/* ============================================================
   APOGEE — private spaceflight, edge-of-space experiences
   Style register: "Christopher Nolan" — cinematic wow-factor,
   immersive, scroll-driven. Engineered: transform/opacity only,
   full reduced-motion fallback, tight budget.
   Demo build for the Stack Studios portfolio.
   ============================================================ */

:root {
  --void:   #05070E;
  --void-2: #0A0F1E;
  --panel:  #0E1424;
  --ice:    #EAF1FF;
  --dim:    #8A99B8;
  --faint:  #4E5A76;
  --atmos:  #4DA3FF;   /* atmospheric cyan-blue accent */
  --glow:   #FFB268;   /* warm horizon / ignition — rare */
  --line:   rgba(234,241,255,0.14);
  --line-2: rgba(234,241,255,0.06);
  --sig:      var(--atmos);                                  /* Stack Studios signature — the demo's own accent */
  --sig-line: color-mix(in srgb, var(--sig) 55%, transparent);

  --display: "Big Shoulders Display", "Arial Narrow", system-ui, sans-serif;
  --sans:    "Sora", system-ui, -apple-system, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, "SF Mono", monospace;

  --maxw: 1320px;
  --gutter: clamp(20px, 4vw, 56px);
  --section: clamp(80px, 12vw, 180px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,*::before,*::after { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body {
  margin:0; background:var(--void); color:var(--ice);
  font-family:var(--sans); font-size:16px; line-height:1.6; font-weight:400;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility; overflow-x:hidden;
}
img { display:block; max-width:100%; }
a { color:inherit; text-decoration:none; }
button { font:inherit; cursor:pointer; }
h1,h2,h3,h4 { margin:0; font-family:var(--display); font-weight:700; line-height:0.92; letter-spacing:0.01em; text-transform:uppercase; }
p { margin:0; }
::selection { background:var(--atmos); color:var(--void); }

/* layout */
.wrap { max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gutter); }
.section { padding-block:var(--section); position:relative; }
.section-sm { padding-block: clamp(56px,8vw,110px); }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0; }
.skip-link { position:absolute;left:-999px;top:8px;z-index:200;background:var(--ice);color:var(--void);padding:10px 16px;border-radius:4px; }
.skip-link:focus { left:8px; }

/* mono labels */
.tag { font-family:var(--mono); font-size:0.72rem; letter-spacing:0.18em; text-transform:uppercase; color:var(--atmos); }
.tag-dim { color:var(--dim); }
.data { font-family:var(--mono); font-variant-numeric:tabular-nums; }

/* type scale — Big Shoulders is tall/condensed, so sizes run large */
.d-huge { font-size:clamp(4rem, 15vw, 17rem); line-height:0.86; letter-spacing:0.005em; }
.d-xl { font-size:clamp(3rem, 9vw, 9rem); line-height:0.9; }
.d-l  { font-size:clamp(2.4rem, 5.5vw, 5rem); line-height:0.94; }
.d-m  { font-size:clamp(1.7rem, 3vw, 2.8rem); line-height:0.98; }
.lede { font-family:var(--sans); font-size:clamp(1.05rem,1.5vw,1.3rem); line-height:1.55; color:var(--dim); max-width:48ch; text-transform:none; }
.dim { color:var(--dim); }
.measure { max-width:56ch; }

:focus-visible { outline:2px solid var(--atmos); outline-offset:3px; border-radius:3px; }

/* nav */
.nav { position:fixed; top:0; left:0; right:0; z-index:80; transition:background .4s, border-color .4s; border-bottom:1px solid transparent; }
.nav.solid { background:color-mix(in srgb, var(--void) 78%, transparent); backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px); border-bottom-color:var(--line-2); }
.nav-in { display:flex; align-items:center; justify-content:space-between; height:74px; }
.brand { font-family:var(--display); font-weight:700; font-size:1.6rem; letter-spacing:0.14em; text-transform:uppercase; display:inline-flex; align-items:center; gap:11px; }
.nav-links { display:flex; align-items:center; gap:clamp(18px,2.6vw,38px); list-style:none; margin:0; padding:0; }
.nav-links a { font-family:var(--mono); font-size:0.74rem; letter-spacing:0.1em; text-transform:uppercase; color:var(--ice); opacity:.72; transition:opacity .2s, color .2s; }
.nav-links a:hover, .nav-links a[aria-current="page"] { opacity:1; color:var(--atmos); }
.nav-actions { display:flex; align-items:center; gap:14px; }
.nav-toggle { display:none; background:none; border:0; padding:8px; }
.nav-toggle span { display:block; width:24px; height:1.5px; background:var(--ice); margin:6px 0; }

/* buttons */
.btn { display:inline-flex; align-items:center; gap:11px; font-family:var(--mono); font-size:0.76rem; font-weight:500; letter-spacing:0.1em; text-transform:uppercase; padding:14px 26px; border:1px solid var(--line); color:var(--ice); background:transparent; border-radius:100px; transition:background .25s, color .25s, border-color .25s, transform .1s; }
.btn:hover { background:var(--ice); color:var(--void); border-color:var(--ice); }
.btn-atmos { background:var(--atmos); border-color:var(--atmos); color:var(--void); }
.btn-atmos:hover { background:#8cc4ff; border-color:#8cc4ff; box-shadow:0 0 40px -6px var(--atmos); }
.btn:active, .btn-atmos:active, .nav-toggle:active, .link-u:active { transform:scale(.97); }
.link-u { font-family:var(--mono); font-size:0.76rem; letter-spacing:0.1em; text-transform:uppercase; display:inline-flex; align-items:center; gap:10px; color:var(--atmos); border-bottom:1px solid var(--atmos); padding-bottom:5px; transition:gap .25s; }
.link-u:hover { gap:15px; }

/* ---- HERO with parallax ---- */
.hero { position:relative; height:100svh; min-height:600px; overflow:hidden; display:flex; align-items:flex-end; }
.hero-layer { position:absolute; inset:-10% 0; will-change:transform; }
.hero-img { inset:-14% 0; }
.hero-img img { width:100%; height:100%; object-fit:cover; }
.hero-img::after { content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(5,7,14,.55) 0%, rgba(5,7,14,.05) 30%, rgba(5,7,14,.35) 62%, var(--void) 100%); }
/* CSS starfields (2 layers, tiled dots) */
.stars, .stars-2 { position:absolute; inset:-20% 0; pointer-events:none; will-change:transform; }
.stars { background-image:
  radial-gradient(1.4px 1.4px at 12% 22%, #fff, transparent),
  radial-gradient(1.2px 1.2px at 34% 68%, #cfe2ff, transparent),
  radial-gradient(1px 1px at 58% 14%, #fff, transparent),
  radial-gradient(1.5px 1.5px at 78% 44%, #fff, transparent),
  radial-gradient(1px 1px at 90% 78%, #bcd6ff, transparent),
  radial-gradient(1.2px 1.2px at 45% 88%, #fff, transparent),
  radial-gradient(1px 1px at 22% 52%, #fff, transparent);
  background-size:340px 340px; background-repeat:repeat; opacity:.55; }
.stars-2 { background-image:
  radial-gradient(1px 1px at 8% 40%, #9db8e6, transparent),
  radial-gradient(1px 1px at 62% 30%, #fff, transparent),
  radial-gradient(1px 1px at 84% 62%, #9db8e6, transparent),
  radial-gradient(1px 1px at 40% 76%, #fff, transparent);
  background-size:520px 520px; background-repeat:repeat; opacity:.35; }
.hero-content { position:relative; z-index:3; width:100%; padding-bottom:clamp(44px,6vw,90px); }
.hero-content h1 { margin-top:18px; }
.hero-row { display:flex; align-items:flex-end; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.hero-meta { text-align:right; }
.scrollcue { position:absolute; bottom:22px; left:50%; transform:translateX(-50%); z-index:3; font-family:var(--mono); font-size:0.66rem; letter-spacing:0.2em; text-transform:uppercase; color:var(--dim); }

/* mission data strip */
.strip { border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.strip-in { display:grid; grid-template-columns:repeat(4,1fr); }
.strip-in .cell { padding:26px var(--gutter); border-left:1px solid var(--line); }
.strip-in .cell:first-child { border-left:0; }
.strip .n { font-family:var(--display); font-weight:700; font-size:clamp(2.4rem,4vw,3.6rem); line-height:0.9; }
.strip .n small { font-size:0.32em; color:var(--atmos); }
.strip .k { font-family:var(--mono); font-size:0.68rem; letter-spacing:0.1em; text-transform:uppercase; color:var(--dim); margin-top:10px; }

/* sequence (the ascent) */
.seq { border-top:1px solid var(--line); }
.seq-item { display:grid; grid-template-columns:0.7fr 1.3fr; gap:clamp(20px,4vw,60px); padding:clamp(40px,6vw,72px) 0; border-bottom:1px solid var(--line); align-items:baseline; }
.seq-item .alt { font-family:var(--mono); color:var(--atmos); font-size:0.8rem; letter-spacing:0.1em; }
.seq-item h3 { font-size:clamp(2rem,4vw,3.4rem); margin-top:10px; }
.seq-item p { color:var(--dim); font-size:1.02rem; text-transform:none; max-width:46ch; }

/* split */
.split { display:grid; grid-template-columns:1fr 1fr; gap:clamp(30px,5vw,80px); align-items:center; }
.split.rev .split-media { order:-1; }
.split-media { border:1px solid var(--line); overflow:hidden; border-radius:6px; background:var(--void-2); }
.split-media img { width:100%; height:100%; object-fit:cover; }

/* full-bleed cinematic */
.bleed { position:relative; height:clamp(360px,66vh,760px); overflow:hidden; display:flex; align-items:center; justify-content:center; text-align:center; }
.bleed .bg { position:absolute; inset:-12% 0; will-change:transform; }
.bleed .bg img { width:100%; height:100%; object-fit:cover; }
.bleed .bg::after { content:""; position:absolute; inset:0; background:radial-gradient(120% 100% at 50% 50%, transparent 30%, rgba(5,7,14,.8) 100%); }
.bleed .in { position:relative; z-index:2; padding-inline:var(--gutter); }

/* statement */
.statement { max-width:20ch; margin-inline:auto; }

/* form */
.field { display:grid; gap:8px; margin-bottom:20px; }
.field label { font-family:var(--mono); font-size:0.68rem; letter-spacing:0.12em; text-transform:uppercase; color:var(--dim); }
.field input, .field select, .field textarea { font:inherit; padding:13px 15px; border:1px solid var(--line); background:var(--void-2); color:var(--ice); border-radius:6px; }
.field input:focus, .field select:focus, .field textarea:focus { outline:0; border-color:var(--atmos); }
.field select option { color:#000; }

/* footer */
.footer { border-top:1px solid var(--line); }
.footer-big { font-family:var(--display); font-weight:700; font-size:clamp(4rem,20vw,17rem); line-height:0.82; letter-spacing:0.04em; text-transform:uppercase; padding-block:clamp(30px,5vw,56px); border-bottom:1px solid var(--line); background:linear-gradient(180deg, var(--ice), #6b7c9e); -webkit-background-clip:text; background-clip:text; color:transparent; }
.footer-grid { display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:30px; padding-block:clamp(40px,5vw,64px); }
.footer h4 { font-family:var(--mono); font-size:0.68rem; letter-spacing:0.14em; text-transform:uppercase; color:var(--faint); font-weight:400; margin-bottom:14px; }
.footer nav a { display:block; padding:5px 0; color:var(--dim); font-size:0.9rem; }
.footer nav a:hover { color:var(--atmos); }
.footer-bot { display:flex; justify-content:space-between; align-items:center; padding-block:22px 34px; border-top:1px solid var(--line-2); flex-wrap:wrap; gap:10px; font-family:var(--mono); font-size:0.7rem; letter-spacing:0.06em; text-transform:uppercase; color:var(--faint); }
.demo-flag { border:1px solid var(--line); padding:6px 12px; border-radius:100px; }

/* page hero */
.page-hero { padding-top:clamp(120px,16vw,200px); }
.crumbs { font-family:var(--mono); font-size:0.7rem; letter-spacing:0.1em; text-transform:uppercase; color:var(--faint); margin-bottom:22px; }
.crumbs a:hover { color:var(--atmos); }
.rule { border:0; border-top:1px solid var(--line); margin:0; }

/* ============================================================
   STACK STUDIOS SIGNATURE — recurring craft, in this demo's own
   accent (--sig). Seam hairline · one orchestrated first-load
   moment · footer mark · press feedback. Style-agnostic by design.
   ============================================================ */
.sig-kicker { display:inline-flex; align-items:center; gap:14px; }
.sig-seam   { display:inline-block; width:34px; height:1px; background:var(--sig); transform-origin:left center; flex:none; }
.sig-mask   { display:block; overflow:hidden; padding-block:.12em; margin-block:-.12em; }
.sig-rule   { display:flex; align-items:center; gap:16px; }
.sig-rule::after { content:""; flex:1; height:1px; background:var(--sig-line); }
.sig-credit  { display:inline-flex; align-items:center; gap:9px; }
.sig-emblem  { width:15px; height:15px; color:var(--sig); flex:none; }

@media (prefers-reduced-motion: no-preference){
  /* First-load choreography — pure CSS, plays on load once the inline <head>
     bootstrap adds `.js` (synchronous, before first paint). No dependency on any
     script finishing; with JS off or reduced motion the rules simply don't apply
     and all content is fully visible. Seam draws → headline rises from its mask
     → hero items stagger up. */
  .js .sig-seam      { animation:sig-draw .70s var(--ease) .12s both; }
  .js .sig-mask > h1 { animation:sig-rise .85s var(--ease) .18s both; }
  .js .sig-hero      { animation:sig-up   .60s var(--ease) both; }
  .js .sig-d1 { animation-delay:.08s; }
  .js .sig-d2 { animation-delay:.30s; }
  .js .sig-d3 { animation-delay:.40s; }
  @keyframes sig-draw { from{transform:scaleX(0);}        to{transform:scaleX(1);} }
  @keyframes sig-rise { from{transform:translateY(118%);} to{transform:translateY(0);} }
  @keyframes sig-up   { from{opacity:0;transform:translateY(20px);} to{opacity:1;transform:none;} }
}

/* reveal + motion — all gated behind reduced-motion */
@media (prefers-reduced-motion: no-preference) {
  .js .fade { opacity:0; transform:translateY(28px); transition:opacity .9s var(--ease), transform .9s var(--ease); }
  .js .fade.in { opacity:1; transform:none; }
}
/* reduced-motion: everything static, parallax neutralised via JS not running */

/* responsive */
@media (max-width: 900px) {
  .strip-in, .split, .footer-grid { grid-template-columns:1fr; }
  .strip-in .cell { border-left:0; border-top:1px solid var(--line); }
  .strip-in .cell:first-child { border-top:0; }
  .seq-item { grid-template-columns:1fr; gap:10px; }
  .split.rev .split-media { order:0; }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .nav-links, .nav-actions .btn { display:none; }
  .nav-toggle { display:block; }
  .nav-links.open { display:flex; position:fixed; inset:74px 0 auto 0; flex-direction:column; align-items:flex-start; gap:0; background:var(--void); border-bottom:1px solid var(--line); padding:8px var(--gutter) 22px; z-index:90; }
  .nav-links.open li { width:100%; border-top:1px solid var(--line-2); }
  .nav-links.open a { display:block; padding:16px 0; font-size:0.86rem; }
}
@media (max-width:560px){ .footer-grid{ grid-template-columns:1fr; } }