/* accent colors, set from main.js (updateTones) */
:root {
  --tone-a: #e0b35a;
  --tone-b: #c93a8f;
  --tone-c: #3057d6;
  --tones: linear-gradient(90deg, var(--tone-a), var(--tone-b), var(--tone-c));
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background-color: black;
  color: rgba(255, 255, 255, 0.82);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

canvas {
  display: block;
}

#container-p5 {
  position: absolute;
  left: 30px;
  top: 30px;
}

#container-three {
  position: fixed;
  inset: 0;
  cursor: none; /* custom pointer: #cursor and #dot */
}

.title {
  position: fixed;
  top: 44px;
  left: 52px;
  pointer-events: none;
}

h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.24em;
}

.panel {
  position: fixed;
  left: 52px;
  right: 52px;
  bottom: 28px;
  display: grid;
  grid-template-columns: 1fr 340px 1fr;
  gap: 36px;
  align-items: center;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  pointer-events: none;
}

.hint p {
  margin: 0;
  font: italic 1.0625rem/1.5 Georgia, "Times New Roman", serif;
  color: rgba(255, 255, 255, 0.7);
}

.caption {
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

#phases span {
  margin-right: 18px;
  opacity: 0.32;
  transition: opacity 0.6s;
}

#phases span.active {
  opacity: 1;
}

#number {
  color: rgba(255, 255, 255, 0.5);
  font-variant-numeric: tabular-nums;
}

.track {
  height: 1px;
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.16);
}

#progress {
  display: block;
  height: 2px;
  margin-top: -0.5px;
  background: var(--tones);
  clip-path: inset(0 100% 0 0);
}

.controls {
  display: flex;
  justify-content: flex-end;
  gap: 30px;
  pointer-events: auto;
}

/* buttons of the bottom panel only (the GUI has buttons of its own): a line appears under the button on hover */
.controls button {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 2px;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
  font: inherit;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.3s;
}

.controls button::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  bottom: 7px;
  height: 1px;
  background: var(--tones);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.controls button:hover,
.controls button.active {
  color: #fff;
}

.controls button:hover::after {
  transform: scaleX(1);
}

.controls button:focus-visible {
  outline: 1px solid rgba(255, 255, 255, 0.5);
  outline-offset: 4px;
}

.key {
  color: rgba(255, 255, 255, 0.32);
}

.icon {
  width: 18px;
  height: 18px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
  stroke-linecap: square;
}

/* New: the spiral icon is redrawn on hover, and loops while melting */
.spiral path {
  stroke-dasharray: 70;
}

.controls button:hover .spiral path {
  animation: draw 0.9s cubic-bezier(0.3, 0.6, 0.2, 1);
}

.melting .spiral path {
  animation: draw 1.6s ease-in-out infinite alternate;
}

.melting #regenerate {
  color: var(--tone-a);
}

@keyframes draw {
  from {
    stroke-dashoffset: 70;
  }
  to {
    stroke-dashoffset: 0;
  }
}

/* Pause: bars, or a triangle while paused */
.bars,
.play {
  transition: opacity 0.3s;
}

.play {
  fill: currentColor;
  stroke: none;
  opacity: 0;
}

.paused .bars {
  opacity: 0;
}

.paused .play {
  opacity: 1;
}

.paused #pause {
  color: var(--tone-a);
}

/* Controls: knobs move on hover, colored while the GUI is open */
.knob {
  fill: #17181c;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), fill 0.3s;
}

.controls button:hover .knob:nth-of-type(1) {
  transform: translateX(5px);
}

.controls button:hover .knob:nth-of-type(2) {
  transform: translateX(-6px);
}

.controls button:hover .knob:nth-of-type(3) {
  transform: translateX(4px);
}

#gui.active .knob {
  fill: var(--tone-a);
  stroke: var(--tone-a);
}

/* custom pointer: a small square at the pointer and a frame that follows it.
   the frame has the size of the heated area, its outline shows the film added */
#cursor,
#dot {
  position: fixed;
  left: 0;
  top: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
  will-change: transform;
}

#cursor.on,
#dot.on {
  opacity: 1;
}

#cursor {
  width: 100px;
  height: 100px;
  margin: -50px 0 0 -50px;
}

#cursor svg {
  width: 100%;
  height: 100%;
  overflow: visible;
  filter: drop-shadow(0 0 1.5px rgba(0, 0, 0, 0.7)); /* dark edge for contrast */
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), opacity 0.4s;
}

#cursor.drag svg {
  transform: scale(0.22);
  opacity: 0.7;
}

.rim {
  stroke: rgba(255, 255, 255, 0.16);
  stroke-width: 0.75;
}

/* corner brackets: slightly smaller while heating */
.ticks {
  fill: none;
  stroke: rgba(255, 255, 255, 0.7);
  stroke-width: 1;
  stroke-linecap: square;
  transform-origin: 50px 50px;
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1);
}

#cursor.hot .ticks {
  transform: scale(0.93);
}

#arc {
  fill: none;
  stroke: url(#tones);
  stroke-width: 1.5;
  stroke-linecap: butt;
  stroke-linejoin: miter;
  stroke-dasharray: 0 100;
  transition: stroke-dasharray 0.25s linear;
}

#reading {
  position: absolute;
  left: 50%;
  top: 100%;
  margin-top: 10px;
  transform: translateX(-50%);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 0 5px rgba(0, 0, 0, 0.9), 0 0 2px rgba(0, 0, 0, 0.9); /* readable over bright bars */
  transition: opacity 0.4s;
}

#cursor.drag #reading {
  opacity: 0;
}

#dot {
  width: 4px;
  height: 4px;
  margin: -2px 0 0 -2px;
  background: #fff;
  mix-blend-mode: difference;
}

.bare #cursor,
.bare #dot {
  display: none;
}

/* H: hide the interface */
.bare .title,
.bare .panel {
  display: none;
}

/* GUI: below the title, above the panel, scrolls if too tall.
   closed = moved to the right and faded out */
.tp-dfwv {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(36px);
  transition: opacity 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), visibility 0s linear 0.5s;
  top: 40px !important;
  right: 52px !important;
  width: 292px !important;
  max-height: calc(100vh - 170px);
  overflow-y: auto;
}

/* small windows (e.g. an embed): no hint text, smaller title, one row */
.gui-open:not(.bare) .tp-dfwv {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
  transition-delay: 0s;
}

@media (max-width: 1000px), (max-height: 620px) {
  .title {
    top: 24px;
    left: 28px;
  }

  h1 {
    font-size: 1.25rem;
  }

  .panel {
    left: 28px;
    right: 28px;
    bottom: 10px;
    grid-template-columns: minmax(0, 340px) 1fr;
    gap: 24px;
    padding-top: 12px;
  }

  .hint,
  .key {
    display: none;
  }

  .controls {
    gap: 20px;
  }

  .tp-dfwv {
    top: 16px !important;
    right: 16px !important;
    max-height: calc(100vh - 90px);
  }
}

@media (max-width: 760px) {
  .title {
    top: 30px;
    left: 24px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .panel {
    left: 24px;
    right: 24px;
    bottom: 18px;
    grid-template-columns: 1fr;
    gap: 14px;
    padding-top: 16px;
  }

  .hint {
    display: none;
  }

  .controls {
    justify-content: space-between;
  }

  .tp-dfwv {
    top: 84px !important;
    right: 24px !important;
    max-height: calc(100vh - 260px);
  }
}

/* very low windows: only the title and the phases */
@media (max-height: 340px) {
  .controls {
    display: none;
  }

  .panel {
    grid-template-columns: 1fr;
    border-top: 0;
    padding-top: 0;
  }
}