/* FFour Apps — stylesheet
   Shares palette and type with the wider FFour family of sites. */

:root{
  --bg:#F3EFE7;
  --surface:#FBF9F4;
  --surface-2:#ECE7DB;
  --ink:#1C1A17;
  --ink-soft:#34302A;
  --muted:#6E675C;
  --sage:#6B7355;
  --sage-deep:#545C40;
  --sage-tint:#E7E8DE;
  --sand:#C5BE9E;
  --line:rgba(28,26,23,.13);
  --display:'Fraunces',Georgia,serif;
  --body:'Hanken Grotesk',system-ui,-apple-system,sans-serif;
  --maxw:1240px;
  --gut:clamp(20px,5vw,40px);
  --r:4px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 1px 2px rgba(28,26,23,.04),0 18px 50px -28px rgba(28,26,23,.28);
  --measure:48ch;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--body);
  font-size:clamp(1rem,.96rem + .2vw,1.0625rem);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration-color:var(--sand);text-underline-offset:.18em;text-decoration-thickness:1px;transition:text-decoration-color .3s var(--ease),color .3s var(--ease)}
a:hover{text-decoration-color:var(--sage-deep)}
:focus-visible{outline:2px solid var(--sage-deep);outline-offset:3px;border-radius:2px}
::selection{background:var(--sage-tint);color:var(--ink)}

.wrap{width:min(100% - 2*var(--gut),var(--maxw));margin-inline:auto}
.skip{position:absolute;left:var(--gut);top:-3rem;padding:.5rem .9rem;background:var(--ink);color:var(--surface);border-radius:var(--r);z-index:20}
.skip:focus{top:.75rem}

/* Type */
h1,h2,h3{font-family:var(--display);font-weight:500;letter-spacing:-.015em;line-height:1.08;margin:0;text-wrap:balance;font-variation-settings:"opsz" 144}
h1{font-size:clamp(2.25rem,1.5rem + 4.2vw,4.75rem);line-height:1.02}
h2{font-size:clamp(1.75rem,1.35rem + 1.9vw,2.75rem)}
h3{font-size:clamp(1.25rem,1.1rem + .6vw,1.5rem);font-variation-settings:"opsz" 36}
p{margin:0}
.lede{font-size:clamp(1.1rem,1rem + .55vw,1.375rem);line-height:1.5;color:var(--ink-soft);max-width:var(--measure)}
.prose{max-width:var(--measure);color:var(--ink-soft)}
.prose>*+*{margin-top:1.1em}
.prose h2{margin-top:2.2em}
.prose h2+p{margin-top:.6em}
.label{
  display:inline-flex;align-items:center;gap:.6em;
  font-size:.75rem;font-weight:600;letter-spacing:.03em;text-transform:uppercase;color:var(--sage-deep)
}
.label::before{content:"";width:1.5rem;height:1px;background:var(--sage);flex:none}
.muted{color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:10;background:rgba(243,239,231,.96);border-bottom:1px solid var(--line)}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;gap:1rem 1.5rem;flex-wrap:wrap;min-height:4.25rem;padding-block:.75rem}
.wordmark{font-family:var(--display);font-size:1.375rem;font-weight:600;letter-spacing:-.015em;text-decoration:none;line-height:1;font-variation-settings:"opsz" 48}
.wordmark em{font-style:normal;color:var(--sage-deep)}
.nav{display:flex;flex-wrap:wrap;gap:.25rem 1.35rem;margin:0;padding:0;list-style:none}
.nav a{font-size:.8125rem;font-weight:600;letter-spacing:.02em;text-transform:uppercase;text-decoration:none;color:var(--ink-soft);padding-block:.25rem}
.nav a:hover{color:var(--ink)}
@media (max-width:480px){
  .site-header .bar{padding-block:.9rem}
  .nav{width:100%;gap:.25rem 1.1rem}
}

/* Sections */
section{padding-block:clamp(4rem,5rem + 4vw,8.5rem)}
section + section{border-top:1px solid var(--line)}
.section-head{display:grid;gap:1rem;margin-bottom:clamp(2.25rem,2rem + 2vw,3.5rem)}
.section-head .label{margin-bottom:.25rem}

/* Hero */
.hero{position:relative;overflow:hidden;padding-block:clamp(4rem,4rem + 4vw,8rem)}
.hero::before{
  content:"";position:absolute;top:-30%;right:-15%;width:70vw;max-width:900px;aspect-ratio:1;border-radius:50%;
  background:radial-gradient(closest-side,rgba(232,222,196,.8),rgba(231,232,222,.4) 55%,rgba(243,239,231,0) 100%);
  pointer-events:none;z-index:0
}
.hero .wrap{position:relative;z-index:1;display:grid;gap:2.5rem;align-items:center}
.hero-copy{display:grid;gap:1.75rem}
.hero h1{max-width:20ch}
.hero .lede{margin-top:.25rem}
.hero-art{margin:0;position:relative;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:var(--surface);max-width:100%}
.hero-art img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.hero-art::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(255,255,255,.16),rgba(255,255,255,0) 40%)}
@media (min-width:900px){
  .hero{padding-block:clamp(4rem,3rem + 5vw,8rem)}
  .hero .wrap{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(2.5rem,4vw,5rem)}
  .hero-art{justify-self:end;width:100%;max-width:520px}
  .hero-art img{aspect-ratio:4/5}
}
.actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:.75rem}
.btn{
  position:relative;overflow:hidden;
  display:inline-flex;align-items:center;gap:.5em;
  padding:.85em 1.5em;border-radius:100px;
  font-size:.9375rem;font-weight:600;letter-spacing:.01em;text-decoration:none;line-height:1;
  border:1px solid var(--ink);background:var(--ink);color:var(--surface);
  transition:background .35s var(--ease),color .35s var(--ease),border-color .35s var(--ease)
}
.btn::after{
  content:"";position:absolute;top:-40%;bottom:-40%;left:-60%;width:45%;
  background:linear-gradient(105deg,rgba(255,255,255,0) 0%,rgba(255,255,255,.35) 50%,rgba(255,255,255,0) 100%);
  transform:skewX(-18deg) translateX(0);pointer-events:none;
  transition:transform .8s var(--ease)
}
.btn:hover::after,.btn:focus-visible::after{transform:skewX(-18deg) translateX(420%)}
.btn:hover{background:var(--sage-deep);border-color:var(--sage-deep);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost::after{background:linear-gradient(105deg,rgba(255,255,255,0) 0%,rgba(255,255,255,.7) 50%,rgba(255,255,255,0) 100%)}
.btn.ghost:hover{background:var(--surface);border-color:var(--ink)}

/* Light band */
.band{position:relative;margin:0;overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface-2)}
.band img{width:100%;height:clamp(240px,36vw,460px);object-fit:cover;display:block}
.band figcaption{
  position:absolute;inset:0;display:grid;align-content:center;gap:.75rem;
  width:min(100% - 2*var(--gut),var(--maxw));margin-inline:auto
}
.band-line{font-family:var(--display);font-weight:500;letter-spacing:-.015em;line-height:1.1;font-size:clamp(1.5rem,1.1rem + 2.4vw,3rem);max-width:16ch;color:var(--ink);font-variation-settings:"opsz" 144}
.band + section{border-top:0}

/* Principles */
.principles{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin:0;padding:0;list-style:none}
.principles li{background:var(--surface);padding:clamp(1.5rem,1.25rem + 1.5vw,2.25rem);display:grid;gap:.85rem;align-content:start}
.principles img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r);border:1px solid var(--line);margin-bottom:.5rem;background:var(--surface-2);transition:transform 1.2s var(--ease)}
.principles li:hover img{transform:scale(1.03)}
@media (min-width:1024px){.principles img{aspect-ratio:1}}
.principles .num{font-family:var(--display);font-style:italic;font-weight:400;color:var(--sage-deep);font-size:.95rem;letter-spacing:0}
.principles p{color:var(--ink-soft);max-width:34ch}
@media (min-width:640px){.principles{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.principles{grid-template-columns:repeat(4,1fr)}}

/* Apps */
.apps-grid{display:grid;gap:1.25rem;margin:0;padding:0;list-style:none}
.apps-grid:empty{display:none}
.app-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:1.75rem;display:grid;gap:.75rem;box-shadow:var(--shadow)}
.app-card .platforms{font-size:.75rem;font-weight:600;letter-spacing:.03em;text-transform:uppercase;color:var(--muted)}
.app-card h3{margin-top:.25rem}
.app-card p{color:var(--ink-soft)}
.app-card .links{display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;margin-top:.5rem;font-weight:600;font-size:.9375rem}
@media (min-width:640px){.apps-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.apps-grid{grid-template-columns:repeat(3,1fr)}}
.apps-empty{
  border:1px dashed var(--sand);border-radius:var(--r);padding:clamp(1.5rem,1.25rem + 1.5vw,2.5rem);
  background:var(--surface);display:grid;gap:.5rem;max-width:56ch
}
.apps-empty p{color:var(--ink-soft)}
.apps-grid:not(:empty) + .apps-empty{display:none}

/* Contact */
.contact .wrap{display:grid;gap:1.5rem}
.email{
  font-family:var(--display);font-weight:500;letter-spacing:-.015em;
  font-size:clamp(1.5rem,1rem + 3.2vw,3.25rem);line-height:1.1;
  text-decoration:none;color:var(--ink);overflow-wrap:anywhere;display:inline-block;justify-self:start
}
.email:hover{color:var(--sage-deep)}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:var(--surface-2);padding-block:clamp(2.5rem,2rem + 2vw,4rem);font-size:.9rem;color:var(--ink-soft)}
.site-footer .wrap{display:grid;gap:2rem}
.site-footer .legal{max-width:62ch;display:grid;gap:.6rem}
.site-footer .legal p{line-height:1.55}
.site-footer .meta{display:flex;flex-wrap:wrap;gap:.75rem 1.5rem;align-items:center;justify-content:space-between;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.8125rem;color:var(--muted)}
.site-footer .meta ul{display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;margin:0;padding:0;list-style:none}
.site-footer a{overflow-wrap:anywhere}
@media (min-width:800px){.site-footer .wrap{grid-template-columns:1fr auto;align-items:start}.site-footer .meta{grid-column:1/-1}}

/* Inner pages */
.page{padding-block:clamp(4rem,4rem + 3vw,7rem)}
.page .wrap{display:grid;gap:2.5rem}
.page h2{font-size:clamp(1.375rem,1.2rem + .8vw,1.75rem);margin-top:.5rem}
.page ul{padding-left:1.2em}
.page li+li{margin-top:.4em}
.back{font-size:.8125rem;font-weight:600;letter-spacing:.02em;text-transform:uppercase;text-decoration:none;color:var(--sage-deep)}

/* Scroll reveal (progressive: content is visible without JS) */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.js .reveal.in{opacity:1;transform:none}
.js .reveal:nth-child(2){transition-delay:.08s}
.js .reveal:nth-child(3){transition-delay:.16s}
.js .reveal:nth-child(4){transition-delay:.24s}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}
  .js .reveal{opacity:1;transform:none;transition:none}
}