/* ===========================================================================
   Shared scrollytelling story template — /io/ stories.

   One visual system for every rebuilt story. A story page sets its palette in
   an inline :root block and fills in the sections; it never redefines layout.

   Palette hooks (set per story):
     --bg        page background
     --accent    primary accent (kicker, dial needle, numbers, ribbon)
     --accent-2  secondary accent (hero glow, ribbon underline)

   Sections available: .st-hero, .chapter, .split, .figure, .ribbon, .pull,
   .timeline, .outro. Use what the story needs — all are optional.
   =========================================================================== */

:root {
  --bg:       #05070d;
  --accent:   #e8b84b;
  --accent-2: #5c7cfa;

  --fg:    #f2f4f8;
  --muted: #8b93a7;
  --rule:  rgba(255,255,255,.12);
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --pad: clamp(1.25rem, 5vw, 4rem);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--font-body); font-size: clamp(1rem, .95rem + .3vw, 1.15rem);
  line-height: 1.65; overflow-x: hidden;
}
::selection { background: var(--accent); color: #000; }

/* ---------- progress bar ---------- */
.st-progress { position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 100; background: rgba(255,255,255,.07); }
.st-progress i {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width .1s linear;
}

/* ---------- shared type ---------- */
.kicker {
  font-family: var(--font-display); font-size: .72rem; font-weight: 500;
  letter-spacing: .22em; text-transform: uppercase; color: var(--accent);
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.05; }
h1 { font-size: clamp(3rem, 13vw, 9.5rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.9rem, 5vw, 3.5rem); letter-spacing: -.02em; }
h3 { font-size: clamp(1.35rem, 2.6vw, 2rem); letter-spacing: -.01em; }
.lead  { font-size: clamp(1.15rem, 1rem + .8vw, 1.6rem); line-height: 1.5; }
.muted { color: var(--muted); }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px);
  transition: opacity .9s cubic-bezier(.2,.7,.3,1), transform .9s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .12s; }
.reveal.d2 { transition-delay: .24s; }
.reveal.d3 { transition-delay: .36s; }

/* ---------- hero ---------- */
.st-hero {
  position: relative; min-height: 100svh; display: grid; align-items: end;
  padding: var(--pad); overflow: hidden; isolation: isolate;
}
.st-hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -3; }
.st-hero__glow {
  position: absolute; inset: -20%; z-index: -2; pointer-events: none;
  background: radial-gradient(40rem 40rem at var(--mx,60%) var(--my,25%),
              color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 65%);
}

/* the orb — a soft disc tinted by the palette. .orb--moon adds lunar detail. */
.orb {
  position: absolute; z-index: -1; border-radius: 50%;
  width: clamp(14rem, 42vw, 34rem); aspect-ratio: 1;
  right: -6vw; top: 8vh;
  background: radial-gradient(circle at 34% 30%,
    color-mix(in srgb, var(--accent) 55%, #fff) 0%,
    color-mix(in srgb, var(--accent) 75%, #000) 55%,
    color-mix(in srgb, var(--bg) 70%, #000) 100%);
  box-shadow: 0 0 8rem color-mix(in srgb, var(--accent) 24%, transparent),
              inset -2rem -1rem 5rem rgba(0,0,0,.55);
  transform: translate3d(0, var(--orbY, 0px), 0) scale(var(--orbS, 1));
  will-change: transform;
}
.orb--moon {
  background: radial-gradient(circle at 34% 30%, #fdfaf2 0%, #e6e0cf 38%, #b7ae98 66%, #6d6857 88%, #2b2a25 100%);
}
.orb--moon::before, .orb--moon::after {
  content: ''; position: absolute; border-radius: 50%;
  background: rgba(80,74,60,.30); box-shadow: inset .2rem .2rem .6rem rgba(0,0,0,.35);
}
.orb--moon::before { width: 22%; aspect-ratio: 1; left: 22%; top: 44%; }
.orb--moon::after  { width: 12%; aspect-ratio: 1; left: 56%; top: 22%; }

.st-hero__inner { position: relative; max-width: 62rem; }
.st-hero h1 { margin: .6rem 0 1rem; }
.st-hero .sub { font-size: clamp(1.05rem, 1rem + .5vw, 1.45rem); max-width: 34ch; color: #cdd3e0; }
.st-hero .dates {
  margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--rule);
  font-family: var(--font-display); letter-spacing: .12em; font-size: .85rem; color: var(--muted);
}
.st-cue {
  position: absolute; left: 50%; bottom: 1.5rem; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .5rem;
  font-size: .7rem; letter-spacing: .2em; text-transform: uppercase; color: var(--muted);
  transition: opacity .4s;
}
.st-cue span {
  display: block; width: 1px; height: 2.5rem;
  background: linear-gradient(var(--muted), transparent); animation: cue 2.2s infinite;
}
@keyframes cue { 0%,100% { transform: scaleY(.3); transform-origin: top; opacity:.4 } 50% { transform: scaleY(1); opacity:1 } }

/* ---------- generic chapter ---------- */
.chapter { padding: clamp(6rem, 18vh, 12rem) var(--pad); }
.chapter .wrap { max-width: 46rem; margin: 0 auto; }
.chapter p + p { margin-top: 1.25rem; }

/* ---------- split scroll ---------- */
.split { position: relative; }
.split__visual { position: sticky; top: 0; height: 100svh; display: grid; place-items: center; overflow: hidden; }
.split__scenes { position: relative; margin-top: -100svh; }
.scene { min-height: 100svh; display: flex; align-items: center; padding: 0 var(--pad); }
.scene .card {
  max-width: 34rem; margin-left: auto; padding: clamp(1.5rem, 3vw, 2.5rem);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--rule); border-radius: 4px;
}
.scene .card h3 { margin: .5rem 0 .75rem; }

/* the dial — sticky visual for the split scroll */
.dial { position: relative; width: min(70vw, 30rem); aspect-ratio: 1; }
.dial svg { width: 100%; height: 100%; overflow: visible; }
.dial__needle {
  transform-origin: 100px 100px; transform: rotate(var(--deg, -60deg));
  transition: transform 1.1s cubic-bezier(.4,1.4,.4,1);
}
.dial__label {
  position: absolute; inset: auto 0 42%; text-align: center;
  font-family: var(--font-display); letter-spacing: .18em; font-size: .8rem;
  text-transform: uppercase; color: var(--accent);
}
.dial__value {
  position: absolute; inset: 52% 0 auto; text-align: center;
  font-family: var(--font-display); font-size: clamp(2rem,6vw,3.25rem); font-weight: 700;
  color: #fff; letter-spacing: -.02em;
}

/* ---------- big figure ---------- */
.figure { text-align: center; padding: clamp(7rem, 22vh, 14rem) var(--pad); }
.figure .num {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -.04em;
  font-size: clamp(4.5rem, 20vw, 15rem); line-height: .85;
  background: linear-gradient(180deg, #fff 20%, var(--accent) 130%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.figure p { max-width: 32rem; margin: 2rem auto 0; }

/* ---------- ribbon (scroll-reactive waveform) ---------- */
.ribbon { padding: clamp(5rem, 14vh, 9rem) var(--pad); }
.ribbon .wrap { max-width: 60rem; margin: 0 auto; }
.ribbon canvas { display: block; width: 100%; height: 34vh; min-height: 180px; margin: 3rem 0; }

/* ---------- timeline ---------- */
.timeline { padding: clamp(5rem, 14vh, 9rem) var(--pad); }
.timeline .wrap { max-width: 46rem; margin: 0 auto; }
.tl-item {
  display: grid; grid-template-columns: 5.5rem 1fr; gap: clamp(1rem, 3vw, 2.5rem);
  padding: 1.75rem 0; border-top: 1px solid var(--rule); align-items: baseline;
}
.tl-item:last-child { border-bottom: 1px solid var(--rule); }
.tl-item .yr { font-family: var(--font-display); font-weight: 700; color: var(--accent); font-size: 1.1rem; }

/* ---------- pull line ---------- */
.pull { padding: clamp(6rem, 20vh, 12rem) var(--pad); text-align: center; }
.pull p {
  max-width: 22ch; margin: 0 auto; font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.8rem, 6vw, 4rem); line-height: 1.08; letter-spacing: -.02em;
}

/* ---------- outro ---------- */
.outro {
  min-height: 90svh; display: grid; place-content: center; text-align: center;
  padding: var(--pad); gap: 1.25rem;
  background: radial-gradient(60rem 40rem at 50% 120%,
              color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%);
}
.outro .name { font-family: var(--font-display); font-size: clamp(1.5rem,4vw,2.5rem); font-weight: 700; }
.outro .credit { font-size: .85rem; max-width: 36rem; margin: 0 auto; }
.outro a.home {
  justify-self: center; margin-top: 1.5rem; display: inline-block;
  padding: .85rem 1.6rem; border: 1px solid var(--rule); border-radius: 999px;
  color: var(--fg); text-decoration: none; font-size: .9rem;
  transition: border-color .25s, background .25s;
}
.outro a.home:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .scene .card { margin-left: 0; }
  .dial { width: 78vw; }
  .tl-item { grid-template-columns: 4rem 1fr; }
}

/* ---------- motion off ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .st-cue span { animation: none; }
  .dial__needle { transition: none; }
}