:root {
  color-scheme: dark;
  --bg: #06101e;
  --panel: rgba(12, 23, 43, 0.9);
  --panel-strong: rgba(16, 31, 57, 0.96);
  --text: #edf7ff;
  --muted: #9fb6cc;
  --line: rgba(92, 170, 255, 0.28);
  --blue: #4aaeff;
  --cyan: #2ee8ff;
  --green: #74ff59;
  --amber: #ffc234;
  --purple: #cf61ff;
  --red: #ff5b3d;
  --shadow: rgba(0, 0, 0, 0.46);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 10%, rgba(74, 174, 255, 0.16), transparent 34rem),
    linear-gradient(180deg, #071226 0%, #030711 100%);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  font: inherit;
}

.game-shell {
  position: fixed;
  inset: 0;
  min-width: 0;
  background:
    linear-gradient(90deg, rgba(18, 38, 69, 0.36) 0 1px, transparent 1px 72px),
    linear-gradient(0deg, rgba(18, 38, 69, 0.26) 0 1px, transparent 1px 72px);
}

.topbar {
  position: absolute;
  top: 10px;
  left: clamp(10px, 2vw, 24px);
  right: clamp(10px, 2vw, 24px);
  z-index: 5;
  display: grid;
  grid-template-columns: minmax(160px, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  min-height: 0;
  padding: 0;
  background:
    linear-gradient(180deg, rgba(7, 16, 32, 0.08), rgba(8, 18, 36, 0.02)),
    radial-gradient(circle at 50% 100%, rgba(74, 174, 255, 0.14), transparent 44%);
  border-bottom: 0;
  box-shadow: none;
  pointer-events: none;
}

.brand-block {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 9px;
  pointer-events: none;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.72);
}

.brand-block strong {
  display: block;
  font-size: clamp(0.88rem, 1.45vw, 1.08rem);
  line-height: 1.05;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-block span:not(.brand-node) {
  display: block;
  max-width: min(46vw, 520px);
  overflow: hidden;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-node {
  position: relative;
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background:
    radial-gradient(circle, #e8fcff 0 20%, var(--cyan) 21% 46%, #0b315f 48% 100%);
  border: 1px solid rgba(131, 221, 255, 0.7);
  box-shadow: 0 0 22px rgba(46, 232, 255, 0.56);
}

.brand-node::before,
.brand-node::after {
  position: absolute;
  top: 14px;
  width: 24px;
  height: 4px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 12px rgba(46, 232, 255, 0.9);
}

.brand-node::before {
  right: 27px;
}

.brand-node::after {
  left: 27px;
}

.readouts {
  display: grid;
  grid-template-columns: repeat(4, minmax(54px, 1fr));
  gap: 6px;
  margin: 0;
}

.readouts div {
  min-width: 0;
  padding: 6px 8px;
  border: 1px solid rgba(89, 160, 255, 0.22);
  border-radius: 8px;
  background: rgba(8, 18, 38, 0.68);
  box-shadow:
    0 10px 20px rgba(0, 0, 0, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(6px);
}

.readouts dt {
  color: #7d96ae;
  font-size: 0.56rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1;
  margin: 0 0 5px;
  text-transform: uppercase;
}

.readouts dd {
  color: var(--text);
  font-family: "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.84rem;
  font-weight: 900;
  line-height: 1;
  margin: 0;
}

.shell-controls {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  pointer-events: auto;
}

.icon-button {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: #caeeff;
  border: 1px solid rgba(90, 169, 255, 0.32);
  border-radius: 8px;
  background: rgba(14, 29, 56, 0.86);
  cursor: pointer;
  transition:
    border-color 120ms ease,
    background 120ms ease,
    transform 120ms ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  background: rgba(24, 55, 99, 0.96);
  border-color: rgba(113, 210, 255, 0.72);
  outline: none;
  transform: translateY(-1px);
}

.icon-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.2;
}

.icon-button .mute-slash {
  opacity: 0;
}

.icon-button[aria-pressed="true"] .sound-wave {
  opacity: 0;
}

.icon-button[aria-pressed="true"] .mute-slash {
  opacity: 1;
}

.board-shell {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.hint-panel {
  position: absolute;
  top: 86px;
  left: 50%;
  z-index: 4;
  width: min(520px, calc(100% - 32px));
  min-height: 34px;
  transform: translateX(-50%);
  padding: 7px 14px;
  color: #d8f4ff;
  font-size: 0.76rem;
  font-weight: 750;
  line-height: 1.25;
  text-align: center;
  text-shadow: 0 1px 0 #06101e;
  border: 1px solid rgba(74, 174, 255, 0.35);
  border-radius: 8px;
  background: rgba(5, 16, 34, 0.64);
  box-shadow:
    0 16px 34px rgba(0, 0, 0, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

.hint-panel.active {
  border-color: rgba(207, 97, 255, 0.72);
  box-shadow:
    0 0 20px rgba(207, 97, 255, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.commandbar {
  position: absolute;
  right: 0;
  bottom: 10px;
  left: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 0;
  padding: 0 clamp(12px, 2vw, 24px);
  background: transparent;
  border-top: 0;
  box-shadow: none;
  pointer-events: none;
}

.mode-group,
.action-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  pointer-events: auto;
}

.tool-button,
.primary-button,
.secondary-button {
  min-height: 36px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    background 120ms ease,
    color 120ms ease,
    filter 120ms ease;
}

.tool-button {
  min-width: 74px;
  padding: 0 12px;
  color: #c9e5f8;
  border: 1px solid rgba(90, 169, 255, 0.32);
  background: rgba(12, 26, 51, 0.76);
  font-size: 0.68rem;
  backdrop-filter: blur(7px);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.28);
}

.tool-button:hover,
.tool-button:focus-visible {
  border-color: rgba(113, 210, 255, 0.72);
  background: rgba(24, 55, 99, 0.98);
  outline: none;
  transform: translateY(-1px);
}

.tool-button.active {
  color: #06101e;
  border-color: rgba(120, 236, 255, 0.9);
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  box-shadow: 0 0 18px rgba(46, 232, 255, 0.26);
}

.state-overlay {
  position: absolute;
  inset: 0;
  z-index: 8;
  display: grid;
  place-items: center;
  padding: 22px;
  background:
    radial-gradient(circle at 50% 50%, rgba(74, 174, 255, 0.16), transparent 30rem),
    rgba(3, 8, 18, 0.84);
  backdrop-filter: blur(5px);
}

.state-overlay[hidden] {
  display: none;
}

.state-panel {
  width: min(520px, 100%);
  padding: clamp(22px, 4vw, 34px);
  text-align: center;
  border: 1px solid rgba(91, 181, 255, 0.34);
  border-radius: 10px;
  background:
    linear-gradient(180deg, rgba(14, 29, 55, 0.96), rgba(7, 16, 32, 0.97)),
    radial-gradient(circle at 50% 0%, rgba(46, 232, 255, 0.14), transparent 58%);
  box-shadow:
    0 34px 80px rgba(0, 0, 0, 0.52),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.panel-kicker {
  display: block;
  color: var(--cyan);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.state-panel h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(2rem, 6vw, 3.8rem);
  line-height: 0.94;
  text-transform: uppercase;
}

.state-panel p {
  margin: 16px auto 0;
  max-width: 420px;
  color: #bcd3e7;
  font-size: 1rem;
  line-height: 1.55;
}

.state-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 20px 0 0;
}

.state-stats span {
  display: block;
  padding: 10px 8px;
  color: #dff7ff;
  border: 1px solid rgba(91, 181, 255, 0.23);
  border-radius: 8px;
  background: rgba(7, 16, 32, 0.76);
  font-family: "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.85rem;
  font-weight: 900;
}

.panel-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}

.primary-button,
.secondary-button {
  padding: 0 22px;
  font-size: 0.82rem;
}

.primary-button {
  color: #03101c;
  border: 1px solid rgba(120, 236, 255, 0.72);
  background: linear-gradient(135deg, var(--cyan), var(--green));
  box-shadow: 0 0 24px rgba(46, 232, 255, 0.28);
}

.secondary-button {
  color: #d8f0ff;
  border: 1px solid rgba(90, 169, 255, 0.32);
  background: rgba(10, 24, 48, 0.88);
}

.primary-button:hover,
.primary-button:focus-visible,
.secondary-button:hover,
.secondary-button:focus-visible {
  filter: brightness(1.08);
  outline: none;
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  .topbar {
    grid-template-columns: 1fr auto;
    gap: 10px;
  }

  .readouts {
    order: 3;
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    width: 100%;
  }

  .readouts div {
    padding: 7px 8px;
  }

  .readouts dt {
    font-size: 0.58rem;
  }

  .readouts dd {
    font-size: 0.9rem;
  }
}

@media (max-width: 620px) {
  .topbar {
    top: 9px;
    left: 10px;
    right: 10px;
    padding: 0;
  }

  .brand-node {
    width: 30px;
    height: 30px;
  }

  .brand-node::before,
  .brand-node::after {
    top: 13px;
    width: 18px;
  }

  .brand-node::before {
    right: 25px;
  }

  .brand-node::after {
    left: 25px;
  }

  .shell-controls {
    gap: 6px;
  }

  .icon-button {
    width: 38px;
    height: 38px;
  }

  .hint-panel {
    top: 118px;
    min-height: 36px;
    padding: 8px 12px;
    font-size: 0.76rem;
  }

  .commandbar {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
    bottom: 10px;
    padding: 0 10px;
  }

  .mode-group,
  .action-group {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .mode-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-button {
    min-width: 0;
    min-height: 38px;
    padding: 0 8px;
    font-size: 0.68rem;
  }

  .state-stats {
    grid-template-columns: 1fr;
  }

  .panel-actions {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}