}
.hero__lede{max-width:52ch; color:var(--on-dark-muted); font-size:1rem}
.hero__domains{display:flex; flex-wrap:wrap; gap:0 10px; margin-top:26px; font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.13em; text-transform:uppercase; color:var(--on-dark-muted)}
.hero__domains li:not(:last-child)::after{content:"·"; margin-left:10px; color:var(--line-dark-2)}
.hero__cta{display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin-top:36px}

/* Scope-of-ownership chart */
.scope{border:1px solid var(--line-dark); background:rgba(255,255,255,.025); padding:26px 26px 22px}
.scope__head{display:flex; justify-content:space-between; align-items:baseline; gap:16px; margin-bottom:6px}
.scope__head .eyebrow{margin:0}
.scope__years{font-family:var(--f-mono); font-size:.6875rem; color:var(--on-dark-muted); letter-spacing:.06em}
.scope__chart{position:relative; padding-top:26px}
.scope__note{
  font-family:var(--f-mono); font-size:.6875rem; color:var(--on-dark-muted); letter-spacing:.02em;
}
.scope__note b{color:var(--on-dark); font-weight:500}
.scope__note--start{margin-top:14px}
.scope__note--end{position:absolute; top:0; right:0; text-align:right}
.scope__bars{display:grid; grid-template-columns:repeat(5,1fr); gap:10px; align-items:end; height:186px; border-bottom:1px solid var(--line-dark-2)}
.scope__col{display:flex; flex-direction:column; justify-content:flex-end; height:100%}
.scope__bar{
  height:var(--h); min-height:10px;
  background:var(--bar,var(--accent));
  transform-origin:bottom; animation:grow .9s cubic-bezier(.2,.7,.3,1) both;
}
.scope__col:nth-child(1) .scope__bar{--bar:#1E4150}
.scope__col:nth-child(2) .scope__bar{--bar:#255A6C; animation-delay:.08s}
.scope__col:nth-child(3) .scope__bar{--bar:#2D7387; animation-delay:.16s}
.scope__col:nth-child(4) .scope__bar{--bar:#458EA1; animation-delay:.24s}
.scope__col:nth-child(5) .scope__bar{--bar:#8FC3D1; animation-delay:.32s}
.scope__yr{
  margin-top:9px; font-family:var(--f-mono); font-size:.6875rem; color:var(--on-dark-muted);
  text-align:center; letter-spacing:.04em;
}
.scope__col--now .scope__yr{color:var(--accent-light)}
.scope__legend{
  margin-top:16px; padding-top:14px; border-top:1px solid var(--line-dark);
  font-size:.8125rem; color:var(--on-dark-muted); line-height:1.5;
}
@keyframes grow{from{transform:scaleY(0);opacity:0}to{transform:scaleY(1);opacity:1}}

/* --- Proof --- */
.band--proof{background:var(--surface); border-bottom:1px solid var(--line); padding-block:clamp(44px,4.5vw,60px)}
.proof{display:grid; grid-template-columns:repeat(4,1fr); gap:clamp(24px,3vw,44px)}
.proof__item{display:flex; flex-direction:column; padding-left:20px; border-left:1px solid var(--line)}
.proof__num{
  font-family:var(--f-sans); font-weight:500; font-variant-numeric:tabular-nums;
  font-size:clamp(2.3rem,1.5rem + 2.4vw,3.35rem); line-height:1; letter-spacing:-.035em;
  color:var(--title); margin-bottom:14px;
}
.proof__label{font-size:.9375rem; font-weight:600; color:var(--title); line-height:1.35; margin-bottom:7px}
.proof__sub{font-size:.8125rem; color:var(--muted); line-height:1.5}
.proof__scope{
  margin-top:clamp(28px,3vw,40px); padding-top:18px; border-top:1px solid var(--line);
  font-size:.8125rem; color:var(--muted); max-width:96ch; line-height:1.6;
}

/* --- Progression --- */
.prog{display:grid; grid-template-columns:220px 1fr; gap:clamp(32px,5vw,72px); align-items:start}
.prog__rail{position:sticky; top:112px}
.prog__rail ol{border-left:1px solid var(--line-2)}
.prog__rail a{
  display:flex; align-items:baseline; gap:12px; padding:11px 0 11px 20px;
  font-size:.9375rem; color:var(--muted); position:relative; transition:color .22s ease;
}
.prog__rail a::before{
  content:""; position:absolute; left:-1px; top:11px; bottom:11px; width:2px;
  background:var(--accent); opacity:0; transition:opacity .22s ease;
}
.prog__rail a:hover{color:var(--title)}
.prog__rail a.is-active{color:var(--accent); font-weight:500}
.prog__rail a.is-active::before{opacity:1}
.prog__n{font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.08em; color:var(--muted); transition:color .22s ease}
.prog__rail a.is-active .prog__n{color:var(--accent)}

.prog__panels{display:flex; flex-direction:column; gap:1px; background:var(--line)}
.stage{background:var(--surface); padding:clamp(26px,3vw,40px); scroll-margin-top:100px}
.stage__meta{display:flex; flex-wrap:wrap; align-items:baseline; gap:14px; margin-bottom:14px; font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.13em; text-transform:uppercase; color:var(--muted)}
.stage__word{color:var(--accent); font-weight:500; padding-right:14px; border-right:1px solid var(--line-2)}
.stage h3{font-family:var(--f-display); font-weight:400; font-size:clamp(1.3rem,1.1rem + .7vw,1.7rem); letter-spacing:-.018em; line-height:1.22; margin-bottom:12px}
.stage p{font-size:.9375rem; max-width:66ch}

/* --- Cases --- */
.cases--featured{margin-bottom:20px}
.case{
  background:var(--surface); border:1px solid var(--line);
  display:flex; flex-direction:column; transition:border-color .2s ease, box-shadow .2s ease;
}
.case:hover{border-color:var(--line-2); box-shadow:0 1px 2px rgba(14,18,22,.04)}
.case--lead{border-top:2px solid var(--accent)}
.case.is-open{border-color:color-mix(in srgb,var(--accent) 38%,transparent)}
.case__top{padding:clamp(22px,2.4vw,32px); flex:1}
.case__meta{
  display:flex; flex-wrap:wrap; align-items:center; gap:6px 10px;
  flex-direction:column; align-items:flex-start;
  font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.1em;
  text-transform:uppercase; color:var(--muted); margin-bottom:16px; line-height:1.6;
}
.case__meta .tag{margin-right:0}
.case__title{font-family:var(--f-display); font-weight:400; font-size:clamp(1.25rem,1.05rem + .8vw,1.7rem); letter-spacing:-.02em; line-height:1.2; margin-bottom:12px}
.case--lead .case__title{font-size:clamp(1.4rem,1.1rem + 1.1vw,1.95rem)}
.case__sum{font-size:.9375rem; color:var(--text); max-width:52ch}
.case__stats{display:flex; flex-wrap:wrap; gap:0; margin-top:24px; border-top:1px solid var(--line); padding-top:18px}
.case__stats li{flex:1 1 0; min-width:96px; display:flex; flex-direction:column; padding-right:16px}
.case__stats b{font-size:1.5rem; font-weight:500; letter-spacing:-.03em; color:var(--accent); font-variant-numeric:tabular-nums; line-height:1.1}
.case__stats span{font-size:.75rem; color:var(--muted); margin-top:5px; line-height:1.35}
.case__stats--sm b{font-size:1.2rem}
.case--wide .case__sum{max-width:88ch}
.case--wide .case__stats--five li{min-width:130px}
.detail--wide>div{grid-template-columns:160px 1fr; gap:24px}

.case__toggle{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  width:100%; padding:15px clamp(22px,2.4vw,32px); border-top:1px solid var(--line);
  font-size:.8125rem; font-weight:500; letter-spacing:.02em; color:var(--accent);
  transition:background .18s ease;
}
.case__toggle:hover{background:var(--accent-soft)}
.case__chev{width:9px; height:9px; border-right:1.5px solid currentColor; border-bottom:1.5px solid currentColor; transform:rotate(45deg) translate(-2px,-2px); transition:transform .25s ease}
.case__toggle[aria-expanded="true"] .case__chev{transform:rotate(-135deg) translate(-2px,-2px)}

.case__panel{display:grid; grid-template-rows:0fr; transition:grid-template-rows .35s cubic-bezier(.3,.7,.3,1)}
.case__panel[data-open="true"]{grid-template-rows:1fr}
.case__panel-inner{overflow:hidden}
.case__panel[data-open="true"] .case__panel-inner{overflow:visible}
.detail{padding:6px clamp(22px,2.4vw,32px) 4px; display:grid; gap:0}
.detail>div{display:grid; grid-template-columns:118px 1fr; gap:16px; padding:14px 0; border-top:1px solid var(--line)}
.detail dt{font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.11em; text-transform:uppercase; color:var(--muted); padding-top:3px}
.detail dd{margin:0; font-size:.9375rem; color:var(--text)}

.gov-note{
  margin:14px clamp(22px,2.4vw,32px) clamp(22px,2.4vw,32px);
  padding:16px 18px; background:var(--accent-soft);
  border-left:2px solid var(--accent); font-size:.875rem; color:var(--title); line-height:1.55;
}
.gov-note b{color:var(--accent)}
.gov-note--plain{background:var(--surface-2); border-left-color:var(--line-2)}
.gov-note--plain b{color:var(--title)}

/* --- Lifecycle strip --- */
.lifecycle{display:grid; grid-template-columns:repeat(5,1fr); gap:1px; background:var(--line-2); border:1px solid var(--line-2)}
.lifecycle li{
  display:flex; align-items:baseline; gap:10px;
  background:var(--surface); padding:16px 18px;
  font-size:.875rem; font-weight:500; color:var(--title); line-height:1.35;
}
.lifecycle__n{font-family:var(--f-mono); font-size:.625rem; letter-spacing:.1em; color:var(--accent); flex:none}

/* --- Method pipeline --- */
.pipe{display:grid; grid-template-columns:repeat(6,1fr); gap:0; position:relative}
.pipe::before{
  content:""; position:absolute; left:15px; right:calc(16.6667% - 15px); top:15px; height:1px; background:var(--line-2);
}
.pipe__step{position:relative; padding:0 18px 0 0}
.pipe__n{
  display:inline-flex; align-items:center; justify-content:center;
  width:30px; height:30px; border-radius:50%; background:var(--surface);
  border:1px solid var(--accent); color:var(--accent);
  font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.02em;
  position:relative; z-index:1; margin-bottom:18px;
}
.pipe__step h3{margin-bottom:8px; font-size:.9375rem; min-height:calc(2 * 1.35em)}
.pipe__step p{font-size:.8125rem; color:var(--muted); line-height:1.55}

.boundary{
  margin-top:clamp(44px,5vw,68px); padding:clamp(28px,3vw,40px);
  background:var(--ink); color:var(--on-dark-2); border-left:3px solid var(--accent-light);
}
.boundary .eyebrow{color:var(--accent-light)}
.boundary h3{font-family:var(--f-display); font-weight:400; font-size:clamp(1.4rem,1.1rem + 1.1vw,2rem); letter-spacing:-.02em; color:var(--on-dark); margin-bottom:14px}
.boundary p{max-width:74ch; font-size:1rem; color:var(--on-dark-2)}

/* --- GenAI --- */
.role-guard{
  border:1px solid var(--line-dark); border-left:2px solid var(--accent-light);
  padding:18px 22px; font-size:.9375rem; color:var(--on-dark-2); max-width:80ch;
  margin-bottom:clamp(36px,4vw,56px);
}
.role-guard span{
  display:block; font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.14em;
  text-transform:uppercase; color:var(--accent-light); margin-bottom:8px;
}
.flow{max-width:760px; margin-inline:auto; display:flex; flex-direction:column; align-items:stretch}
.flow__node{border:1px solid var(--line-dark); background:rgba(255,255,255,.03); padding:16px 20px; text-align:center}
.flow__node p{font-size:.9375rem; color:var(--on-dark)}
.flow__k{display:block; font-family:var(--f-mono); font-size:.625rem; letter-spacing:.15em; text-transform:uppercase; color:var(--on-dark-muted); margin-bottom:7px}
.flow__k--me,.flow__k--out{color:var(--accent-light)}
.flow__node--me{border-color:var(--accent-light); background:rgba(143,195,209,.07)}
.flow__node--out{border-color:var(--accent-light); background:rgba(143,195,209,.07)}
.flow__link{height:26px; width:1px; background:var(--line-dark-2); margin-inline:auto; position:relative}
.flow__link::after{
  content:""; position:absolute; bottom:0; left:-3px; width:7px; height:7px;
  border-right:1px solid var(--line-dark-2); border-bottom:1px solid var(--line-dark-2); transform:rotate(45deg);
}
.flow--tail{margin-top:0}
.flow__link--top{margin-top:0}

.fails{
  position:relative; max-width:760px; margin:52px auto 26px;
  border:1px dashed var(--line-dark-2); padding:20px 22px; background:rgba(255,255,255,.02);
}
.fails::before{
  content:""; position:absolute; top:-27px; left:50%; width:1px; height:26px; background:var(--line-dark-2);
}
.fails__head{display:flex; align-items:center; gap:12px; font-family:var(--f-mono); font-size:.625rem; letter-spacing:.15em; text-transform:uppercase; color:var(--on-dark-muted); margin-bottom:16px}
.fails__rule{flex:none; width:22px; height:1px; background:var(--accent-light)}
.fails ul{display:flex; flex-wrap:wrap; gap:8px}
.fails li{font-size:.8125rem; color:var(--on-dark-2); padding:6px 12px; border:1px solid var(--line-dark); border-radius:2px}

.genai__close{
  max-width:68ch; margin:clamp(40px,4.5vw,60px) auto 0; text-align:center;
  font-family:var(--f-display); font-size:clamp(1.1rem,.95rem + .6vw,1.4rem);
  line-height:1.45; letter-spacing:-.012em; color:var(--on-dark);
}

/* --- About --- */
.about{display:grid; grid-template-columns:1.15fr .85fr; gap:clamp(40px,6vw,88px); align-items:start}
@media (min-width:961px){ .about__copy{position:sticky; top:112px} }
.about__copy p{margin-bottom:16px; max-width:60ch}
.about__copy h2{margin-bottom:22px}
.about__copy .btn{margin-top:14px}
.about__creds{display:flex; flex-direction:column; gap:26px}
.cred__k{font-family:var(--f-mono); font-size:.6875rem; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); padding-bottom:12px; margin-bottom:14px; border-bottom:1px solid var(--line)}
.cred__list li{display:flex; flex-direction:column; padding:11px 0; border-bottom:1px solid var(--line)}
.cred__list li:last-child{border-bottom:0}
.cred__list b{font-size:.9375rem; font-weight:600; color:var(--title)}
.cred__list span{font-size:.8125rem; color:var(--muted); margin-top:3px}
.cred__list--prog li{padding:9px 0}
.cred__list--prog b{font-weight:500}
.cred__status{
  align-self:flex-start; margin-top:5px!important;
  font-family:var(--f-mono); font-size:.625rem; letter-spacing:.11em; text-transform:uppercase;
  color:var(--muted); border:1px solid var(--line-2); border-radius:2px; padding:3px 7px;
}

/* --- Contact --- */
.section--contact{padding-block:clamp(64px,7vw,104px)}
.contact{display:grid; grid-template-columns:1fr 1fr; gap:clamp(36px,5vw,72px); align-items:center}
.contact__links{display:flex; flex-direction:column; border-top:1px solid var(--line-dark)}
.clink{
  display:flex; align-items:baseline; justify-content:space-between; gap:20px;
  padding:20px 4px; border-bottom:1px solid var(--line-dark); transition:padding .22s ease, border-color .22s ease;
}
.clink:hover{padding-left:12px; border-bottom-color:var(--accent-light)}
.clink--static{cursor:default}
.clink--static:hover{padding-left:4px; border-bottom-color:var(--line-dark)}
.clink--static .clink__v{color:var(--on-dark-2)}
.clink__k{font-family:var(--f-mono); font-size:.625rem; letter-spacing:.15em; text-transform:uppercase; color:var(--on-dark-muted); flex:none}
.clink__v{display:inline-flex; align-items:center; gap:8px; font-size:1.0625rem; color:var(--on-dark); text-align:right}
.clink--cta .clink__v{color:var(--accent-light)}

/* --- Footer --- */
.foot{background:var(--ink); border-top:1px solid var(--line-dark); padding-block:26px}
.foot__inner{display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px}
.foot__name{font-size:.8125rem; color:var(--on-dark-2)}
.foot__note{font-size:.75rem; color:var(--on-dark-muted)}

/* 7. RESPONSIVE ============================================================ */
@media (max-width:1080px){
  .prog{grid-template-columns:180px 1fr}
  .lifecycle{grid-template-columns:repeat(3,1fr)}
  .pipe{grid-template-columns:repeat(3,1fr); row-gap:34px}
  .pipe::before{display:none}
  .pipe__step{padding-right:24px}
}

@media (max-width:960px){
  .hero__grid{grid-template-columns:1fr; gap:44px}
  .scope{max-width:560px}
  .grid--4,.grid--3{grid-template-columns:repeat(2,1fr)}
  .proof{grid-template-columns:repeat(2,1fr); gap:28px 24px}
  .case--wide .case__stats--five li{min-width:110px}
  .about{grid-template-columns:1fr; gap:48px}
  .contact{grid-template-columns:1fr; gap:36px; align-items:stretch}
}

@media (max-width:900px){
  html{scroll-padding-top:76px}
  .nav__toggle{display:block}
  .nav__links{
    position:fixed; inset:66px 0 auto 0; flex-direction:column; align-items:stretch; gap:0;
    background:var(--ink); border-bottom:1px solid var(--line-dark);
    padding:8px var(--pad-x) 22px; transform:translateY(-8px); opacity:0; visibility:hidden;
    transition:opacity .22s ease, transform .22s ease, visibility .22s;
    max-height:calc(100dvh - 66px); overflow-y:auto;
  }
  .nav__links.is-open{transform:none; opacity:1; visibility:visible}
  .nav__links a{padding:13px 0; font-size:1rem; color:var(--on-dark-2)!important; border-bottom:1px solid var(--line-dark)}
  .nav__links a[aria-current="true"]{color:var(--accent-light)!important}
  .nav__links a::after{display:none!important}
  .nav.is-stuck{background:rgba(251,251,248,.94)}
  .nav.is-stuck .nav__links{background:var(--paper)}
  .nav.is-stuck .nav__links a{color:var(--text)!important; border-bottom-color:var(--line)}
  .nav.is-stuck .nav__links a[aria-current="true"]{color:var(--accent)!important}
  .nav__resume{
    justify-content:center; margin-top:14px; border-bottom:0!important;
    background:var(--accent); border-radius:var(--r); padding:13px 18px!important;
  }
  .nav.is-stuck .nav__resume{color:#fff!important}

  .prog{grid-template-columns:minmax(0,1fr); gap:24px}
  .prog__rail{position:static; min-width:0}
  .prog__panels{min-width:0}
  .prog__rail ol{display:flex; overflow-x:auto; border-left:0; border-bottom:1px solid var(--line-2); gap:4px; scrollbar-width:none}
  .prog__rail ol::-webkit-scrollbar{display:none}
  .prog__rail li{flex:none}
  .prog__rail a{padding:10px 14px 12px; white-space:nowrap; gap:8px}
  .prog__rail a::before{left:0; right:0; top:auto; bottom:-1px; width:auto; height:2px}

  .grid--2{grid-template-columns:1fr}
  .detail>div,.detail--wide>div{grid-template-columns:1fr; gap:5px}
  .detail dt{padding-top:0}
}

@media (max-width:640px){
  .pipe{grid-template-columns:1fr; row-gap:0}
  .pipe__step{padding:0 0 26px 46px; border-left:1px solid var(--line-2); margin-left:15px}
  .pipe__step:last-child{padding-bottom:0; border-left-color:transparent}
  .pipe__n{position:absolute; left:-15px; top:0; margin-bottom:0}
  .pipe__step h3{margin-top:4px; min-height:0}
  .card--cap h3{min-height:0}
  .stage__word{border-right:0; padding-right:0}
  .case__stats{display:grid; grid-template-columns:repeat(2,1fr); gap:18px 16px}
  .case__stats li{padding-right:0}

  .proof{grid-template-columns:1fr; gap:22px}
  .proof__item{padding-left:16px}
  .grid--4,.grid--3{grid-template-columns:1fr}
  .card--cap{margin:0}
  .grid--4 .card--cap:not(:first-child),
  .grid--3 .card--cap:not(:first-child){border-top:0}
  .lifecycle{grid-template-columns:1fr}

  .hero__cta{gap:10px}
  .hero__cta .btn{flex:1 1 100%; justify-content:center}
  .hero__cta .btn--text{flex-basis:auto; justify-content:flex-start}

  .scope__bars{height:150px}
  .scope__note--start{position:static; margin-bottom:12px}
  .scope__chart{padding-top:0}

  .case__stats li{flex:1 1 45%}
  .clink{flex-direction:column; gap:6px; align-items:flex-start}
  .clink__v{text-align:left}
  .foot__inner{flex-direction:column}
}

/* 8. MOTION & A11Y ========================================================= */
.reveal{opacity:0; transform:translateY(14px); transition:opacity .6s ease var(--d,0s), transform .6s cubic-bezier(.2,.7,.3,1) var(--d,0s)}
.reveal.is-visible{opacity:1; transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important; animation-iteration-count:1!important; transition-duration:.001ms!important}
  .reveal{opacity:1; transform:none}
  .scope__bar{animation:none}
  .case__panel{transition:none}
}

@media print{
  .nav,.progress,.case__toggle,.hero__cta,.skip{display:none!important}
  body{background:#fff}
  .hero,.section--dark,.boundary{background:#fff!important; color:#000!important}
  .hero h1,.section--dark h2,.section--dark h3,.boundary h3{color:#000!important}
  .case__panel{grid-template-rows:1fr!important}
}