/* custom properties */

:root {
  --color-triori: #1c4828;
  --color-triori-light: #399251;
  --color-triori-dark: #0e2414;
  --color-muse: #8b3404;
  --color-muse-light: #e45507;
  --color-muse-lightish: #c04806;
  --color-muse-darkish: #6b2803;
  --color-muse-dark: #451a02;
  --color-zeteo: #371a4d;
  --color-zeteo-light: #6d3499;
  --color-zeteo-dark: #1b0d26;
  --color-hub: #104862;
  --color-hub-ring: #a6caec;
  --transition-slice: 0.38s cubic-bezier(0.34, 1.1, 0.64, 1);
  --icon-size: 2.4rem;
  --label-font: 1.5rem;
}

/* base */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: 'Arapey', sans-serif;
  color: #fff;
}

/* background */

.bg {
  position: fixed; inset: 0; z-index: 0;
  background: url('background.jpeg') center/cover no-repeat;
  background-color: #070d18;
}

.bg::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, transparent 35%, rgba(4,8,18,1) 100%);
}

/* centrepiece */

.stage {
  position: relative; z-index: 1;
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-bottom: 15vh;
}

.wheel-wrapper {
  position: relative;
  width: min(62vmin, 520px);
  height: min(62vmin, 520px);
  animation: wheel-in 1.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes wheel-in {
  from { opacity: 0; transform: scale(0.82) rotate(-6deg); }
  to { opacity: 1; transform: scale(1) rotate(0deg); }
}

.wheel {
  width: 100%; height: 100%;
  display: block;
}

/* slices */

.slice-link {
  cursor: pointer;
  outline: none;
}

.slice {
  transition:
    opacity var(--transition-slice),
    transform var(--transition-slice),
    filter var(--transition-slice);
  transform-box: view-box;
  transform-origin: 200px 200px;
}

.slice-link:hover .slice--triori,
.slice-link:focus-visible .slice--triori,
.slice-link:hover .slice--muse,
.slice-link:focus-visible .slice--muse,
.slice-link:hover .slice--zeteo,
.slice-link:focus-visible .slice--zeteo {
  transform: scale(1.045);
  filter: brightness(1.2) drop-shadow(0 0 14px rgba(255,255,255,0.15));
}

.slice-link:active .slice {
  filter: brightness(0.85);
}

.gap-line {
  stroke: rgba(4, 8, 20, 0.75);
  stroke-width: 3;
  pointer-events: none;
}

/* centre */

.hub-ring {
  fill: none;
  stroke: var(--color-hub-ring);
  stroke-width: 2.5;
  opacity: 0.7;
  animation: hub-pulse 3.2s ease-in-out infinite;
}

@keyframes hub-pulse {
  0%, 100% { opacity: 0.45; stroke-width: 2.5; }
  50%       { opacity: 0.85; stroke-width: 3.2; }
}

.hub-fill {
  fill: var(--color-hub);
  transition: filter var(--transition-slice);
}

.hub-link {
  cursor: pointer;
  outline: none;
}

.hub-link:hover .hub-fill,
.hub-link:focus-visible .hub-fill {
  filter: brightness(1.35);
}

.hub-link:active .hub-fill {
  filter: brightness(0.85);
}

.hub-icon {
  pointer-events: none;
  transform-origin: 200px 193px;
  transition: transform var(--transition-slice);
}

.hub-link:hover .hub-icon,
.hub-link:focus-visible .hub-icon {
  transform: scale(1.15);
}

.hub-label {
  font-size: 1.3rem;
  font-weight: 400;
  letter-spacing: 5px;
  fill: rgba(255,255,255,0.88);
  text-anchor: middle;
  pointer-events: none;
  transform-origin: 200px 248px;
  transition: transform var(--transition-slice);
}

.hub-link:hover .hub-label,
.hub-link:focus-visible .hub-label {
  transform: scale(1.12);
}

/* labels */
.slice-label {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  pointer-events: none;
  user-select: none;
  animation: label-in 1.3s 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes label-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.slice-icon {
  width: var(--icon-size);
  height: var(--icon-size);
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.9;
  transition: transform var(--transition-slice);
}

.slice-name {
  font-size: var(--label-font);
  font-weight: 400;
  letter-spacing: 5px;
  color: rgba(255,255,255,0.92);
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
  transition: transform var(--transition-slice);
  display: inline-block;
}

.wheel-wrapper.hovered-triori .slice-label--triori .slice-icon,
.wheel-wrapper.hovered-muse .slice-label--muse .slice-icon,
.wheel-wrapper.hovered-zeteo .slice-label--zeteo .slice-icon {
  transform: scale(1.15);
}

.wheel-wrapper.hovered-triori .slice-label--triori .slice-name,
.wheel-wrapper.hovered-muse .slice-label--muse .slice-name,
.wheel-wrapper.hovered-zeteo .slice-label--zeteo .slice-name {
  transform: scale(1.12);
}

.slice-label--triori {
  top: 28%;
  left: 13%;
}

.slice-label--muse {
  top: 28%;
  right: 13%;
}

.slice-label--zeteo {
  top: 75%;
  left: 43.5%;
  transform: translateX(-50%);
}

.stop-triori-inner { stop-color: var(--color-triori-light); }
.stop-triori-outer { stop-color: var(--color-triori); }
.stop-muse-inner { stop-color: var(--color-muse-lightish); }
.stop-muse-outer { stop-color: var(--color-muse-darkish); }
.stop-zeteo-inner { stop-color: var(--color-zeteo-light); }
.stop-zeteo-outer { stop-color: var(--color-zeteo); }

/* caption */

.caption-bar {
  position: fixed;
  top: 72vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(950px, 90vw);
  display: flex;
  align-items: center;
  z-index: 2;
  pointer-events: none;
}

.caption-left {
  width: 30%;
  text-align: right;
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: rgba(255,255,255,0.92);
  text-shadow: 0 2px 12px rgba(0,0,0,0.5);
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid rgba(255,255,255,0.7);
}

.caption-left.typing {
  animation: caret-blink 0.55s step-end 1 forwards;
}

.caption-left.idle {
  border-right-color: transparent;
}

@keyframes caret-blink {
  0%, 100% { border-right-color: rgba(255,255,255,0.7); }
  50% { border-right-color: transparent; }
}

.caption-right {
  width: 70%;
  padding-left: 2rem;
  text-align: left;
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 4px;
  color: rgba(255,255,255,0.8);
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
  transition: opacity 0.4s ease;
  opacity: 0;
  padding-top: 1.1rem;
}

/* responsive changes */

@media (max-width: 750px) {
  :root {
    --icon-size:  1.8rem;
    --label-font: 0.9rem;
  }
  .caption-bar { top: 62vh; }
  .caption-left { font-size: 2rem; width: 38%; }
  .caption-right { font-size: 1.1rem; width: 62%; }
  .slice-label { gap: 0; }
  .slice-name { font-size: 14px; }
  .slice-label--triori { top: 27%; left: 12%; }
  .slice-label--muse { top: 27%; right: 12%; }
  .slice-label--zeteo { left: 43.5%; }
}

@media (max-width: 450px) {
  .caption-bar { top: 54vh; }
  .caption-left { font-size: 1.5rem; }
  .caption-right { font-size: 0.8rem; }
  .slice-name { display: none; }
  .slice-label--triori { top: 30%; left: 15%; }
  .slice-label--muse { top: 30%; right: 15%; }
  .slice-label--zeteo { left: 45.5%; }
}