/* Rutter — Daylight Kinetic (Attio DNA × Clear-sky tokens × Kinetic Chapter Grammar)
   Conviction: "Evidence in daylight." Motion budget lives at the bottom.
   Display weight law: 400–500 only, pinned in @font-face — boldness is scale + tracking. */

@font-face{font-family:Geist;src:url(./fonts/geist.woff2) format("woff2");font-weight:400 500;font-display:swap}
@font-face{font-family:"Geist Mono";src:url(./fonts/geist-mono.woff2) format("woff2");font-weight:400 500;font-display:swap}

:root{
  --sky-hi:#DDEBFF; --sky-lo:#1B4FD8; --navy:#0E2A66; --ground:#F9FAFC;
  --ink:#10203E; --ink-inverse:#F4F8FF; --sun:#FFB627; --relief:#1B8A5A;
  --line:#DCE4F2; --muted:#4A5B7C; --muted-inv:#B9CBEF; --card:#FEFEFD;
  --sans:Geist,ui-sans-serif,-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --pad:clamp(20px,5.5vw,88px);
  --dur-quick:150ms; --dur-enter:900ms; --ease:cubic-bezier(.25,1,.5,1);
  --dots:radial-gradient(rgba(16,32,62,.07) 1px,transparent 1px);
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--ground);color:var(--ink);font:18px/1.6 var(--sans);
  -webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
section{padding:12vh var(--pad)}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--sky-lo)}
.d1{font-size:clamp(46px,7.2vw,108px);font-weight:500;letter-spacing:-.035em;line-height:1.02}
.d2{font-size:clamp(30px,4vw,54px);font-weight:500;letter-spacing:-.03em;line-height:1.08}
.d3{font-size:clamp(21px,2vw,26px);font-weight:500;letter-spacing:-.02em}
.lede{font-size:clamp(18px,1.6vw,21px);color:var(--muted);max-width:56ch}
/* K1 two-tone */
.tail{color:var(--muted)}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:var(--ink);color:var(--ink-inverse);padding:8px 14px;border-radius:8px;z-index:99}

/* nav as object: floating pill cluster */
.nav{position:sticky;top:14px;z-index:50;display:flex;justify-content:space-between;align-items:center;
  margin:14px var(--pad) 0;padding:10px 14px;background:rgba(249,250,252,.82);
  backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:999px;
  box-shadow:0 8px 26px rgba(16,32,62,.06)}
.nav__brand{display:flex;gap:10px;align-items:center;font-weight:500;text-decoration:none}
.nav__links{display:flex;gap:22px;font-size:14px}
.nav__links a{text-decoration:none;color:var(--muted)}
.nav__links a:hover,.nav__links a:focus-visible{color:var(--ink)}
.pill{display:inline-block;padding:11px 22px;border-radius:999px;text-decoration:none;font-weight:500;
  font-size:15px;transition:translate var(--dur-quick) ease-out,box-shadow var(--dur-quick) ease-out}
.pill--sun{background:var(--sun);color:var(--ink)}
.pill--sun:hover,.pill--sun:focus-visible{translate:0 -2px;box-shadow:0 8px 22px rgba(255,182,39,.4)}
.pill--ghost{border:1px solid var(--line);background:var(--card);color:var(--ink)}
.pill--ghost:hover,.pill--ghost:focus-visible{translate:0 -2px;box-shadow:0 8px 20px rgba(16,32,62,.08)}
.pill--lg{padding:14px 28px;font-size:16px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row--center{justify-content:center}

/* ---- K2 · satellite-rise hero ---- */
.hero{min-height:88vh;position:relative;overflow:clip;text-align:center;
  background:linear-gradient(180deg,var(--ground) 55%,var(--sky-hi) 130%)}
.hero__inner{max-width:880px;margin:0 auto;display:grid;gap:20px;justify-items:center}
.hero__media{width:min(880px,92%);margin:44px auto 0;border-radius:18px;overflow:hidden;
  border:1px solid var(--line);box-shadow:0 30px 70px rgba(14,42,102,.16)}
.sat{position:absolute;background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:10px 16px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;
  box-shadow:0 12px 30px rgba(14,42,102,.10)}
.sat b{color:var(--sky-lo);font-weight:500}
.sat--a{left:6vw;bottom:20vh}.sat--b{right:6vw;bottom:26vh}.sat--c{right:12vw;top:18vh}
.hero__chip{color:var(--muted)}
.hero__chip b{color:var(--sky-lo);font-weight:500}

/* banner (anti-superlative) */
.banner{text-align:center;background:var(--sky-hi);background-image:var(--dots);background-size:22px 22px;
  border-block:1px solid var(--line)}
.banner .d2{margin:10px 0}
.banner__sub{max-width:60ch;margin:0 auto;color:var(--muted)}

/* K1 scrub lead-in */
.scrub-line{font-size:clamp(24px,2.6vw,36px);font-weight:500;letter-spacing:-.02em;max-width:34ch}

/* ---- K3 · rail-chapter ---- */
.mech{display:grid;grid-template-columns:230px 1fr;gap:6vw;align-items:start}
.rail{position:sticky;top:16vh;list-style:none;padding:0}
.rail li{border-left:2px solid transparent;transition:border-color var(--dur-quick),color var(--dur-quick)}
.rail a{display:block;padding:9px 0 9px 16px;text-decoration:none;font-size:15px}
.js .rail li{color:var(--muted)}
.js .rail li[data-active]{color:var(--ink);border-left-color:var(--sky-lo)}
.panel{min-height:64vh;padding:7vh 0;border-bottom:1px solid var(--line);display:grid;
  align-content:center;gap:16px}
.panel:last-child{border-bottom:0}
.chip{display:inline-flex;gap:10px;align-items:center;font-family:var(--mono);font-size:12px;
  letter-spacing:.05em;background:var(--card);border:1px solid var(--line);border-radius:999px;
  padding:7px 14px;width:max-content}
.chip span{color:var(--relief)}
.chip b{color:var(--sky-lo);font-weight:500}

/* ---- K4 · theme-shift chapter (navy second act) ---- */
.shift{position:relative;background:var(--navy);color:var(--ink-inverse);min-height:105vh;
  display:grid;align-content:center;justify-items:center;text-align:center;gap:22px;overflow:clip}
.shift::before{content:"";position:absolute;inset:0;background:var(--ground);pointer-events:none;opacity:0}
.ghost{font-size:clamp(34px,5.4vw,84px);font-weight:500;letter-spacing:-.03em;line-height:1.05;
  max-width:18ch;position:relative}
.shift .lede{color:var(--muted-inv)}
.shift__media{width:min(760px,90%);border-radius:16px;overflow:hidden;border:1px solid rgba(221,235,255,.18);
  box-shadow:0 30px 80px rgba(0,0,0,.35)}
.shift__formula{font-family:var(--mono);font-size:13px;letter-spacing:.04em;color:var(--muted-inv)}
.shift__formula b{color:var(--sun);font-weight:500}

/* ---- K6 · flip-digits stat band (real, repo-verifiable counts only) ---- */
.stats{text-align:center;border-bottom:1px solid var(--line)}
.stats__row{display:flex;gap:6vw;justify-content:center;flex-wrap:wrap;margin-top:5vh}
.stat{display:grid;gap:6px;justify-items:center}
.metric{font-size:clamp(44px,5.5vw,84px);font-weight:500;letter-spacing:-.02em;display:inline-flex;
  overflow:hidden;height:1.1em;line-height:1.1;color:var(--sky-lo)}
.digit{display:inline-block}
.digit .col{display:block;translate:0 -11em}
.digit .col span{display:block;height:1.1em}
.stat small{color:var(--muted);font-size:14px}

/* ---- K7 · bento (loop) — every card carries one move ---- */
.bento{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:5vh}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;min-height:210px;
  display:grid;gap:10px;align-content:start;
  transition:translate var(--dur-quick) ease-out,box-shadow var(--dur-quick) ease-out}
.card:hover{translate:0 -4px;box-shadow:0 14px 34px rgba(14,42,102,.10)}
.card--sweep{background:linear-gradient(120deg,var(--sky-hi),var(--card),#FFF3D6);background-size:300% 300%}
.card--rule{background:var(--ink);color:var(--ink-inverse);border-color:var(--ink)}
.card--rule .mono{color:var(--sun)}
.card__img{border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.lane{overflow:hidden;white-space:nowrap;
  mask:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent)}
.lane>div{display:inline-block}
.lchip{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:5px 12px;
  margin-right:8px;font-family:var(--mono);font-size:11px;letter-spacing:.05em;background:var(--ground)}

/* limits (QUIET — no motion, feature-section scale) */
.limits{background:var(--card);border-block:1px solid var(--line)}
.limits__list{max-width:760px;margin-top:4vh;display:grid;gap:26px}
.limits__list dt{font-size:clamp(20px,1.8vw,24px);font-weight:500;letter-spacing:-.015em}
.limits__list dd{margin:6px 0 0;color:var(--muted)}

/* CTA + footer */
.cta{text-align:center;background:linear-gradient(180deg,var(--ground),var(--sky-hi));display:grid;gap:18px;justify-items:center}
.cta__cross{color:var(--muted);font-size:14px}
.foot{padding:8vh var(--pad);display:grid;gap:10px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
.foot .fine{font-size:12.5px;max-width:70ch}

@media (max-width:820px){
  .nav__links{display:none}
  .mech{grid-template-columns:1fr}
  .mech>*{min-width:0;max-width:100%}
  .chip{width:auto;max-width:100%;flex-wrap:wrap;word-break:break-all}
  .rail{position:static;display:flex;gap:4px;overflow-x:auto}
  .rail li{border-left:0;border-bottom:2px solid transparent}
  .js .rail li[data-active]{border-left-color:transparent;border-bottom-color:var(--sky-lo)}
  .rail a{padding:8px 10px;white-space:nowrap}
  .sat{display:none}
  .panel{min-height:0}
}

/* ================= MOTION BUDGET =================
   Declared moves: K2 entrance · K1 scrub ×1 · K3 rail swap · K4 ground shift +
   ghost emerge · K6 flip-digits · K7 sweep + lane + hover · hash-resolve (JS).
   QUIET: .limits and .foot carry no motion. Only transform/opacity animate
   (declared exception: K1 scrub background-position, one instance).
   Hidden-until-revealed styles are scoped under .js — a script failure renders
   the full page (README lesson 2). */

@keyframes rise{from{opacity:0;translate:0 24px}}
@keyframes drift{to{translate:0 -8px}}
@keyframes fadeout{to{opacity:0}}
@keyframes emerge{to{opacity:1}}
@keyframes flip{from{translate:0 0}to{translate:0 -11em}}
@keyframes sweep{to{background-position:100% 100%}}
@keyframes lane{to{translate:-50% 0}}
@keyframes k1fill{to{background-position:0% 0}}

@media (prefers-reduced-motion:no-preference){
  /* K2 — staged entrance, 60–90ms stagger, ≤1200ms total */
  .js.ready .hero__inner>*{animation:rise var(--dur-enter) var(--ease) both}
  .js.ready .hero__inner>:nth-child(2){animation-delay:70ms}
  .js.ready .hero__inner>:nth-child(3){animation-delay:140ms}
  .js.ready .hero__inner>:nth-child(4){animation-delay:210ms}
  .js.ready .hero__media{animation:rise var(--dur-enter) var(--ease) 280ms both}
  .js.ready .sat{animation:rise var(--dur-enter) var(--ease) both,drift 14s ease-in-out 1.8s infinite alternate}
  .js.ready .sat--a{animation-delay:380ms,1.8s}.js.ready .sat--b{animation-delay:450ms,2.2s}.js.ready .sat--c{animation-delay:520ms,2.6s}
  /* K7 ambient */
  .card--sweep{animation:sweep 12s ease-in-out infinite alternate}
  .lane>div{animation:lane 28s linear infinite}
  .lane:hover>div{animation-play-state:paused}

  @supports (animation-timeline: view()){
    /* K1 scrub — one instance */
    .scrub-line{background:linear-gradient(90deg,var(--ink) 50%,var(--muted) 50%);
      background-size:220% 100%;background-position:100% 0;
      -webkit-background-clip:text;background-clip:text;color:transparent;
      animation:k1fill linear both;animation-timeline:view();
      animation-range:entry 20% cover 55%;animation-duration:1ms}
    /* K4 — ground shift scrubbed over the boundary, title emerges from ghost */
    .shift::before{opacity:1;animation:fadeout linear both;animation-timeline:view();
      animation-range:entry 0% entry 65%;animation-duration:1ms}
    .ghost{opacity:.14;animation:emerge linear both;animation-timeline:view();
      animation-range:entry 10% cover 35%;animation-duration:1ms}
    /* K6 — split-flap resolve to the true (repo-verifiable) value */
    .digit .col{animation:flip 1ms steps(10,end) both;animation-timeline:view();
      animation-range:entry 30% entry 90%}
  }
}