* {
  box-sizing: border-box;
}

:root {
  --bg-1: #020712;
  --bg-2: #06111d;
  --bg-3: #0b2231;
  --panel: rgba(6, 18, 30, 0.74);
  --panel-border: rgba(135, 227, 255, 0.16);
  --text: #d9f4ff;
  --muted: #97c7d8;
  --hint: #79a9bb;
  --value: #9be3ff;
  --accent: #65d8ff;
  --button-2: rgba(120, 166, 188, 0.18);
  --shadow: rgba(0, 0, 0, 0.45);
  --stage-brightness: 1;
  --stage-intensity: 1;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2) 45%, var(--bg-1));
  font-family: Inter, system-ui, sans-serif;
  font-size: 0.95em;
  color: var(--text);
}

body {
  position: relative;
}

.app,
.stage {
  width: 100%;
  height: 100%;
}

.stage {
  position: relative;
  overflow: hidden;

  --stage-r1-x: 20%;
  --stage-r1-y: 10%;
  --stage-r1-r: rgba(88, 216, 255, calc(0.08 * var(--stage-intensity)));
  --stage-r1-stop: 22%;

  --stage-r2-x: 80%;
  --stage-r2-y: 22%;
  --stage-r2-r: rgba(86, 162, 255, calc(0.08 * var(--stage-intensity)));
  --stage-r2-stop: 24%;

  --stage-lin-angle: 180deg;
  --stage-lin-c1: var(--bg-3);
  --stage-lin-c2: var(--bg-2);
  --stage-lin-c2-stop: 45%;
  --stage-lin-c3: var(--bg-1);
}

.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;

  background:
    radial-gradient(
      circle at var(--stage-r1-x) var(--stage-r1-y),
      var(--stage-r1-r),
      transparent var(--stage-r1-stop)
    ),
    radial-gradient(
      circle at var(--stage-r2-x) var(--stage-r2-y),
      var(--stage-r2-r),
      transparent var(--stage-r2-stop)
    ),
    linear-gradient(
      var(--stage-lin-angle),
      var(--stage-lin-c1),
      var(--stage-lin-c2) var(--stage-lin-c2-stop),
      var(--stage-lin-c3)
    );

  filter: brightness(var(--stage-brightness));
  transition: background 0.9s ease, filter 0.35s ease;
}

.stage.ui-hidden #customCursor,
.stage.ui-hidden .overlay,
.stage.ui-hidden .menu-toggle,
.stage.ui-hidden .fps,
.stage.ui-hidden .sphere-info-label {
  opacity: 0;
  pointer-events: none;
}

#sphereCanvas {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: block;
  cursor: none;
}

#sphereCanvas.dragging-sphere,
#sphereCanvas.dragging-view {
  cursor: grabbing;
}

#customCursor {
  position: fixed;
  left: 0;
  top: 0;
  width: 128px;
  height: 128px;
  pointer-events: none;
  z-index: 19;
  transform: translate(-50%, -50%);
}

#customCursor img {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 50%;
  height: 50%;
  object-fit: contain;
  opacity: 0.92;
  filter: drop-shadow(0 0 8px rgba(101, 216, 255, 0.18));
  transform: translate(-50%, -50%);
  transform-origin: center center;
}

#customCursor.hidden {
  opacity: 0;
}

#customCursor {
  transition: opacity 0.18s ease;
}

.stage:has(#openMenuBtn:hover) #customCursor,
.stage:has(.overlay.visible:hover) #customCursor,
.stage:has(.compass:not(.hidden):hover) #customCursor,
.stage:has(.fps:not(.hidden):hover) #customCursor {
  opacity: 0;
}

/* Warp flash overlay */
#warpOverlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(
    circle at var(--wx, 50%) var(--wy, 50%),
    rgba(200, 240, 255, 0.55) 0%,
    rgba(100, 200, 255, 0.18) 18%,
    transparent 65%
  );
  transition: opacity 0.12s ease;
}

#warpOverlay.flash {
  opacity: 1;
}

/* Star hover tooltip */
#starLabel {
  position: absolute;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  color: #c8f0ff;
  font-size: 0.8rem;
  background: rgba(5, 18, 28, 0.78);
  border: 1px solid rgba(135, 227, 255, 0.22);
  border-radius: 8px;
  padding: 4px 10px;
  transform: translate(-50%, -180%);
  white-space: nowrap;
  transition: opacity 0.15s ease;
}

.sphere-info-label {
  position: absolute;
  z-index: 18;
  min-width: 220px;
  max-width: 280px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(5, 18, 28, 0.52);
  border: 1px solid rgba(135, 227, 255, 0.26);
  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(10px);
  color: var(--text);
  pointer-events: none;
  opacity: 1;
  transform: translate(-50%, -50%);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    left 0.25s ease,
    top 0.25s ease;
}

.sphere-info-label.hidden {
  opacity: 0;
}

.sphere-info-title {
  margin-bottom: 8px;
  color: #c8f0ff;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.sphere-info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 10px;
  font-size: 0.8rem;
  line-height: 1.25;
}

.sphere-info-grid .k {
  color: var(--hint);
  white-space: nowrap;
}

.sphere-info-grid .v {
  color: var(--value);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.sphere-info-label::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: rgba(5, 18, 28, 0.82);
  border-left: 1px solid rgba(135, 227, 255, 0.26);
  border-top: 1px solid rgba(135, 227, 255, 0.26);
  transform: rotate(45deg);
}

.sphere-info-label.pos-right::after {
  left: -8px;
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.sphere-info-label.pos-left::after {
  right: -8px;
  top: 50%;
  transform: translateY(-50%) rotate(135deg);
}

.sphere-info-label.pos-top::after {
  left: 50%;
  bottom: -8px;
  transform: translateX(-50%) rotate(225deg);
}

.sphere-info-label.pos-bottom::after {
  left: 50%;
  top: -8px;
  transform: translateX(-50%) rotate(45deg);
}

.sphere-info-label.pos-top-left::after {
  right: 18px;
  bottom: -8px;
  transform: rotate(225deg);
}

.sphere-info-label.pos-top-right::after {
  left: 18px;
  bottom: -8px;
  transform: rotate(225deg);
}

.sphere-info-label.pos-bottom-left::after {
  right: 18px;
  top: -8px;
  transform: rotate(45deg);
}

.sphere-info-label.pos-bottom-right::after {
  left: 18px;
  top: -8px;
  transform: rotate(45deg);
}

.overlay {
  position: absolute;
  top: 20px;
  right: 20px;
  width: min(668px, calc(100vw - 40px));
  max-height: calc(100vh - 40px);
  overflow: auto;
  padding: 18px 18px 16px;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow:
    0 16px 48px var(--shadow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(16px);
  transition:
    opacity 0.35s ease,
    transform 0.35s ease;
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.overlay:not(.visible) {
  opacity: 0;
  transform: translateX(20px);
  pointer-events: none;
}

.overlay h1 {
  margin: 0 0 12px;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.menu-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 20;

  border: 1px solid rgba(123, 226, 255, 0.18);
  border-radius: 12px;
  padding: 10px 14px;
  background: rgba(6, 18, 30, 0.78);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  backdrop-filter: blur(12px);

  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  transition:
    opacity 0.35s ease,
    transform 0.35s ease;
}

.menu-toggle.hidden {
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
}

.menu-close {
  position: absolute;
  top: 12px;
  right: 12px;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 4px 8px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1;
}

.menu-close:hover {
  background: rgba(255, 255, 255, 0.08);
}

.overlay {
  cursor: default;
  z-index: 20;
}

.menu-toggle {
  z-index: 21;
  cursor: pointer;
}

.fps,
.compass,
.sphere-info-label,
#starLabel,
#warpOverlay {
  z-index: 15;
}

.overlay button,
.overlay input[type="range"],
.overlay input[type="checkbox"],
.overlay label,
.menu-toggle,
.menu-close,
button {
  cursor: pointer;
}

.overlay input[type="number"] {
  cursor: text;
}

.desc {
  margin: 0 0 18px;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--muted);
}

.desc.two-cols {
  columns: 2;
  column-gap: 2rem;
}

.control {
  margin-bottom: 12px;
}

.control-inline {
  display: grid;
  grid-template-columns: 110px 1fr 58px;
  align-items: center;
  gap: 12px;
  height: 20px;
}

.control-inline label {
  margin: 0;
  font-size: 0.9rem;
}

.control-inline .value {
  min-width: 58px;
  text-align: right;
}

.control-inline input[type="number"] {
  width: 100%;
  min-width: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 0.92rem;
}

.value {
  color: var(--value);
  font-variant-numeric: tabular-nums;
  min-width: 72px;
  text-align: right;
}

input[type="range"],
input[type="number"] {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="number"] {
  border: 1px solid rgba(135, 227, 255, 0.14);
  background: rgba(5, 16, 27, 0.72);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}

.checkbox-row {
  margin-top: 4px;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  color: var(--text);
}

.checkbox input {
  cursor: pointer;
}

.buttons {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

#warpOverlay,
#starLabel,
.sphere-info-label,
.overlay,
.menu-toggle,
.fps,
.compass {
  position: absolute;
}

button {
  border: 1px solid rgba(123, 226, 255, 0.18);
  border-radius: 12px;
  padding: 10px 14px;
  background: linear-gradient(180deg, rgba(33, 145, 189, 0.9), rgba(20, 96, 126, 0.92));
  color: white;
  cursor: pointer;
  font-weight: 600;
}

button.secondary {
  background: var(--button-2);
  color: var(--text);
  font-size: 0.75em !important;
}

#latCount, #lonCount, #ringInnerRadius, #ringOuterRadius {
  width: 100px;
}

#pauseBtn, #resetSphereBtn, #resetBtn, #fullscreenBtn {
  width: 125px;
}

button.active {
  border-color: rgba(123, 226, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(123, 226, 255, 0.18) inset;
}

.row input[type="number"] {
  width: 72px;
  min-width: 72px;
  padding: 6px 8px;
}

.overlay hr {
  border: 0;
  height: 1px;
  margin: 14px 0 18px;
  background: linear-gradient(
    90deg,
    rgba(135, 227, 255, 0),
    rgba(135, 227, 255, 0.22) 18%,
    rgba(155, 227, 255, 0.38) 50%,
    rgba(135, 227, 255, 0.22) 82%,
    rgba(135, 227, 255, 0)
  );
  box-shadow:
    0 0 10px rgba(101, 216, 255, 0.08),
    0 1px 0 rgba(255, 255, 255, 0.03);
  opacity: 0.95;
}

.hint {
  margin-top: 14px;
  color: var(--hint);
  font-size: 0.86rem;
  line-height: 1.4;
}

.hue-preview {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  vertical-align: middle;
  margin-left: 6px;
}

.fps {
  position: absolute;
  left: 18px;
  top: 18px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(5, 18, 28, 0.68);
  border: 1px solid rgba(135, 227, 255, 0.14);
  color: var(--value);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
  backdrop-filter: blur(10px);
  transition: opacity 0.2s ease;
}

.fps.hidden {
  opacity: 0;
  pointer-events: none;
}

.compass {
  position: absolute;
  left: 18px;
  bottom: 18px;
  width: 132px;
  height: 132px;
  border-radius: 18px;
  background: rgba(5, 18, 28, 0.52);
  border: 1px solid rgba(135, 227, 255, 0.14);
  backdrop-filter: blur(10px);
  transition: opacity 0.2s ease;
}

.compass.hidden {
  opacity: 0;
  pointer-events: none;
}

#compassCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

@media (max-width: 720px) {
  .overlay {
    top: 12px;
    right: 12px;
    width: min(540px, calc(100vw - 24px));
    max-height: calc(100vh - 24px);
  }

  .fps {
    top: 12px;
    left: 12px;
  }

  .control-inline {
    grid-template-columns: 92px 1fr 72px;
    gap: 10px;
  }

  .compass {
    right: 12px;
    bottom: 12px;
    width: 116px;
    height: 116px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .menu-toggle {
    top: 12px;
    right: 12px;
  }

  .menu-close {
    top: 10px;
    right: 10px;
  }
}