:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #273549;
  --line: rgba(148, 163, 184, 0.22);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #e11d48;
  --accent-hover: #f43f5e;
  --accent-soft: rgba(225, 29, 72, 0.14);
  --focus: #fda4af;
  --hint: #facc15;
  --sq-light: #f9d3dc;
  --sq-dark: #c73b60;
  --radius: 12px;
  --shadow: 0 14px 34px rgba(2, 6, 23, 0.5);
  --shadow-soft: 0 4px 14px rgba(2, 6, 23, 0.32);
  --speed: 200ms;
  color-scheme: dark;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Header */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.7));
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex: none;
  filter: drop-shadow(0 3px 8px rgba(225, 29, 72, 0.35));
}

.brand h1 {
  margin: 0;
  font-size: 1.3rem;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-actions {
  display: flex;
  gap: 8px;
  flex: none;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-width: 40px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--speed) ease, border-color var(--speed) ease, opacity var(--speed) ease,
    transform 150ms ease;
}

.btn:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: rgba(148, 163, 184, 0.4);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  border-color: transparent;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 16px rgba(225, 29, 72, 0.28);
}

.btn-primary:hover:not(:disabled) {
  border-color: transparent;
  background: var(--accent-hover);
}

.btn-lang {
  min-width: 46px;
  padding: 0 10px;
  letter-spacing: 0.05em;
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Layout: one column on phones, board + side panel on wide or landscape screens */

.layout {
  --frame: 6px; /* the board's border */
  /* On short screens the board keeps 40px squares and the page scrolls a little instead. */
  --board-min: calc(320px + 2 * var(--frame));
  --board-size: min(100%, 560px, max(var(--board-min), calc(100vh - 290px)));
  --board-size: min(100%, 560px, max(var(--board-min), calc(100dvh - 290px)));
  flex: 1;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 8px 16px 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "top" "board" "bottom" "panel";
  align-content: start;
  justify-items: center;
  gap: 6px;
}

.player-top {
  grid-area: top;
}

.player-bottom {
  grid-area: bottom;
}

.panel {
  grid-area: panel;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.player,
.panel {
  width: 100%;
  max-width: var(--board-size);
}

/*
 * The side panel needs 640px of width: a board of --board-min (40px squares)
 * plus the panel, gap and gutters. Short screens keep that floor and scroll.
 */
@media (min-width: 900px), (orientation: landscape) and (min-width: 640px) {
  .layout {
    --board-size: max(var(--board-min), min(calc(100vh - 150px), calc(100vw - 380px), 760px));
    --board-size: max(var(--board-min), min(calc(100dvh - 150px), calc(100vw - 380px), 760px));
    grid-template-columns: var(--board-size) minmax(250px, 320px);
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "board top"
      "board bottom"
      "board panel";
    justify-content: center;
    justify-items: stretch;
    align-items: start;
    column-gap: 24px;
    row-gap: 10px;
    padding-top: 16px;
  }

  .player,
  .panel {
    max-width: none;
  }
}

/* Short landscape screens with the side panel; narrower ones keep the one-column layout. */
@media (orientation: landscape) and (max-height: 520px) and (min-width: 640px) {
  .topbar {
    padding-top: 6px;
    padding-bottom: 6px;
  }

  .tagline {
    display: none;
  }

  .layout {
    --board-size: max(var(--board-min), min(calc(100vh - 76px), calc(100vw - 300px), 760px));
    --board-size: max(var(--board-min), min(calc(100dvh - 76px), calc(100vw - 300px), 760px));
    padding-top: 8px;
    column-gap: 16px;
  }
}

/* Board */

.board-wrap {
  grid-area: board;
  width: var(--board-size);
  aspect-ratio: 1 / 1;
  padding: var(--frame);
  border-radius: 14px;
  background: linear-gradient(145deg, #6b0f2c, #3f0418);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255, 255, 255, 0.07);
}

@media (max-width: 400px) {
  /*
   * The squares stay 40px wide down to 320px screens: the frame is 4px, and
   * below 360px first the side gutters, then the frame give way. Percentages
   * refer to the containing block rather than the viewport, so the sums stay
   * exact when a scrollbar takes up room.
   */
  .layout {
    --frame: clamp(0px, calc(50% - 160px), 4px);
    padding-left: clamp(0px, calc(50% - 164px), 16px);
    padding-right: clamp(0px, calc(50% - 164px), 16px);
  }
}

.board {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
}

.board:focus {
  outline: none;
}

.board:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 5px;
}

.square-light {
  fill: var(--sq-light);
}

.square-dark {
  fill: var(--sq-dark);
}

.coord {
  font: 700 23px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  pointer-events: none;
}

.coord-on-light {
  fill: var(--sq-dark);
}

.coord-on-dark {
  fill: var(--sq-light);
}

.layer-pieces,
.layer-routes,
.layer-marks,
.layer-cursor,
.layer-drag {
  pointer-events: none;
}

.lifted {
  opacity: 0.3;
}

.tint-last {
  fill: rgba(250, 204, 21, 0.36);
}

.tint-selected {
  fill: rgba(250, 204, 21, 0.55);
}

.tint-hover {
  fill: rgba(255, 255, 255, 0.4);
}

.route {
  fill: none;
  stroke: var(--hint);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.route-chosen {
  stroke-width: 11;
}

.route-shade {
  stroke: rgba(15, 23, 42, 0.55);
  stroke-width: 14;
}

.route-chosen.route-shade {
  stroke-width: 18;
}

.victim-veil {
  fill: rgba(15, 23, 42, 0.3);
}

.victim-chosen .victim-veil {
  fill: rgba(15, 23, 42, 0.55);
}

.victim-x {
  fill: none;
  stroke: var(--hint);
  stroke-width: 7;
  stroke-linecap: round;
}

.victim-x-shade {
  stroke: rgba(15, 23, 42, 0.75);
  stroke-width: 13;
}

.ring-must {
  fill: none;
  stroke: var(--hint);
  stroke-width: 6;
  animation: pulse 1.2s ease-in-out infinite;
}

.ring-selected {
  fill: none;
  stroke: #fff;
  stroke-width: 6;
}

.target-final {
  fill: var(--hint);
  stroke: rgba(15, 23, 42, 0.7);
  stroke-width: 4;
}

.target-step {
  fill: rgba(15, 23, 42, 0.35);
  stroke: var(--hint);
  stroke-width: 6;
}

.cursor {
  fill: none;
  stroke: #f8fafc;
  stroke-width: 6;
  stroke-dasharray: 18 10;
}

@keyframes pulse {
  50% {
    opacity: 0.3;
  }
}

/* Players */

.player {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--speed) ease, box-shadow var(--speed) ease, background-color var(--speed) ease;
}

.player.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-soft);
}

.player.is-winner {
  background: linear-gradient(90deg, var(--accent-soft), var(--surface));
}

.player-piece {
  width: 28px;
  height: 28px;
  flex: none;
  border-radius: 50%;
}

.is-white .player-piece {
  background: #f8fafc;
  box-shadow: inset 0 0 0 2px #64748b, inset 0 0 0 6px #f8fafc, inset 0 0 0 8px #cbd5e1, 0 2px 5px rgba(0, 0, 0, 0.35);
}

.is-black .player-piece {
  background: #1e293b;
  box-shadow: inset 0 0 0 2px #020617, inset 0 0 0 6px #1e293b, inset 0 0 0 8px #475569, 0 2px 5px rgba(0, 0, 0, 0.35);
}

.player-text {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  line-height: 1.2;
}

.player-name {
  font-weight: 700;
}

.player-sub {
  color: var(--muted);
  font-size: 0.8rem;
}

.player-name,
.player-sub {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.player-thinking {
  display: none;
  gap: 4px;
}

.is-thinking .player-thinking {
  display: inline-flex;
}

.player-thinking i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: blink 1s ease-in-out infinite;
}

.player-thinking i:nth-child(2) {
  animation-delay: 0.15s;
}

.player-thinking i:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes blink {
  0%,
  100% {
    opacity: 0.25;
  }

  50% {
    opacity: 1;
  }
}

.player-count {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.count-kings {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: #fbbf24;
  font-size: 0.9rem;
}

.crown-icon {
  width: 18px;
  height: 14px;
  fill: #fbbf24;
}

/* Status panel */

.status-card {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--speed) ease, background-color var(--speed) ease;
}

.status-card[data-state="capture"] {
  border-left-color: var(--hint);
}

.status-card[data-state="over"] {
  border-color: var(--accent);
  border-left-color: var(--accent);
  background: linear-gradient(135deg, var(--accent-soft), var(--surface) 70%);
}

.status-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.status-title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.move-counter {
  flex: none;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--bg);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.status-detail {
  min-height: 1.4em;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  gap: 8px;
}

.actions .btn {
  flex: 1;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.meta:empty {
  display: none;
}

@media (hover: none) {
  .kbd-help {
    display: none;
  }
}

/* Footer */

.footer {
  padding: 4px 16px 14px;
  text-align: center;
  font-size: 0.85rem;
}

.footer a {
  display: inline-block;
  padding: 10px 8px;
  line-height: 20px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--speed) ease;
}

.footer a:hover {
  color: var(--text);
  text-decoration: underline;
}

/* Dialogs */

dialog {
  width: min(100% - 32px, 480px);
  max-width: none;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}

dialog::backdrop {
  background: rgba(2, 6, 23, 0.68);
}

.dialog-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: calc(100vh - 40px);
  max-height: calc(100dvh - 40px);
  margin: 0;
  padding: 20px;
}

.dialog-body h2 {
  margin: 0;
  font-size: 1.2rem;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 8px;
  padding: 0;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.segments {
  display: flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
}

.segments label {
  position: relative;
  flex: 1;
  min-width: 0;
}

.segments input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.segments span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 4px 8px;
  border-radius: 9px;
  color: var(--muted);
  font-weight: 600;
  text-align: center;
  transition: background-color var(--speed) ease, color var(--speed) ease;
}

.segments label:hover span {
  color: var(--text);
}

.segments input:checked + span {
  background: var(--accent);
  color: #fff;
}

.segments input:focus-visible + span {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin: 0;
}

.rules {
  min-height: 0;
  overflow-y: auto;
  padding-right: 4px;
}

.rules section + section {
  margin-top: 14px;
}

.rules h3 {
  margin: 0 0 4px;
  color: var(--focus);
  font-size: 0.95rem;
}

.rules p {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 0.92rem;
}

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