/* ==========================================================================
   AE4Play — layout: header, stage meter, footer, section rhythm
   ========================================================================== */

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-inline: var(--gutter);
  transition: transform .5s var(--ease-out), background-color .4s ease;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(to bottom, rgba(7, 6, 11, .85), rgba(7, 6, 11, 0));
  opacity: 0;
  transition: opacity .4s ease;
  pointer-events: none;
}
.site-header.is-scrolled::before { opacity: 1; }
.site-header.is-hidden { transform: translateY(-110%); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--acid);
}
.brand__mark { width: 34px; height: 34px; transition: transform .5s var(--ease-out); }
.brand:hover .brand__mark { transform: rotate(-12deg) scale(1.06); }
.brand__word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: -.02em;
  color: var(--paper);
}

.site-nav { margin-left: auto; }
.site-nav ul { display: flex; gap: clamp(1rem, 2.4vw, 2.2rem); }
.site-nav a {
  position: relative;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding-block: .4rem;
  color: var(--paper);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--acid);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .4s var(--ease-out);
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }

.sound-toggle {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  height: 38px;
  padding: 0 .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .04em;
  background: rgba(17, 15, 26, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color .3s ease, color .3s ease;
}
.sound-toggle:hover { border-color: var(--acid); }
.sound-toggle b { font-weight: 700; color: var(--paper-dim); }
.sound-toggle[aria-pressed="true"] b { color: var(--acid); }
.sound-toggle__bars { display: inline-flex; align-items: flex-end; gap: 2px; height: 12px; }
.sound-toggle__bars i {
  width: 2px;
  height: 3px;
  background: currentColor;
  transition: height .3s ease;
}
.sound-toggle[aria-pressed="true"] .sound-toggle__bars i {
  background: var(--acid);
  animation: eq .9s ease-in-out infinite alternate;
}
.sound-toggle[aria-pressed="true"] .sound-toggle__bars i:nth-child(2) { animation-delay: -.3s; }
.sound-toggle[aria-pressed="true"] .sound-toggle__bars i:nth-child(3) { animation-delay: -.6s; }
.sound-toggle[aria-pressed="true"] .sound-toggle__bars i:nth-child(4) { animation-delay: -.15s; }
@keyframes eq { from { height: 3px; } to { height: 12px; } }

@media (max-width: 760px) {
  .site-nav { display: none; }
  .sound-toggle { margin-left: auto; }
}

/* ---------- Stage meter (fixed level progress) ---------- */
.stage-meter {
  position: fixed;
  right: calc(var(--gutter) * .55);
  top: 50%;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: .8rem;
  transform: translateY(-50%) rotate(180deg);
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--paper-dim);
  pointer-events: none;
  opacity: 0;
  transition: opacity .6s ease;
}
.is-ready .stage-meter { opacity: 1; }
.stage-meter__track {
  position: relative;
  width: 2px;
  height: 120px;
  background: var(--line);
  overflow: hidden;
}
.stage-meter__fill {
  position: absolute;
  inset: 0;
  background: var(--acid);
  transform-origin: bottom;
  transform: scaleY(0);
}
@media (max-width: 1199px) { .stage-meter { display: none; } }

/* ---------- Section rhythm ---------- */
main > section { position: relative; }

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  padding-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.site-footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem 2rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--paper-dim);
}
.site-footer__egg { opacity: .55; }
.site-footer__top {
  color: var(--paper);
  border-bottom: 1px solid var(--acid);
  padding-bottom: 2px;
}
.site-footer__top:hover { color: var(--acid); }

.wordmark {
  display: flex;
  justify-content: space-between;
  margin-top: clamp(1.5rem, 4vw, 3rem);
  padding-inline: calc(var(--gutter) * .5);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 16.2vw, 19rem);
  line-height: .78;
  letter-spacing: -.06em;
  color: var(--paper);
  white-space: nowrap;
  transform: translateY(.06em);
}
.wordmark span:first-child { color: var(--paper); }
.wordmark span:last-child { color: var(--acid); }