/* =========================================================
   Solane Eyewear: scroll-driven hero
   Built from Design_system.md
   ========================================================= */

:root {
  /* Base */
  --c-bg-outer:    #140405;
  --c-bg-deep:     #2A0608;
  --c-crimson-900: #4A0A0E;
  --c-crimson-700: #7A1016;
  --c-crimson-500: #A81C1F;
  --c-ember-400:   #E0512A;
  --c-ember-300:   #F27A45;

  /* Neutrals */
  --c-white:    #F6F1EE;
  --c-white-70: rgba(246, 241, 238, 0.70);
  --c-white-45: rgba(246, 241, 238, 0.45);
  --c-white-20: rgba(246, 241, 238, 0.20);
  --c-white-10: rgba(246, 241, 238, 0.10);
  --c-ink:      #1A0A0B;

  /* Surfaces */
  --c-card-solid: #F4EFEC;
  --c-card-glass: rgba(120, 18, 24, 0.35);
  --c-stroke:     rgba(246, 241, 238, 0.28);

  /* Overlays (tuned for the amber-to-black footage) */
  --g-vignette: radial-gradient(120% 90% at 50% 40%,
                  transparent 40%, rgba(20, 4, 5, 0.45) 78%, rgba(20, 4, 5, 0.85) 100%);
  --g-scrim-left:   linear-gradient(90deg, rgba(42, 6, 8, 0.78) 0%, rgba(42, 6, 8, 0.35) 18%, transparent 34%);
  --g-scrim-right:  linear-gradient(270deg, rgba(42, 6, 8, 0.72) 0%, rgba(42, 6, 8, 0.3) 20%, transparent 38%);
  --g-scrim-bottom: linear-gradient(0deg, rgba(42, 6, 8, 0.55) 0%, transparent 30%);

  /* Spacing */
  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px;
  --frame-inset: 0px;  /* full-bleed: hero fills the viewport */
  --frame-pad:   clamp(20px, 2.4vw, 40px);

  /* Radius & elevation */
  --r-frame: 0px;
  --r-card:  18px;
  --r-pill:  999px;
  --shadow-card: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  --blur-glass:  blur(18px) saturate(140%);

  /* Motion */
  --ease: cubic-bezier(.2, .7, .1, 1);

  /* Type */
  --f-display: 'Inter Tight', 'Inter', system-ui, sans-serif;
  --f-body:    'Inter', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { background: var(--c-bg-outer); }
body {
  background: var(--c-bg-outer);
  color: var(--c-white);
  font-family: var(--f-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--c-ember-300); outline-offset: 3px; border-radius: 4px; }

/* ---------- Preloader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  background: var(--c-bg-outer);
  transition: opacity .8s var(--ease), visibility .8s;
}
.loader.is-done { opacity: 0; visibility: hidden; }
.loader__inner { display: grid; gap: 14px; width: min(280px, 70vw); text-align: center; }
.loader__label { font: 500 12px/1 var(--f-body); letter-spacing: .14em; text-transform: uppercase; color: var(--c-white-70); }
.loader__bar { height: 2px; background: var(--c-white-10); border-radius: 2px; overflow: hidden; }
.loader__bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--c-crimson-500), var(--c-ember-300)); transition: width .2s linear; }
.loader__pct { font: 500 32px/1 var(--f-display); letter-spacing: -0.04em; }

/* ---------- Scroll track & sticky stage ---------- */
.scrolly { position: relative; height: 600vh; /* overwritten by JS from frame count */ }
.stage {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  padding: var(--frame-inset);
}

/* ---------- Frame ---------- */
.hero__frame {
  position: relative;
  height: 100%;
  min-height: 560px;
  border-radius: var(--r-frame);
  overflow: hidden;
  isolation: isolate;
  background: radial-gradient(60% 70% at 55% 45%, #B32A1E 0%, #6E0E14 45%, var(--c-bg-deep) 100%);

  display: grid;
  /* left rail | center void | right rail */
  grid-template-columns: minmax(0, 23fr) minmax(0, 49fr) minmax(0, 28fr);
  grid-template-rows: auto 1fr;
  column-gap: var(--space-5);
  padding: var(--frame-pad);
}

.hero__canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: -3;
  display: block;
  transform: translate3d(var(--px, 0px), var(--py, 0px), 0) scale(1.03);
  transition: transform .6s var(--ease);
}
.hero__overlay {
  position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background: var(--g-scrim-left), var(--g-scrim-right), var(--g-scrim-bottom), var(--g-vignette);
}
.hero__grain {
  position: absolute; inset: -50%; z-index: -1; pointer-events: none; opacity: .07;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
}

/* ---------- Entrance reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--d, 0ms);
}
body.is-ready .reveal { opacity: 1; transform: none; }

/* ---------- Nav ---------- */
.hero__nav {
  grid-column: 1 / -1; grid-row: 1;
  display: flex; align-items: center; gap: var(--space-5);
}
.logo { display: inline-flex; color: var(--c-white); }
.menu { display: grid; gap: 6px; padding: 8px 4px; }
.menu span { display: block; width: 24px; height: 2px; background: var(--c-white); border-radius: 2px; transition: transform .3s var(--ease); }
.menu:hover span:last-child { transform: translateX(6px); }

.links { margin-left: auto; display: flex; gap: var(--space-7); }
.links a {
  font: 500 12px/1 var(--f-body); letter-spacing: .04em;
  color: var(--c-white-70); transition: color .25s;
}
.links a:hover, .links a[aria-current="page"] { color: var(--c-white); }

.social { display: flex; gap: 10px; margin-left: var(--space-6); }
.social a {
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--c-white-10);
  backdrop-filter: var(--blur-glass);
  transition: background .25s;
}
.social a:hover { background: var(--c-white-20); }

/* ---------- Left rail ---------- */
.hero__left {
  grid-column: 1; grid-row: 2;
  display: flex; flex-direction: column; justify-content: space-between;
  padding-top: clamp(40px, 16vh, 200px);
  min-width: 0;
}
.manifesto {
  font: 500 clamp(24px, 2.2vw, 36px)/1 var(--f-display);
  letter-spacing: -0.03em;
}
.caption {
  display: block;
  font: 400 11px/1.35 var(--f-body);
  color: var(--c-white-45);
}
.manifesto-wrap .caption { margin-top: var(--space-3); max-width: 180px; }

.cards { display: flex; gap: var(--space-4); width: max-content; }
.card {
  width: clamp(150px, 13vw, 210px);
  aspect-ratio: 1;
  border-radius: var(--r-card);
  padding: clamp(14px, 1.3vw, 20px);
  display: flex; flex-direction: column; justify-content: space-between;
}
.card__top { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); }
.card--solid { background: var(--c-card-solid); color: var(--c-ink); box-shadow: var(--shadow-card); }
.card--solid .card__top { justify-content: flex-start; }
.card--solid .caption { color: rgba(26, 10, 11, 0.6); }
.icon-pixel { fill: var(--c-ink); flex: none; }
.stat {
  display: block;
  font: 500 clamp(44px, 4.4vw, 72px)/1 var(--f-display);
  letter-spacing: -0.05em;
  margin-bottom: 6px;
}
.card--glass {
  background: var(--c-card-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--c-stroke);
}
.card-title { font: 500 clamp(16px, 1.4vw, 20px)/1.1 var(--f-display); letter-spacing: -0.02em; }
.icon-aperture { flex: none; animation: spin 12s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Center void ---------- */
.hero__void { grid-column: 2; grid-row: 2; pointer-events: none; }

/* ---------- Right rail ---------- */
.hero__right {
  grid-column: 3; grid-row: 2;
  display: flex; flex-direction: column; align-items: flex-end;
  text-align: right;
  padding-top: clamp(24px, 9vh, 120px);
  min-width: 0;
}

/* Chapters stack in the same cell and swap as the film progresses */
.chapters { display: grid; justify-items: end; width: 100%; }
.chapter {
  grid-area: 1 / 1; justify-self: end; width: max-content;
  margin-left: -50vw; /* lets a long headline grow leftward instead of past the edge */
  display: flex; flex-direction: column; align-items: flex-end; pointer-events: none;
}
.chapter.is-active { pointer-events: auto; }

.display {
  font: 500 clamp(40px, 5vw, 104px)/0.92 var(--f-display);
  letter-spacing: -0.045em;
  text-transform: uppercase;
}
.display span { display: block; overflow: hidden; padding-bottom: 0.04em; white-space: nowrap; }
.display i {
  display: inline-block; font-style: normal;
  transform: translateY(105%);
  transition: transform .9s var(--ease);
}
.display span:nth-child(2) i { transition-delay: .08s; }
.display span:nth-child(3) i { transition-delay: .16s; }
body.is-ready .chapter.is-active .display i { transform: translateY(0); }
/* leaving lines slide up and out */
.chapter.is-leaving .display i { transform: translateY(-105%); transition-delay: 0s; transition-duration: .6s; }

.pitch__copy {
  margin-top: clamp(24px, 5vh, 56px);
  max-width: 300px;
  font: 400 14px/1.45 var(--f-body);
  letter-spacing: -0.01em;
  color: var(--c-white-70);
  opacity: 0; transform: translateY(12px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.pitch__copy b { font-weight: 600; color: var(--c-white); }
body.is-ready .chapter.is-active .pitch__copy { opacity: 1; transform: none; transition-delay: .35s; }

.cta {
  margin-top: var(--space-5);
  width: 64px; height: 64px; flex: none;
  border-radius: 50%;
  border: 1.5px solid var(--c-white);
  display: grid; place-items: center;
  transition: background .3s var(--ease), color .3s var(--ease), opacity .7s var(--ease), transform .7s var(--ease);
}
.cta svg { transition: transform .3s var(--ease); }
.cta:hover { background: var(--c-white); color: var(--c-ink); }
.cta:hover svg { transform: translate(3px, -3px); }

.tags {
  margin-top: auto;
  display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-2);
  max-width: 380px;
}
.tag-break { flex-basis: 100%; height: 0; }
.tag {
  height: 32px; padding: 0 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-stroke);
  background: var(--c-white-10);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  display: inline-flex; align-items: center;
  font: 500 12px/1 var(--f-body); letter-spacing: .04em;
  white-space: nowrap;
}
.tag--icon { padding: 0; width: 44px; justify-content: center; }

/* ---------- Scroll hint ---------- */
.scroll-hint {
  position: absolute; left: 50%; bottom: var(--frame-pad);
  transform: translateX(-50%);
  display: grid; justify-items: center; gap: 10px;
  font: 500 10px/1 var(--f-body); letter-spacing: .24em;
  color: var(--c-white-70);
  transition: opacity .5s var(--ease);
}
.scroll-hint i {
  width: 1px; height: 36px;
  background: linear-gradient(var(--c-white), transparent);
  animation: drip 1.8s var(--ease) infinite;
  transform-origin: top;
}
.scroll-hint.is-hidden { opacity: 0; }
@keyframes drip { 0% { transform: scaleY(0); } 60% { transform: scaleY(1); } 100% { transform: scaleY(1); opacity: 0; } }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1279px) {
  .hero__frame { grid-template-columns: minmax(0, 24fr) minmax(0, 46fr) minmax(0, 30fr); }
}

@media (max-width: 1023px) {
  .links { display: none; }
  .social { margin-left: auto; }
  .manifesto-wrap .caption { display: none; }
  .tag-break { display: none; }
  .tag:last-child { display: none; }
  .cards { flex-direction: column; }
  .card { width: 150px; }
  .card--glass { display: none; }
}

/* Phone: stack. Headline on top, film band in the middle, copy + CTA at the bottom */
@media (max-width: 767px) {
  .hero__frame {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr auto;
    min-height: 0;
  }
  .hero__left { display: none; }
  .hero__void { grid-column: 1; grid-row: 3; }
  .hero__right {
    display: contents;
  }
  .chapters { grid-column: 1; grid-row: 2; justify-items: start; padding-top: var(--space-5); }
  .chapter { justify-self: start; margin-left: 0; align-items: flex-start; text-align: left; }
  .display { font-size: clamp(40px, 13vw, 64px); }
  /* copy moves to the bottom of the frame */
  .pitch__copy {
    position: absolute; left: var(--frame-pad); right: calc(var(--frame-pad) + 76px);
    bottom: calc(var(--frame-pad) + 44px);
    margin: 0; max-width: none; text-align: left;
  }
  .cta {
    position: absolute; right: var(--frame-pad); bottom: calc(var(--frame-pad) + 44px);
    width: 56px; height: 56px; margin: 0;
  }
  .tags {
    position: absolute; left: var(--frame-pad); right: var(--frame-pad); bottom: var(--frame-pad);
    justify-content: flex-start; max-width: none; flex-wrap: nowrap; overflow: hidden;
  }
  .tag { height: 28px; padding: 0 12px; font-size: 10px; }
  .tag--icon { width: 34px; padding: 0; }
  .scroll-hint { display: none; }
  .hero__overlay {
    background:
      linear-gradient(180deg, rgba(42, 6, 8, 0.7) 0%, transparent 38%),
      linear-gradient(0deg, rgba(42, 6, 8, 0.85) 0%, rgba(42, 6, 8, 0.4) 26%, transparent 45%);
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .reveal, .display i, .pitch__copy { transition: opacity .4s linear !important; transform: none !important; }
  .icon-aperture, .scroll-hint i { animation: none; }
  .hero__canvas { transition: none; transform: none; }
}