:root {
  /* Space Grotesk" (Google Fonts Interaction Design Design: Design* Design:* Design:: Design:** aligns perfectly with the submarine-instrument aesthetic while its warmth prevents the coldness of purely geometric typefaces. */
  --deep-ground: #1a2332;
  --mid-water: #5b9e8f;
  --shallow-water: #8ec5b5;
  --candle-amber: #d4a24e;
  --sand-neutral: #c4b9a0;
  --kelp-dark: #2d4a3e;
  --phosphor-green: #3d7a6e;
  --driftwood: #6b5b4a;
  --metal-dim: #8a8a8a;
  --metal-bright: #c0c0c0;
  --flame-tip: #e8d5a0;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  overflow: hidden;
  background: var(--deep-ground);
}

body {
  position: fixed;
  inset: 0;
  font-family: "Space Grotesk", Inter, sans-serif;
  color: var(--sand-neutral);
  cursor: crosshair;
}

#tidal-field {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background:
    radial-gradient(circle at 48% 54%, rgba(91, 158, 143, 0.13), transparent 33vw),
    linear-gradient(145deg, var(--deep-ground) 0%, #2d4a3e 58%, var(--deep-ground) 100%);
}

.vessel-glass,
.pressure-vignette {
  position: fixed;
  pointer-events: none;
  inset: 0;
}

.vessel-glass {
  z-index: 1;
  opacity: 0.38;
  background:
    linear-gradient(118deg, transparent 0 19%, rgba(142, 197, 181, 0.055) 19.3%, transparent 19.7% 53%, rgba(196, 185, 160, 0.035) 53.3%, transparent 53.6%),
    repeating-linear-gradient(92deg, rgba(192, 192, 192, 0.018) 0 1px, transparent 1px 83px),
    radial-gradient(ellipse at center, transparent 0 46%, rgba(26, 35, 50, 0.56) 77%, rgba(26, 35, 50, 0.84) 100%);
  mix-blend-mode: screen;
}

.pressure-vignette {
  z-index: 4;
  box-shadow: inset 0 0 18vw 6vw rgba(26, 35, 50, 0.9), inset 0 0 0 1px rgba(91, 158, 143, 0.18);
}

.hud-panel {
  position: fixed;
  z-index: 5;
  transition: opacity 800ms ease, filter 800ms ease, transform 800ms ease;
}

body.panel-hover .hud-panel:not(.is-hovered) {
  opacity: 0.6;
  filter: saturate(0.75) brightness(0.82);
}

.hud-gauge {
  top: clamp(18px, 4.3vh, 48px);
  left: clamp(18px, 3.6vw, 54px);
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: conic-gradient(from 18deg, var(--metal-dim), var(--metal-bright), var(--driftwood), var(--metal-bright), var(--metal-dim), var(--metal-bright), var(--metal-dim));
  box-shadow: 0 0 0 1px rgba(192, 192, 192, 0.22), 0 18px 45px rgba(26, 35, 50, 0.65), inset 0 0 22px rgba(26, 35, 50, 0.55);
  padding: 12px;
}

.gauge-inner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 55%, rgba(91, 158, 143, 0.14) 0 9%, transparent 10%),
    repeating-conic-gradient(from -2deg, rgba(91, 158, 143, 0.95) 0 1.8deg, transparent 1.8deg 15deg),
    radial-gradient(circle at center, var(--deep-ground) 0 57%, transparent 58% 100%),
    var(--deep-ground);
  box-shadow: inset 0 0 24px rgba(61, 122, 110, 0.34), inset 0 0 0 1px rgba(91, 158, 143, 0.28);
}

.gauge-inner::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 50%;
  border: 1px solid rgba(91, 158, 143, 0.28);
  background: repeating-conic-gradient(from 0deg, transparent 0 28deg, rgba(142, 197, 181, 0.32) 28deg 29deg, transparent 29deg 30deg);
}

.gauge-label,
.gauge-value {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--sand-neutral);
  text-shadow: 0 0 4px var(--phosphor-green), 0 0 12px var(--phosphor-green);
}

.gauge-label {
  top: 36px;
  font-size: 0.56rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  line-height: 1.2;
}

.gauge-value {
  bottom: 29px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.64rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--shallow-water);
}

.gauge-needle {
  position: absolute;
  left: calc(50% - 1px);
  top: 18px;
  width: 2px;
  height: 54px;
  background: linear-gradient(to top, var(--candle-amber), var(--flame-tip));
  transform-origin: 50% 52px;
  animation: needleSweep 120s cubic-bezier(0.37, 0.02, 0.39, 0.99) infinite;
  box-shadow: 0 0 8px rgba(212, 162, 78, 0.72);
}

.gauge-pivot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: var(--candle-amber);
  box-shadow: 0 0 12px var(--candle-amber), inset 0 0 0 3px var(--driftwood);
}

@keyframes needleSweep {
  0% { transform: rotate(-126deg); }
  24% { transform: rotate(-21deg); }
  49% { transform: rotate(97deg); }
  73% { transform: rotate(203deg); }
  100% { transform: rotate(234deg); }
}

.hud-title {
  top: clamp(20px, 4.1vh, 52px);
  right: clamp(18px, 3.4vw, 52px);
  min-height: 44vh;
  padding: 4px 0;
}

.vertical-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.22em;
  font-size: clamp(0.74rem, 1.22vw, 1rem);
  font-weight: 500;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--sand-neutral);
}

.vertical-title span {
  opacity: 0;
  animation: titleBreath 9s ease-in-out infinite;
  text-shadow: 0 0 5px rgba(196, 185, 160, 0.35);
  transition: color 700ms ease, text-shadow 700ms ease;
}

.hud-title:hover .vertical-title span {
  color: var(--candle-amber);
  text-shadow: 0 0 6px var(--candle-amber), 0 0 18px rgba(212, 162, 78, 0.48);
}

@keyframes titleBreath {
  0%, 100% { opacity: 0.43; }
  42%, 58% { opacity: 0.92; }
}

.hud-readout {
  left: clamp(18px, 3.6vw, 54px);
  bottom: clamp(20px, 5vh, 56px);
  width: min(360px, 72vw);
  min-height: 138px;
  padding: 18px 20px 17px;
  border: 1px solid var(--phosphor-green);
  background: rgba(26, 35, 50, 0.85);
  box-shadow: 0 0 20px rgba(61, 122, 110, 0.26), inset 0 0 35px rgba(45, 74, 62, 0.42);
  overflow: hidden;
}

.hud-readout::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background: repeating-linear-gradient(to bottom, transparent 0 1px, rgba(26, 35, 50, 0.42) 1px 2px);
  animation: scanRoll 0.1s linear infinite;
}

.hud-readout::after {
  content: "";
  position: absolute;
  inset: -40% -20%;
  background: linear-gradient(90deg, transparent, rgba(142, 197, 181, 0.045), transparent);
  transform: translateX(-45%);
  animation: crtSweep 16s ease-in-out infinite;
}

@keyframes scanRoll {
  to { background-position: 0 2px; }
}

@keyframes crtSweep {
  0%, 72%, 100% { transform: translateX(-48%); opacity: 0; }
  82% { transform: translateX(55%); opacity: 1; }
}

.readout-label {
  position: relative;
  z-index: 1;
  margin-bottom: 12px;
  font-size: clamp(0.65rem, 1.2vw, 0.9rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sand-neutral);
}

.readout-lines {
  position: relative;
  z-index: 1;
  font-family: "IBM Plex Mono", monospace;
  font-size: clamp(0.55rem, 0.9vw, 0.75rem);
  font-weight: 300;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--shallow-water);
  text-shadow: 0 0 4px var(--mid-water), 0 0 12px var(--phosphor-green);
}

.readout-line {
  transition: opacity 600ms ease-out, transform 600ms ease-out;
  white-space: nowrap;
}

.readout-lines.updating .readout-line {
  opacity: 0;
  transform: translateY(-13px);
}

.readout-lines.entering .readout-line {
  animation: readoutEnter 300ms ease-in both;
}

@keyframes readoutEnter {
  from { opacity: 0; transform: translateY(13px); }
  to { opacity: 1; transform: translateY(0); }
}

.hud-candles {
  right: clamp(20px, 4.3vw, 64px);
  bottom: clamp(18px, 4.8vh, 58px);
  width: 190px;
  height: 142px;
}

.candle-glow {
  position: absolute;
  right: -18px;
  bottom: -34px;
  width: 230px;
  height: 150px;
  background: radial-gradient(ellipse at 62% 45%, rgba(212, 162, 78, 0.28) 0, rgba(212, 162, 78, 0.13) 33%, transparent 72%);
  filter: blur(4px);
  animation: emberPool 8s ease-in-out infinite;
}

@keyframes emberPool {
  0%, 100% { opacity: 0.56; transform: scale(0.98); }
  50% { opacity: 0.78; transform: scale(1.04); }
}

.flame {
  position: absolute;
  bottom: 26px;
  width: 54px;
  height: 86px;
  filter: drop-shadow(0 0 9px rgba(212, 162, 78, 0.58));
  transform-origin: 50% 100%;
}

.flame-a {
  right: 106px;
  transform: scale(0.76);
  animation: flameLeanA 2.3s ease-in-out infinite;
}

.flame-b {
  right: 62px;
  transform: scale(1.05);
  animation: flameLeanB 2.7s ease-in-out infinite;
}

.flame-c {
  right: 18px;
  transform: scale(0.86);
  animation: flameLeanC 3.1s ease-in-out infinite;
}

@keyframes flameLeanA {
  0%, 100% { transform: scale(0.76) rotate(-2deg); opacity: 0.88; }
  50% { transform: scale(0.82) rotate(4deg); opacity: 1; }
}

@keyframes flameLeanB {
  0%, 100% { transform: scale(1.05) rotate(3deg); opacity: 0.94; }
  50% { transform: scale(0.98) rotate(-4deg); opacity: 1; }
}

@keyframes flameLeanC {
  0%, 100% { transform: scale(0.86) rotate(2deg); opacity: 0.86; }
  50% { transform: scale(0.91) rotate(-5deg); opacity: 1; }
}

.hud-candles::after {
  content: "";
  position: absolute;
  right: 15px;
  bottom: 23px;
  width: 150px;
  height: 5px;
  border-radius: 50%;
  background: rgba(107, 91, 74, 0.78);
  box-shadow: 0 0 16px rgba(212, 162, 78, 0.2);
}

.ghost-text {
  position: fixed;
  z-index: 2;
  margin: 0;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  font-style: italic;
  color: var(--sand-neutral);
  opacity: 0.07;
  letter-spacing: 0.04em;
  pointer-events: none;
  white-space: nowrap;
  text-shadow: 0 0 22px rgba(142, 197, 181, 0.18);
}

.ghost-one {
  left: 24vw;
  top: 27vh;
  transform: rotate(-5deg);
}

.ghost-two {
  right: 18vw;
  top: 61vh;
  transform: rotate(3deg);
}

.ghost-three {
  left: 50vw;
  top: 48vh;
  transform: translate(-50%, -50%);
  font-size: clamp(4rem, 13vw, 10rem);
  opacity: 0.045;
}

@media (max-width: 720px) {
  .hud-gauge {
    width: 132px;
    height: 132px;
  }

  .hud-readout {
    width: min(324px, calc(100vw - 36px));
  }

  .hud-candles {
    width: 150px;
    transform: scale(0.82);
    transform-origin: bottom right;
  }

  .ghost-one,
  .ghost-two {
    display: none;
  }
}