:root {
  --ink: #eafcff;
  --ink-dim: rgba(234, 252, 255, 0.66);
  --accent: #7be8d6;
  --glass: rgba(0, 12, 24, 0.38);
  --line: rgba(255, 255, 255, 0.12);
  --display: 'Space Grotesk', system-ui, sans-serif;
  --serif: 'Newsreader', Georgia, serif;
  --ui: 'Inter', system-ui, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  overflow: hidden;
  background: #0b4a5e;
  color: var(--ink);
  font-family: var(--ui);
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #031018; }

/* fallback gradient == first WebGL frame */
#bg-gradient {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: radial-gradient(ellipse 130vw 140vh at 50% -20%, #c9f7f2 8%, #62c6cf 32%, #14748c 62%, #0a3a55 100%);
}
#webgl {
  position: fixed; inset: 0; z-index: 1; display: block;
  width: 100%; height: 100%; touch-action: none;
}
#ui { position: fixed; inset: 0; z-index: 2; pointer-events: none; }

/* ---------- Loader (odometer) ---------- */
.loader-container {
  position: fixed; left: 40px; bottom: 40px; z-index: 100;
  display: flex; align-items: flex-end; gap: 8px; pointer-events: none;
  transition: opacity 0.8s ease;
}
body.is-ready .loader-container { opacity: 0; transition-delay: 1.6s; }
body:not(.is-ready) .panel { visibility: hidden; }

/* ---------- Gate: draw a zero ---------- */
.gate {
  position: absolute; inset: 0; z-index: 50; display: none; pointer-events: auto; touch-action: none; cursor: none;
  user-select: none; -webkit-user-select: none;
}
body.is-gate .gate { display: block; animation: gate-in 0.9s ease both; }
body.is-gate.is-ready .gate { display: block; pointer-events: none; opacity: 0; transition: opacity 0.9s ease; }
@keyframes gate-in { from { opacity: 0; } }
.gate-guide {
  position: absolute; left: 50%; top: 44%; width: min(380px, 72vw); aspect-ratio: 2 / 1; transform: translate(-50%, -50%);
  transition: opacity 0.5s, transform 0.8s;
}
.gate-guide svg { width: 100%; height: 100%; overflow: visible; }
.gate-path { stroke: rgba(4, 50, 78, 0.5); stroke-width: 1.6; stroke-dasharray: 3 5; stroke-linecap: round; }
.gate-dot { fill: #0a7f9a; filter: drop-shadow(0 0 6px #7be8d6); }
.gate.is-drawing .gate-guide, .gate.is-done .gate-guide { opacity: 0; transform: translate(-50%, -50%) scale(1.1); }
.gate-text { position: absolute; left: 0; right: 0; top: calc(44% + min(120px, 20vw)); text-align: center; padding: 0 24px; transition: opacity .4s; }
.gate-title { margin: 0 0 8px; font: 700 clamp(1.5rem, 3vw, 2.4rem)/1.1 var(--display); letter-spacing: -0.02em; color: #04283f; }
.gate-sub { margin: 0; font: 500 0.75rem var(--ui); letter-spacing: .18em; text-transform: uppercase; color: rgba(4, 40, 63, .7); }
.gate.is-error .gate-sub { color: #b5470b; }
.gate.is-done .gate-text { opacity: 0; }
.gate-skip {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%); padding: 8px 16px; border: 0; border-radius: 999px; cursor: pointer;
  background: transparent; color: rgba(4,40,63,.6); font: 500 0.72rem var(--ui); letter-spacing: .16em; text-transform: uppercase; transition: color .3s;
}
.gate-skip:hover { color: #04283f; }
.hud-xp { margin-left: 10px; }
.hud-xp-icon { color: var(--accent); }
.hud-xp.is-pop { animation: pop .7s cubic-bezier(.2,.9,.3,1.4); }
@keyframes pop { 40% { transform: scale(1.18); box-shadow: 0 0 0 10px rgba(123,232,214,.2); } }
.hud-left { display: flex; }
.xp-toast {
  position: absolute; left: 50%; top: 92px; transform: translate(-50%, -14px); padding: 12px 20px; border-radius: 999px; opacity: 0;
  background: var(--accent); color: #031018; font: 500 0.85rem var(--ui); pointer-events: none; transition: opacity .5s, transform .5s cubic-bezier(.2,.9,.3,1.3);
  box-shadow: 0 10px 30px rgba(0,0,0,.3);
}
.xp-toast b { font-family: var(--display); margin-right: 6px; }
.xp-toast.is-show { opacity: 1; transform: translate(-50%, 0); }
.loader-text {
  display: flex; overflow: hidden; line-height: 1;
  font: 700 clamp(5rem, 16.667svh, 12rem)/1 var(--display);
  color: var(--loader-ink, #fff);
  -webkit-mask-image: linear-gradient(transparent 0%, #000 25% 75%, transparent 100%);
  mask-image: linear-gradient(transparent 0%, #000 25% 75%, transparent 100%);
}
.loader-digit { display: inline-block; height: 1em; overflow: hidden; }
.loader-digit-inner {
  display: flex; flex-direction: column; will-change: transform;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.loader-digit-inner span { display: block; height: 1em; line-height: 1; }
.loader-degree {
  padding-bottom: 0.9rem; font: 400 0.85rem var(--ui);
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--loader-ink, #fff); opacity: .65;
}

/* ---------- Glass pills ---------- */
.pill {
  position: relative; display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--glass); color: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: saturate(120%) blur(14px); backdrop-filter: saturate(120%) blur(14px);
  font: 500 0.8rem var(--ui); letter-spacing: 0.04em; white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3), inset 0 1px rgba(255, 255, 255, 0.08);
  cursor: default;
}
button.pill { cursor: pointer; font-family: var(--ui); }
.pill::after, .hud-menu-dropdown::after {
  content: ''; position: absolute; inset: 0; padding: 1px; border-radius: inherit; pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,.4), rgba(255,255,255,0) 35% 65%, rgba(255,255,255,.4));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
}
button.pill:hover { background: rgba(0, 20, 36, 0.55); }

.hud {
  position: absolute; top: 24px; left: 28px; right: 28px;
  display: flex; justify-content: space-between; align-items: flex-start;
  opacity: 0; transform: translateY(-10px);
  transition: opacity 1s ease 0.4s, transform 1s ease 0.4s;
  pointer-events: none;
}
.hud > * { pointer-events: auto; }
body.is-ready .hud { opacity: 1; transform: none; }
.hud-right { display: flex; gap: 10px; }

.hud-depth-icon {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 10px var(--accent); animation: ping 2.4s ease-in-out infinite;
}
@keyframes ping { 50% { opacity: 0.35; transform: scale(0.7); } }
.hud-depth-label { color: var(--ink-dim); font-size: 0.7rem; letter-spacing: 0.14em; }
.hud-depth-value { font-family: var(--display); font-weight: 500; font-size: 0.95rem; font-variant-numeric: tabular-nums; min-width: 4ch; text-align: right; }
.hud-depth-unit { color: var(--ink-dim); margin-left: -4px; }

.wave { display: inline-flex; align-items: center; gap: 2px; height: 14px; }
.wave i { width: 2px; height: 3px; background: currentColor; border-radius: 2px; transition: height 0.3s; }
.hud-audio[aria-pressed='true'] .wave i { animation: eq 0.9s ease-in-out infinite; }
.wave i:nth-child(2) { animation-delay: 0.15s !important; }
.wave i:nth-child(3) { animation-delay: 0.3s !important; }
.wave i:nth-child(4) { animation-delay: 0.45s !important; }
@keyframes eq { 0%, 100% { height: 3px; } 50% { height: 14px; } }

.hud-menu { position: relative; }
.hud-menu-btn svg { transition: transform 0.3s; }
.hud-menu-btn[aria-expanded='true'] svg { transform: rotate(180deg); }
.hud-menu-dropdown {
  position: absolute; top: calc(100% + 10px); right: 0; min-width: 210px; padding: 7px;
  display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 16px;
  background: var(--glass); -webkit-backdrop-filter: saturate(120%) blur(14px); backdrop-filter: saturate(120%) blur(14px);
  box-shadow: 0 8px 24px rgba(0,0,0,.35), inset 0 1px rgba(255,255,255,.08);
  opacity: 0; transform: translateY(-6px); pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
}
.hud-menu-dropdown.is-open { opacity: 1; transform: none; pointer-events: auto; }
.hud-menu-item {
  display: flex; justify-content: space-between; gap: 18px; padding: 10px 12px; border: 0; border-radius: 10px;
  background: transparent; color: var(--ink-dim); font: 500 0.82rem var(--ui); cursor: pointer; text-align: left;
  transition: background 0.2s, color 0.2s;
}
.hud-menu-item small { opacity: 0.6; font-variant-numeric: tabular-nums; }
.hud-menu-item:hover { background: rgba(255,255,255,.08); color: #fff; }
.hud-menu-item.is-active { color: #fff; background: rgba(123, 232, 214, 0.16); }

/* ---------- Stage copy ---------- */
.stages { position: absolute; inset: 0; }
.panel {
  position: absolute; left: clamp(24px, 6vw, 96px); bottom: clamp(110px, 17vh, 190px);
  width: min(680px, calc(100vw - 48px)); opacity: 0; will-change: transform, opacity, filter;
  pointer-events: none;
}
.panel.is-active { pointer-events: auto; }
body.is-loading .panel { visibility: hidden; }
.kicker {
  margin: 0 0 18px; font: 500 0.75rem var(--ui); letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
}
.panel h1, .panel h2 {
  margin: 0 0 22px; font: 700 clamp(2.2rem, 5.6vw, 5rem)/1.02 var(--display); letter-spacing: -0.03em;
  text-wrap: balance; text-shadow: 0 2px 30px rgba(0, 20, 40, 0.35);
}
.panel em { font: italic 400 1.04em var(--serif); letter-spacing: -0.01em; color: #fff; }
.body { margin: 0; max-width: 46ch; font-size: clamp(0.95rem, 1.2vw, 1.1rem); line-height: 1.6; color: var(--ink-dim); }
.cta {
  margin-top: 28px; padding: 14px 24px; border: 0; border-radius: 999px; cursor: pointer;
  background: var(--accent); color: #031018; font: 700 0.95rem var(--display);
  transition: transform 0.3s cubic-bezier(.2,.8,.2,1), box-shadow 0.3s;
  box-shadow: 0 0 0 0 rgba(123,232,214,.5);
}
.cta:hover { transform: translateY(-2px); box-shadow: 0 0 0 8px rgba(123,232,214,.18); }

/* ---------- Depth ruler ---------- */
.ruler {
  position: absolute; right: 28px; top: 50%; height: min(54vh, 460px); width: 120px; transform: translateY(-50%);
  opacity: 0; transition: opacity 1s ease 0.8s; pointer-events: none;
}
body.is-ready .ruler { opacity: 1; }
.ruler-track { position: absolute; inset: 0; }
.tick {
  position: absolute; right: 0; height: 1px; width: 10px; background: rgba(255,255,255,.3); transition: background .4s, width .4s;
}
.tick.major { width: 22px; background: rgba(255,255,255,.55); }
.tick.is-near { background: #fff; width: 30px; }
.ruler-btn {
  position: absolute; right: 36px; transform: translateY(-50%); border: 0; background: none; cursor: pointer; pointer-events: auto;
  color: rgba(255,255,255,.5); font: 500 0.7rem var(--ui); letter-spacing: 0.12em; text-transform: uppercase; text-align: right; padding: 4px 0;
  transition: color .3s;
}
.ruler-btn:hover, .ruler-btn.is-active { color: #fff; }
.ruler-btn small { display: block; opacity: .6; font-size: .65rem; letter-spacing: .06em; }
.ruler-indicator {
  position: absolute; right: -4px; top: 0; width: 9px; height: 9px; margin-top: -4px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 14px var(--accent), 0 0 0 5px rgba(123,232,214,.18);
}

/* ---------- Next-stage button ---------- */
.next {
  position: absolute; right: 28px; bottom: 28px; width: 64px; height: 64px; padding: 0; border: 0; border-radius: 50%;
  background: var(--glass); color: #fff; cursor: pointer; pointer-events: auto;
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  display: grid; place-items: center; opacity: 0; transition: opacity 1s ease 1s, transform .3s;
}
body.is-ready .next { opacity: 1; }
.next:hover { transform: scale(1.06); }
.next svg { position: absolute; inset: 0; transform: rotate(-90deg); }
.next circle { fill: none; stroke-width: 2; }
.next-bg { stroke: rgba(255,255,255,.18); }
.next-ring { stroke: var(--accent); stroke-linecap: round; stroke-dasharray: 182.2; stroke-dashoffset: 182.2; }
.next-arrow { font-size: 1.1rem; }
.next-label {
  position: absolute; right: 78px; top: 50%; transform: translateY(-50%); white-space: nowrap;
  font: 500 0.7rem var(--ui); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-dim);
}

.scroll-hint {
  position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%); display: flex; gap: 10px; align-items: center;
  font: 500 0.7rem var(--ui); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-dim);
  opacity: 0; transition: opacity .8s;
}
body.is-ready:not(.has-scrolled) .scroll-hint { opacity: 1; transition-delay: 1.6s; }
.scroll-hint .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: bob 1.6s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(8px); opacity: .4; } }

/* ---------- Responsive / a11y ---------- */
@media (max-width: 768px) {
  .loader-container { left: 24px; bottom: 28px; }
  .hud { top: 16px; left: 16px; right: 16px; }
  .hud-audio-label, .hud-depth-label { display: none; }
  .ruler { right: 14px; width: 24px; }
  .ruler-btn { display: none; }
  .next { right: 16px; bottom: 20px; width: 56px; height: 56px; }
  .next-label, .scroll-hint { display: none; }
  .panel { bottom: 110px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
}

/* ---------- Final stage: glass card + station controls (text never sits on the scenery) ---------- */
.panel[data-i='4'] {
  width: min(440px, calc(100vw - 48px)); padding: 26px 28px 28px; border-radius: 24px; bottom: clamp(190px, 24vh, 260px);
  background: rgba(3, 14, 28, 0.68); border: 1px solid rgba(255, 255, 255, 0.14);
  -webkit-backdrop-filter: blur(18px) saturate(130%); backdrop-filter: blur(18px) saturate(130%);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), inset 0 1px rgba(255, 255, 255, 0.08);
}
.panel[data-i='4'] h2 { font-size: clamp(1.8rem, 3.1vw, 2.7rem); text-shadow: none; }
.panel[data-i='4'] .body { color: rgba(234, 252, 255, 0.84); }
.panel[data-i='4'] .kicker { margin-bottom: 14px; }

.dock, .joy, .zoomc { opacity: 0; pointer-events: none; transition: opacity 0.7s ease, transform 0.7s cubic-bezier(.2,.8,.2,1); }
body.at-end .dock, body.at-end .joy, body.at-end .zoomc { opacity: 1; pointer-events: auto; transform: none; }
.dock {
  position: absolute; left: 50%; bottom: 26px; transform: translate(-50%, 16px); display: flex; align-items: center; gap: 14px;
  padding: 7px 8px 7px 10px; border-radius: 999px; border: 1px solid var(--line); background: rgba(3, 14, 28, 0.72);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); box-shadow: 0 10px 30px rgba(0,0,0,.45), inset 0 1px rgba(255,255,255,.08);
}
.dock-orb { width: 34px; height: 34px; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #d9fff5, #3fe0bd 55%, #0e7f72); box-shadow: 0 0 18px rgba(63,224,189,.6); }
.dock-text { font: 500 0.8rem var(--ui); letter-spacing: .02em; color: rgba(234,252,255,.8); white-space: nowrap; }
.dock-btn { padding: 11px 20px; border: 0; border-radius: 999px; background: #eafcff; color: #031018; font: 700 0.85rem var(--display); cursor: pointer; transition: transform .25s, background .25s; }
.dock-btn:hover { transform: scale(1.04); background: var(--accent); }

.joy {
  position: absolute; left: 28px; bottom: 28px; width: 124px; height: 124px; border-radius: 50%; transform: translateY(16px); touch-action: none;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,.22), rgba(255,255,255,.07)); border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); box-shadow: 0 10px 30px rgba(0,0,0,.4), inset 0 1px rgba(255,255,255,.15); display: grid; place-items: center;
}
.joy-knob { width: 54px; height: 54px; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #4a5560, #0d1218); box-shadow: 0 6px 14px rgba(0,0,0,.5); transition: transform .2s cubic-bezier(.2,.8,.2,1); }

.zoomc {
  position: absolute; right: 28px; bottom: 108px; width: 132px; height: 132px; transform: translateY(16px);
  display: grid; grid-template: repeat(3, 1fr) / repeat(3, 1fr); gap: 4px;
}
.zoomc button {
  border: 1px solid var(--line); border-radius: 50%; background: rgba(40, 52, 62, 0.62); color: #fff; font: 500 1.1rem var(--ui); cursor: pointer;
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: 0 6px 16px rgba(0,0,0,.35), inset 0 1px rgba(255,255,255,.12); transition: background .25s, transform .2s;
}
.zoomc button:hover { background: rgba(70, 90, 104, 0.8); transform: scale(1.06); }
#zoom-in { grid-area: 1 / 2; } #rot-l { grid-area: 2 / 1; } #rot-r { grid-area: 2 / 3; } #zoom-out { grid-area: 3 / 2; }

.poi {
  position: absolute; left: 0; top: 0; z-index: 3; opacity: 0; pointer-events: none; transition: opacity 0.5s; padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(3, 14, 28, 0.7); color: #fff; cursor: pointer; white-space: nowrap;
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: 0 6px 18px rgba(0,0,0,.4); font: 500 0.76rem var(--ui); letter-spacing: .06em;
}
.poi.is-on { opacity: 1; pointer-events: auto; }
.poi:hover { background: rgba(10, 40, 56, 0.9); border-color: var(--accent); }
.poi i { font-style: normal; color: var(--accent); margin-right: 7px; }
.poi small { margin-left: 9px; opacity: .55; font-size: .68rem; }

@media (max-width: 768px) {
  .dock-text { display: none; }
  .joy { width: 96px; height: 96px; left: 16px; bottom: 90px; } .joy-knob { width: 42px; height: 42px; }
  .zoomc { right: 16px; bottom: 92px; width: 108px; height: 108px; }
  .dock { bottom: 16px; }
  .panel[data-i='4'] { bottom: 230px; }
}