/* ===========================================================================
   Eternal — interactive disintegration artwork
   =========================================================================== */

:root {
  --bg: #050506;          /* near-black backdrop                       */
  --glow: #1c1b24;        /* faint cool glow behind the bust          */
  --ink: rgba(235, 230, 222, 0.85);
  --ink-dim: rgba(235, 230, 222, 0.4);
  --panel-bg: rgba(12, 12, 14, 0.72);
  --panel-border: rgba(235, 230, 222, 0.12);
  --accent: #d8cfc2;      /* warm off-white marble tone               */
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  width: 100%;
  background: var(--bg);
  color: var(--ink);
  overflow: hidden;
  font-family: "Cormorant Garamond", "Georgia", "Times New Roman", serif;
  /* don't let touch gestures scroll/zoom while painting dust */
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
}

/* --- atmospheric glow ----------------------------------------------------- */
/* A soft radial light behind the figure recreates the photo's vignette so the
   transparent canvas has something luminous to sit on. */
.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(60% 70% at 50% 42%, var(--glow) 0%, rgba(10, 10, 12, 0.6) 45%, var(--bg) 78%),
    var(--bg);
  pointer-events: none;
}

/* --- canvas --------------------------------------------------------------- */
#scene {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* --- caption -------------------------------------------------------------- */
.caption {
  position: fixed;
  left: clamp(20px, 4vw, 56px);
  bottom: clamp(18px, 4vh, 48px);
  z-index: 3;
  pointer-events: none;
  user-select: none;
  animation: rise 2.4s ease both;
}
.caption h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 72px);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-shadow: 0 2px 40px rgba(0, 0, 0, 0.8);
}
.caption p {
  margin: 0.35em 0 0;
  font-size: clamp(12px, 1.4vw, 16px);
  letter-spacing: 0.22em;
  text-transform: lowercase;
  color: var(--ink-dim);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

/* --- control panel -------------------------------------------------------- */
.panel {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 4;
  width: 268px;
  background: var(--panel-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.45s ease;
}
.panel.collapsed {
  transform: translateX(calc(100% + 18px));
  opacity: 0.0;
}

.panel__toggle {
  position: absolute;
  top: 0;
  left: -52px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--accent);
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.4s ease, color 0.3s ease;
}
.panel__toggle:hover { color: #fff; transform: rotate(90deg); }

.panel__body { padding: 18px 18px 16px; }
.panel__body h2 {
  margin: 0 0 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.panel label {
  display: block;
  margin: 0 0 13px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
  position: relative;
}
.panel .val {
  position: absolute;
  right: 0;
  top: 0;
  font-variant-numeric: tabular-nums;
  color: var(--ink-dim);
  font-size: 11px;
}

/* slider styling */
.panel input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  margin: 9px 0 0;
  border-radius: 3px;
  background: rgba(235, 230, 222, 0.18);
  outline: none;
}
.panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(216, 207, 194, 0.12);
  transition: transform 0.15s ease;
}
.panel input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }
.panel input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.panel__reset {
  margin-top: 4px;
  width: 100%;
  padding: 8px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: transparent;
  color: var(--ink-dim);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.panel__reset:hover { color: var(--ink); border-color: var(--ink-dim); }

/* --- music toggle --------------------------------------------------------- */
.sound {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 4;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--accent);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
}
.sound:hover { color: #fff; transform: scale(1.06); }
.sound.muted { opacity: 0.55; color: var(--ink-dim); }
/* diagonal slash when muted */
.sound.muted::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* --- fullscreen hint ------------------------------------------------------ */
.hint {
  position: fixed;
  left: 50%;
  bottom: clamp(20px, 5vh, 48px);
  transform: translateX(-50%);
  z-index: 3;
  pointer-events: none;
  user-select: none;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: lowercase;
  color: rgba(235, 230, 222, 0.42);
  /* visible briefly, then fades away */
  animation: hintFade 5s ease forwards;
}
.hint kbd {
  font-family: inherit;
  font-size: 11px;
  padding: 1px 6px;
  border: 1px solid rgba(235, 230, 222, 0.3);
  border-radius: 5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
@keyframes hintFade {
  0%   { opacity: 0; }
  15%  { opacity: 1; }
  70%  { opacity: 1; }
  100% { opacity: 0; }
}

/* --- loader --------------------------------------------------------------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--ink-dim);
  letter-spacing: 0.3em;
  text-transform: lowercase;
  font-size: 14px;
  transition: opacity 0.8s ease;
}
.loader span { animation: pulse 1.8s ease-in-out infinite; }
.loader.hidden { opacity: 0; pointer-events: none; }

@keyframes pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 0.9; } }

@media (max-width: 640px) {
  .panel { width: 240px; }
}