:root {
  --bg: #080a0f;
  --surface: #0e1118;
  --ink: #e8e6e1;
  --muted: rgba(232, 230, 225, 0.55);
  --faint: rgba(232, 230, 225, 0.10);
  --primary: #c8a96e;
  --ray-col: rgba(200, 169, 110, 0.35);
  --year-col: rgba(200, 169, 110, 0.60);
  --text-meta: 0.7rem;
  --text-body: 1rem;
  --text-title: clamp(1rem, 1.8vw, 1.4rem);
  --text-exp: clamp(1.4rem, 2.2vw, 2rem);

  --serif: 'Literata', Georgia, serif;
  --mono: 'Red Hat Mono', Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
}

body {
  position: fixed;
  inset: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  touch-action: none;
}

#ptv3-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
}

#ptv3-scene {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Atmospheric depth: a faint warm glow at the vanishing point and a soft
   vignette that darkens the edges to focus the eye on the corridor. */
#ptv3-vignette {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(58% 50% at 50% 30%,
      rgba(200, 169, 110, 0.07) 0%,
      transparent 60%),
    radial-gradient(120% 120% at 50% 48%,
      transparent 44%,
      rgba(6, 8, 12, 0.62) 100%);
}

/* ── Cards layer ─────────────────────────────── */
.ptv3-cards {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
}

.ptv3-card {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.7rem 0.9rem;
  background: rgba(14, 17, 24, 0.82);
  border: 1px solid rgba(232, 230, 225, 0.12);
  border-radius: 7px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(7px);
  backdrop-filter: blur(7px);
  cursor: pointer;
  will-change: left, top, opacity;
  transition: background 160ms ease, box-shadow 220ms ease, border-color 160ms ease;
}

.ptv3-card:hover,
.ptv3-card:focus-visible {
  background: rgba(200, 169, 110, 0.06);
  outline: none;
}

/* Focused card: a soft gold glow (not a border) to establish hierarchy. */
.ptv3-card.is-active {
  background: rgba(200, 169, 110, 0.12);
  border-color: rgba(200, 169, 110, 0.35);
  box-shadow: 0 0 36px rgba(200, 169, 110, 0.22), 0 10px 30px rgba(0, 0, 0, 0.5);
}

.ptv3-card-meta {
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  line-height: 1.2;
}

.ptv3-card-title {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
}

/* ── Year labels ─────────────────────────────── */
.ptv3-year-label {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 5;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--year-col);
  pointer-events: none;
  white-space: nowrap;
  transform: translateY(-50%);
  will-change: left, top, opacity;
}

/* ── Expanded panel ──────────────────────────── */
.ptv3-expanded {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%) translateX(12px);
  width: 320px;
  max-width: calc(100vw - 4rem);
  z-index: 8;
  padding: 1.5rem;
  background: rgba(14, 17, 24, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(232, 230, 225, 0.10);
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease, transform 220ms ease;
}

.ptv3-expanded.is-open {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
  pointer-events: auto;
}

.ptv3-exp-meta {
  display: block;
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.ptv3-exp-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: var(--text-exp);
  line-height: 1.15;
  margin: 0 0 0.85rem;
  color: var(--ink);
}

.ptv3-exp-desc {
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--text-body);
  line-height: 1.55;
  margin: 0 0 1.25rem;
  color: var(--muted);
}

.ptv3-exp-link {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 169, 110, 0.4);
  padding-bottom: 2px;
  transition: border-color 160ms ease;
}

.ptv3-exp-link:hover {
  border-color: var(--primary);
}

.ptv3-exp-link.is-hidden {
  display: none;
}

/* ── Nav ─────────────────────────────────────── */
.ptv3-nav {
  position: fixed;
  top: 1.5rem;
  left: 2rem;
  z-index: 10;
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.ptv3-nav a {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms ease;
}

.ptv3-nav a:hover,
.ptv3-nav a:focus-visible {
  color: var(--primary);
  outline: none;
}

/* ── HUD ─────────────────────────────────────── */
.ptv3-hud {
  position: fixed;
  bottom: 1.5rem;
  left: 2rem;
  z-index: 10;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Controls ────────────────────────────────── */
.ptv3-controls {
  position: fixed;
  bottom: 1.5rem;
  right: 2rem;
  z-index: 10;
  display: flex;
  gap: 0.5rem;
}

.ptv3-ctrl {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--ink);
  background: rgba(14, 17, 24, 0.72);
  border: 1px solid rgba(232, 230, 225, 0.10);
  border-radius: 6px;
  cursor: pointer;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: background 160ms ease, color 160ms ease;
}

.ptv3-ctrl:hover,
.ptv3-ctrl:focus-visible {
  background: rgba(200, 169, 110, 0.06);
  color: var(--primary);
  outline: none;
}

@media (max-width: 640px) {
  .ptv3-nav {
    left: 1rem;
    gap: 0.9rem;
  }
  .ptv3-hud {
    left: 1rem;
  }
  .ptv3-controls {
    right: 1rem;
  }
  .ptv3-expanded {
    right: 1rem;
    left: 1rem;
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ptv3-card,
  .ptv3-expanded,
  .ptv3-year-label {
    transition: none;
  }
}