/* ============ EPHEMERIS ============ */
:root {
  --black: #050505;
  --white: #F2F2F0;
  --dim: #8A8A85;
  --pad: clamp(1.25rem, 4vw, 4rem);
  --mono: 'IBM Plex Mono', monospace;
  --grot: 'Space Grotesk', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--black);
  color: var(--white);
  font-family: var(--grot);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--white); color: var(--black); }

#gl {
  position: fixed; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  display: block;
}

/* ---------- loader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 50;
  background: var(--black);
  display: grid; place-items: center; place-content: center; gap: 1.5rem;
  transition: opacity 0.8s ease 0.2s;
}
.loader.is-done { opacity: 0; pointer-events: none; }
.loader-ring {
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--white) 25%, transparent);
  border-top-color: var(--white);
  animation: spin 0.9s linear infinite;
}
.loader-text {
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.35em;
  color: var(--dim);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- no-gl fallback ---------- */
.no-gl[hidden] { display: none; }
.no-gl {
  position: fixed; inset: 0; z-index: 60;
  background: var(--black);
  display: grid; place-items: center; place-content: center; gap: 1rem;
  text-align: center; padding: 2rem; line-height: 1.7; color: var(--dim);
}
.no-gl-title { font-size: 2rem; letter-spacing: 0.3em; color: var(--white); }

/* ---------- HUD ---------- */
.hud { position: fixed; z-index: 20; pointer-events: none; }
.hud-top {
  top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 1.3rem var(--pad);
  mix-blend-mode: difference;
}
.wordmark { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.42em; font-weight: 400; }
.hud-note { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.3em; color: var(--dim); }

.hud-rail { top: 50%; right: calc(var(--pad) * 0.55); transform: translateY(-50%); }
.rail { position: relative; width: 1px; height: 34vh; background: color-mix(in srgb, var(--white) 18%, transparent); }
.rail-fill { position: absolute; top: 0; left: 0; width: 100%; height: 0%; background: var(--white); }
.rail-tick { position: absolute; left: -2.5px; width: 6px; height: 1px; background: color-mix(in srgb, var(--white) 45%, transparent); }

.hud-tel {
  left: var(--pad); bottom: 1.2rem;
  display: flex; gap: 1.75rem;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--dim) 80%, transparent);
}

/* ---------- panels ---------- */
main { position: relative; z-index: 10; }
.panel { position: relative; padding: 0 var(--pad); }

.panel-hero {
  height: 100svh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center;
}
.kicker {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.35em;
  color: var(--dim); text-transform: uppercase;
  margin-bottom: 2rem;
}
.title {
  font-size: clamp(3rem, 11vw, 10rem);
  font-weight: 300;
  letter-spacing: 0.14em;
  text-indent: 0.14em;
  line-height: 1;
  text-shadow: 0 0 80px rgba(122, 135, 255, 0.35);
}
.sub {
  margin-top: 2.2rem; color: var(--dim);
  font-weight: 300; font-size: clamp(0.95rem, 1.4vw, 1.15rem); line-height: 1.75;
}
.cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.8rem;
}
.cue-line { width: 1px; height: 3.4rem; background: color-mix(in srgb, var(--white) 40%, transparent); overflow: hidden; position: relative; }
.cue-line::after {
  content: ''; position: absolute; inset: 0; background: var(--white);
  animation: cue 2s cubic-bezier(0.7, 0, 0.3, 1) infinite;
}
@keyframes cue { 0% { transform: translateY(-100%); } 60% { transform: translateY(0); } 100% { transform: translateY(101%); } }
.cue-text { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.4em; color: var(--dim); }

.panel-chapter {
  height: 160svh;
  display: flex; align-items: center;
}
.panel-chapter .ch { position: sticky; top: 30vh; max-width: 30rem; }
.panel-chapter--right { justify-content: flex-end; }
.ch-num {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.35em;
  color: var(--dim); margin-bottom: 1.4rem;
}
.ch-title {
  font-size: clamp(2.4rem, 5.4vw, 4.6rem);
  font-weight: 300; line-height: 1.04; letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}
.ch-text { color: var(--dim); font-weight: 300; line-height: 1.75; font-size: clamp(0.92rem, 1.2vw, 1.05rem); max-width: 42ch; }

.panel-end {
  height: 100svh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center;
}
.end-line { font-size: clamp(2rem, 5vw, 4rem); font-weight: 300; letter-spacing: 0.02em; }
.end-small { margin-top: 1.6rem; color: var(--dim); font-weight: 300; line-height: 1.8; font-size: 0.95rem; }
.end-restart {
  margin-top: 3rem; color: var(--white); text-decoration: none;
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.35em;
  border: 1px solid color-mix(in srgb, var(--white) 30%, transparent);
  border-radius: 999px; padding: 0.85rem 1.8rem;
  transition: background 0.3s, color 0.3s, border-color 0.3s;
}
.end-restart:hover { background: var(--white); color: var(--black); border-color: var(--white); }
.end-colophon {
  position: absolute; bottom: 1.4rem;
  font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.22em;
  color: color-mix(in srgb, var(--dim) 65%, transparent);
}

/* ---------- reveals ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 1s ease, transform 1s cubic-bezier(0.2, 0.8, 0.2, 1); }
.reveal.is-in { opacity: 1; transform: none; }
.ch { opacity: 0; transform: translateY(30px); transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.2, 0.8, 0.2, 1); }
.ch.is-in { opacity: 1; transform: none; }

@media (max-width: 700px) {
  .hud-tel { display: none; }
  .hud-rail { display: none; }
  .panel-chapter .ch { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .ch { opacity: 1; transform: none; transition: none; }
  .cue-line::after { animation: none; }
  .loader-ring { animation: none; }
}