/* Hallmark · genre: atmospheric · macrostructure: Marquee Hero → timed stage (single-screen experience) · theme: custom "Copper Hall" (shared tokens.css)
 * tone: immersive, cinematic, restrained · anchor hue: 52° copper · enrichment: WebGL line-space reacting to pre-analysed bass / mid / high
 * nav: N9 edge-aligned HUD · footer: none (hands off to details.html)
 */

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
html { background: var(--color-paper-deep); overflow: clip; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0; overflow: clip; background: var(--color-paper-deep); color: var(--color-ink);
  font-family: var(--font-body); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
p, h1, ol { margin: 0; padding: 0; }
ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wm { text-transform: none; }

#gl { position: fixed; inset: 0; width: 100%; height: 100%; display: block; z-index: 0; }
.grid-fallback { display: none; position: fixed; inset: 0; z-index: 0;
  background:
    linear-gradient(var(--color-rule) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--color-rule) 1px, transparent 1px) 0 0 / 48px 48px; }
.no-gl .grid-fallback { display: block; }
.no-gl #gl { display: none; }

/* ---------- HUD ---------- */
.hud-top {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--space-md);
  padding: calc(env(safe-area-inset-top, 0px) + var(--space-md)) var(--gutter) var(--space-md);
  font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-muted);
}
.brand { color: var(--color-ink-2); white-space: nowrap; }
.brand .dot { color: var(--color-signal); }
.brand .wm { font-family: var(--font-display); font-weight: 700; font-size: var(--text-sm); letter-spacing: -0.01em; color: var(--color-ink); }
.hud-chapter { justify-self: center; white-space: nowrap; overflow: hidden; transition: opacity var(--dur-mid) var(--ease-out); }
.hud-chapter span { display: inline-block; transition: opacity var(--dur-mid) var(--ease-out), transform var(--dur-mid) var(--ease-out); }
.hud-chapter span.swap { opacity: 0; transform: translateY(40%); }
.skip {
  justify-self: end; white-space: nowrap; padding: var(--space-xs) 0; border-bottom: 1px solid var(--color-rule-firm);
  color: var(--color-ink-2); transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.skip:hover { color: var(--color-signal); border-color: var(--color-signal); }

/* ---------- intro ---------- */
.intro {
  position: fixed; inset: 0; z-index: 10; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 0 var(--gutter) calc(env(safe-area-inset-bottom, 0px) + clamp(2.5rem, 9vh, 6rem));
  transition: opacity 900ms var(--ease-out), transform 1200ms var(--ease-out);
}
body:not(.is-intro) .intro { opacity: 0; transform: translateY(-3vh); pointer-events: none; visibility: hidden; transition: opacity 900ms var(--ease-out), transform 1200ms var(--ease-out), visibility 0s 900ms; }
.intro-k { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-ink-2); margin-bottom: var(--space-lg); }
.intro-k span { color: var(--color-signal); }
.intro-h {
  font-family: var(--font-display); font-weight: 800; font-style: normal; text-transform: uppercase;
  font-size: clamp(1.6rem, 8.4vw, 9.5rem); line-height: 0.88; letter-spacing: -0.045em; min-width: 0;
}
.intro-play { display: flex; align-items: center; gap: var(--space-xl); margin-top: clamp(2rem, 6vh, 4rem); }
.play {
  position: relative; flex: none; width: 104px; height: 104px; border-radius: 50%; display: grid; place-items: center;
  background: var(--color-ink); color: var(--color-paper);
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), opacity var(--dur-mid) var(--ease-out);
}
.play svg { width: 34px; height: 34px; fill: currentColor; transform: translateX(2px); }
.play-ring { position: absolute; inset: -12px; border-radius: 50%; border: 1px solid var(--color-rule-firm); transition: transform var(--dur-slow) var(--ease-out), border-color var(--dur-mid) var(--ease-out); }
.play:not(:disabled) .play-ring { border-color: var(--color-signal); animation: breathe 2.8s var(--ease-in-out) infinite; }
.play:hover:not(:disabled) { background: var(--color-signal); color: var(--color-signal-ink); }
.play:active:not(:disabled) { transform: scale(0.96); }
.play:disabled { opacity: 0.45; cursor: progress; }
@keyframes breathe { 50% { transform: scale(1.1); opacity: 0.35; } }
.intro-lbl { font-family: var(--font-display); font-weight: 500; font-size: var(--text-xl); letter-spacing: -0.02em; line-height: 1.1; }
.intro-sub { margin-top: var(--space-xs); font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-faint); }

/* ---------- stage text ---------- */
.stage-text {
  position: fixed; inset: 0; z-index: 8; display: grid; place-items: center; text-align: center;
  padding: 0 var(--gutter); pointer-events: none;
}
.st-block { grid-area: 1 / 1; display: grid; justify-items: center; gap: var(--space-sm); width: min(100%, 64rem); }
.st-sub { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-signal); margin-bottom: var(--space-sm); }
.st-line {
  font-family: var(--font-display); font-weight: 700; font-style: normal;
  font-size: clamp(1.9rem, 5.6vw, 5.5rem); line-height: 1; letter-spacing: -0.035em;
  max-width: 16ch; text-wrap: balance;
  text-shadow: 0 0 28px var(--color-paper-deep), 0 0 60px var(--color-paper-deep);
}
.st-line + .st-line { color: var(--color-ink-2); }
.st-line .w { display: inline-block; opacity: 0; filter: blur(10px); transform: translateY(0.25em);
  transition: opacity 900ms var(--ease-out), filter 900ms var(--ease-out), transform 900ms var(--ease-out);
  transition-delay: calc(var(--i) * 70ms + var(--d, 0ms)); }
.st-block.in .w { opacity: 1; filter: blur(0); transform: none; }
.st-block.out { opacity: 0; filter: blur(8px); transform: translateY(-0.4em); transition: opacity 600ms var(--ease-in), filter 600ms var(--ease-in), transform 600ms var(--ease-in); }
.st-block.out .w { transition-delay: 0ms; }

/* ---------- caption (while music plays) ---------- */
.caption {
  position: fixed; left: var(--gutter); bottom: calc(env(safe-area-inset-bottom, 0px) + 6.5rem); z-index: 12; max-width: min(34rem, 70vw);
  opacity: 0; transform: translateY(10px); transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
}
.caption.on { opacity: 1; transform: none; }
.caption, .telemetry, .meters { pointer-events: none; } /* never blocks controls */
.cap-k { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-signal); }
.caption { text-shadow: 0 0 24px var(--color-paper-deep); }
.cap-t { margin-top: var(--space-xs); font-family: var(--font-display); font-weight: 700; font-size: var(--text-xl); letter-spacing: -0.025em; line-height: 1.05; }

/* ---------- meters ---------- */
.meters {
  position: fixed; right: var(--gutter); bottom: calc(env(safe-area-inset-bottom, 0px) + 6.5rem); z-index: 12;
  display: flex; gap: var(--space-md); align-items: flex-end;
  opacity: 0; transition: opacity 700ms var(--ease-out);
}
body.is-running .meters { opacity: 1; }
.m { display: flex; flex-direction: column; align-items: center; gap: var(--space-xs); }
.m-bar { position: relative; width: 4px; height: 56px; background: var(--color-rule); overflow: hidden; transition: box-shadow 200ms var(--ease-out); }
.m-bar i { position: absolute; inset: 0; background: var(--color-signal); transform-origin: bottom; transform: scaleY(0); }
.m.hit .m-bar { box-shadow: 0 0 14px var(--color-signal); }
.m-l { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-faint); }

/* ---------- transport ---------- */
.transport {
  position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom, 0px) + var(--space-lg)); z-index: 14;
  display: flex; align-items: center; gap: var(--space-sm);
  width: min(calc(100% - 2 * var(--gutter)), 52rem); transform: translate(-50%, 16px); opacity: 0; pointer-events: none; visibility: hidden;
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out), visibility 0s 700ms;
}
body.is-running .transport { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; visibility: visible; transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out), visibility 0s; }
.t-btn { flex: none; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--color-rule-firm); color: var(--color-ink-2);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.t-btn svg { width: 16px; height: 16px; fill: currentColor; grid-area: 1 / 1; }
.t-btn:hover { color: var(--color-ink); border-color: var(--color-signal); }
.t-btn:active { background: var(--color-paper-3); }
#tPause .i-play { opacity: 0; }
body.is-paused #tPause .i-play { opacity: 1; }
body.is-paused #tPause .i-pause { opacity: 0; }
.chapters { flex: 1; min-width: 0; display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 6px; }
.ch { min-width: 0; }
.ch button { width: 100%; display: flex; flex-direction: column; gap: 7px; padding: var(--space-xs) 0; text-align: left; }
.ch-bar { display: block; height: 2px; background: var(--color-rule-firm); position: relative; overflow: hidden; }
.ch-bar i { position: absolute; inset: 0; background: var(--color-signal); transform-origin: left; transform: scaleX(var(--p, 0)); }
.ch-l { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: color var(--dur-fast) var(--ease-out); }
.ch.is-on .ch-l, .ch button:hover .ch-l { color: var(--color-ink); }

/* ---------- veil / hand-off ---------- */
.veil { position: fixed; inset: 0; z-index: 30; background: var(--color-paper-deep); opacity: 0; pointer-events: none; transition: opacity 1400ms var(--ease-in-out); }
.veil.on { opacity: 1; pointer-events: auto; }
.noscript { position: fixed; inset: auto var(--gutter) var(--gutter); z-index: 40; color: var(--color-ink-2); }

body.is-intro .hud-chapter { opacity: 0; }

@media (max-width: 720px) {
  .hud-top { grid-template-columns: 1fr auto; }
  .hud-chapter { display: none; }
  .intro-play { gap: var(--space-lg); }
  .play { width: 84px; height: 84px; }
  .play svg { width: 28px; height: 28px; }
  .caption { bottom: calc(env(safe-area-inset-bottom, 0px) + 6rem); max-width: calc(100% - 2 * var(--gutter) - 5.5rem); }
  .meters { bottom: calc(env(safe-area-inset-bottom, 0px) + 6rem); gap: var(--space-sm); }
  .m-bar { height: 40px; }
  .ch-l { display: none; }
  .ch button { padding: var(--space-md) 0; }
}
@media (max-width: 560px) {
  .brand .bp, .brand .dot { display: none; }   /* phones: wordmark only; the intro still says "Private presentation" */
}

@media (prefers-reduced-motion: reduce) {
  .st-line .w { filter: none; transform: none; transition: opacity 150ms linear; transition-delay: 0ms; }
  .st-block.out { filter: none; transform: none; transition: opacity 150ms linear; }
  .intro, .caption, .transport, .hud-chapter span { transition: opacity 150ms linear; transform: none !important; }
  body.is-running .transport { transform: translate(-50%, 0) !important; }
  .transport { transform: translate(-50%, 0) !important; }
  .play-ring { animation: none !important; }
  .veil { transition: opacity 300ms linear; }
}