:root {
  --ui-text: #eaf6f9;
  --ui-muted: #b7d5da;
  --ui-bg: rgba(8, 21, 28, 0.68);
  --ui-bg-strong: rgba(6, 17, 24, 0.92);
  --ui-border: rgba(145, 204, 212, 0.42);
  --ui-accent: #83d1db;
  --ui-accent-strong: #f2bb74;
  --shadow: 0 14px 40px rgba(2, 8, 12, 0.45);
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 20%, rgba(35, 94, 119, 0.35), transparent 45%),
    radial-gradient(circle at 84% 78%, rgba(173, 122, 62, 0.2), transparent 42%),
    linear-gradient(165deg, #061019 0%, #0a1822 60%, #0f1d27 100%);
  color: var(--ui-text);
  font-family: "Trebuchet MS", "Gill Sans", "Segoe UI", sans-serif;
}

#glCanvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

.movement-hint {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 12;
  display: grid;
  justify-items: center;
  gap: 12px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  user-select: none;
  opacity: 1;
  transition: opacity 480ms ease, transform 480ms ease, filter 480ms ease;
}

.movement-hint[hidden],
.help-pointer-hint[hidden] {
  display: none !important;
}

.movement-hint--fading {
  opacity: 0;
  transform: translate(-50%, -44%);
  filter: blur(2px);
}

.help-pointer-hint {
  position: fixed;
  top: 20px;
  right: 120px;
  z-index: 19;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid rgba(160, 213, 220, 0.52);
  border-radius: 999px;
  background: rgba(9, 26, 36, 0.64);
  color: rgba(240, 250, 252, 0.94);
  pointer-events: none;
  user-select: none;
  box-shadow: 0 10px 24px rgba(2, 8, 12, 0.35);
  backdrop-filter: blur(5px);
  transition: opacity 480ms ease, transform 480ms ease, filter 480ms ease;
}

.help-pointer-hint.movement-hint--fading {
  opacity: 0;
  transform: translateX(8px);
  filter: blur(2px);
}

.help-pointer-text {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.help-pointer-arrow {
  font-size: 16px;
  line-height: 1;
  color: var(--ui-accent-strong);
}

.movement-hint-title {
  margin: 0;
  padding: 8px 14px;
  border: 1px solid rgba(160, 213, 220, 0.5);
  border-radius: 999px;
  background: rgba(9, 26, 36, 0.6);
  color: rgba(240, 250, 252, 0.95);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  backdrop-filter: blur(5px);
  box-shadow: 0 8px 24px rgba(3, 12, 18, 0.35);
}

.movement-keys {
  display: grid;
  grid-template-columns: repeat(3, 44px);
  grid-template-rows: repeat(2, 44px);
  gap: 8px;
  grid-template-areas:
    ". w ."
    "a s d";
}

.movement-key {
  display: grid;
  place-items: center;
  border: 1px solid rgba(149, 208, 215, 0.55);
  border-radius: 10px;
  background: linear-gradient(160deg, rgba(14, 37, 49, 0.72), rgba(8, 22, 29, 0.62));
  color: rgba(241, 251, 255, 0.95);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  box-shadow: inset 0 -4px 10px rgba(0, 0, 0, 0.3), 0 8px 18px rgba(2, 8, 12, 0.35);
}

.movement-key-w {
  grid-area: w;
}

.movement-key-a {
  grid-area: a;
}

.movement-key-s {
  grid-area: s;
}

.movement-key-d {
  grid-area: d;
}

.overlay-button {
  z-index: 20;
  border: 1px solid var(--ui-border);
  border-radius: 999px;
  padding: 10px 15px;
  background: linear-gradient(120deg, rgba(8, 25, 35, 0.88), rgba(15, 38, 51, 0.8));
  color: var(--ui-text);
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: var(--shadow);
  backdrop-filter: blur(5px);
  transition: transform 140ms ease, border-color 140ms ease, color 140ms ease;
}

.overlay-controls {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 20;
  display: grid;
  gap: 10px;
  justify-items: end;
}

.overlay-button:hover {
  transform: translateY(-1px);
  border-color: var(--ui-accent);
  color: #f5fdff;
}

.overlay-button:focus-visible,
.close-button:focus-visible {
  outline: 2px solid var(--ui-accent-strong);
  outline-offset: 2px;
}

.help-dialog {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: start end;
  padding: 70px 20px 20px;
  background: rgba(5, 11, 15, 0.45);
}

.help-dialog[hidden] {
  display: none;
}

.help-card {
  width: min(440px, calc(100vw - 40px));
  border: 1px solid var(--ui-border);
  border-radius: var(--radius);
  padding: 14px 16px 12px;
  background: linear-gradient(170deg, rgba(8, 22, 30, 0.95), rgba(11, 30, 40, 0.94));
  box-shadow: var(--shadow);
}

.help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.help-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.help-card p {
  margin: 10px 0 8px;
  color: var(--ui-muted);
  font-size: 14px;
  line-height: 1.4;
}

.settings-card {
  display: grid;
  gap: 12px;
}

.setting-row {
  display: grid;
  gap: 7px;
}

.setting-inline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
}

.setting-row span {
  color: var(--ui-muted);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.setting-row input,
.setting-row select {
  width: 100%;
  border: 1px solid var(--ui-border);
  border-radius: 8px;
  padding: 8px 10px;
  background: rgba(8, 24, 33, 0.92);
  color: var(--ui-text);
  font: inherit;
}

.setting-row input[type="range"] {
  padding: 0;
  accent-color: var(--ui-accent-strong);
}

.setting-value {
  min-width: 82px;
  text-align: right;
  border: 1px solid var(--ui-border);
  border-radius: 8px;
  padding: 6px 8px;
  background: rgba(8, 24, 33, 0.92);
  color: var(--ui-text);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.setting-row input:focus-visible,
.setting-row select:focus-visible {
  outline: 2px solid var(--ui-accent-strong);
  outline-offset: 1px;
}

.settings-note {
  margin: 0;
  color: var(--ui-muted);
  font-size: 13px;
  line-height: 1.35;
}

.help-card ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 7px;
  font-size: 14px;
  line-height: 1.35;
}

.close-button {
  border: 1px solid var(--ui-border);
  border-radius: 999px;
  padding: 7px 12px;
  background: rgba(9, 25, 34, 0.95);
  color: var(--ui-text);
  cursor: pointer;
  transition: border-color 120ms ease, color 120ms ease;
}

.close-button:hover {
  border-color: var(--ui-accent);
  color: #f8feff;
}

.signature {
  position: fixed;
  left: 16px;
  bottom: 12px;
  z-index: 15;
  color: rgba(244, 251, 255, 0.84);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  pointer-events: none;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
}

.error-banner {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  max-width: calc(100vw - 30px);
  border: 1px solid rgba(255, 137, 114, 0.8);
  border-radius: 10px;
  padding: 8px 12px;
  background: rgba(53, 18, 12, 0.92);
  color: #ffd6cd;
  font-size: 13px;
  line-height: 1.3;
}

@media (max-width: 560px) {
  .movement-hint {
    gap: 10px;
  }

  .movement-hint-title {
    font-size: 12px;
    letter-spacing: 0.06em;
    padding: 7px 12px;
  }

  .movement-keys {
    grid-template-columns: repeat(3, 38px);
    grid-template-rows: repeat(2, 38px);
    gap: 7px;
  }

  .movement-key {
    border-radius: 8px;
    font-size: 14px;
  }

  .help-pointer-hint {
    top: 13px;
    right: 95px;
    gap: 6px;
    padding: 6px 9px;
  }

  .help-pointer-text {
    font-size: 11px;
  }

  .help-pointer-arrow {
    font-size: 14px;
  }

  .overlay-controls {
    top: 12px;
    right: 12px;
    gap: 8px;
  }

  .overlay-button {
    padding: 9px 13px;
  }

  .help-dialog {
    padding: 58px 12px 12px;
  }

  .help-card {
    width: calc(100vw - 24px);
  }

  .signature {
    left: 12px;
    bottom: 10px;
    letter-spacing: 0.12em;
    font-size: 12px;
  }
}