:root {
  --bg: #06070b;
  --bg-2: #0c0e16;
  --panel: rgba(20, 23, 34, 0.72);
  --panel-solid: #12151f;
  --border: rgba(255, 255, 255, 0.07);
  --text: #e6e9f5;
  --muted: #7d859e;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --danger: #f43f5e;
  --sq-light: #5d6689;
  --sq-dark: #363d55;
  --piece-white: #f8faff;
  --piece-black: #05070d;
  --radius: 16px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  /* 66px — отступы доски и поля страницы */
  --board: min(78vmin, 620px, calc(100vw - 66px));
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(1100px 700px at 12% -10%, rgba(139, 92, 246, 0.16), transparent 60%),
    radial-gradient(900px 600px at 95% 10%, rgba(34, 211, 238, 0.12), transparent 55%),
    radial-gradient(800px 800px at 50% 120%, rgba(139, 92, 246, 0.08), transparent 60%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  background-attachment: fixed;
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Шапка ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px clamp(16px, 4vw, 44px) 6px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand .logo {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-size: 26px;
  border-radius: 14px;
  background: linear-gradient(140deg, rgba(139, 92, 246, 0.9), rgba(34, 211, 238, 0.65));
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.45);
  color: #0b0d14;
}

.brand h1 {
  margin: 0;
  font-size: 21px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.05em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar .engine-note {
  color: var(--muted);
  font-size: 12.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.install-btn {
  width: auto;
  padding: 8px 14px;
  font-size: 12.5px;
  border-color: rgba(139, 92, 246, 0.45);
  background: rgba(139, 92, 246, 0.14);
}

.install-btn[hidden] { display: none; }

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 12px var(--accent-2);
}

/* ---------- Раскладка ---------- */

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 330px;
  gap: clamp(18px, 2.6vw, 34px);
  align-items: start;
  padding: 14px clamp(16px, 4vw, 44px) 48px;
  max-width: 1280px;
  margin: 0 auto;
}

.board-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.board-stage {
  display: grid;
  width: 100%;
  justify-content: center;
  align-items: stretch;
}

.board-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- Доска ---------- */

.board-wrap {
  position: relative;
  padding: 14px;
  border-radius: calc(var(--radius) + 6px);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: var(--board);
  height: var(--board);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  touch-action: manipulation;
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  user-select: none;
  cursor: default;
}

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

.square .coord {
  position: absolute;
  font-size: 10px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.34);
  pointer-events: none;
}

.square .coord.file { right: 4px; bottom: 2px; }
.square .coord.rank { left: 4px; top: 2px; }

.square.selectable { cursor: pointer; }

.square.last-move::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(139, 92, 246, 0.3);
  box-shadow: inset 0 0 0 2px rgba(139, 92, 246, 0.55);
  pointer-events: none;
}

.square.selected::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(34, 211, 238, 0.28);
  box-shadow: inset 0 0 0 2px var(--accent-2);
  pointer-events: none;
}

.square.check::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(244, 63, 94, 0.72), transparent 68%);
  pointer-events: none;
}

.square .hint {
  position: absolute;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: rgba(226, 232, 255, 0.32);
  box-shadow: 0 0 14px rgba(139, 92, 246, 0.55);
  pointer-events: none;
  animation: pop 0.18s ease-out;
}

.square .hint.capture {
  width: 86%;
  height: 86%;
  background: transparent;
  border: 4px solid rgba(244, 63, 94, 0.6);
  box-shadow: 0 0 18px rgba(244, 63, 94, 0.4);
}

@keyframes pop {
  from { transform: scale(0.4); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.piece {
  position: relative;
  z-index: 2;
  font-size: 78%;
  line-height: 1;
  cursor: grab;
  transition: transform 0.12s ease;
  will-change: transform;
  touch-action: none;
}

.square { font-size: calc(var(--board) / 8.6); }

.piece.white {
  color: var(--piece-white);
  text-shadow:
    0 0 2px rgba(6, 8, 14, 0.9),
    0 3px 7px rgba(0, 0, 0, 0.6);
}

.piece.black {
  color: var(--piece-black);
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.75),
    0 0 1px rgba(226, 232, 255, 0.55);
}

.piece.dragging {
  opacity: 0.35;
}

.piece:active { cursor: grabbing; }

.drag-ghost {
  position: fixed;
  z-index: 999;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(1.08);
  filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.6));
  line-height: 1;
}

.board.thinking { pointer-events: none; }

/* ---------- Игроки над/под доской ---------- */

.player-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
}

.player-row .who {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.player-row .avatar {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  font-size: 17px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
}

.player-row.active {
  border-color: rgba(139, 92, 246, 0.55);
  box-shadow: 0 0 22px rgba(139, 92, 246, 0.18);
}

.captured {
  display: flex;
  align-items: center;
  gap: 1px;
  font-size: 19px;
  line-height: 1;
  color: var(--muted);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.captured .piece {
  cursor: default;
  font-size: 19px;
}

.captured .adv {
  font-size: 12px;
  font-weight: 700;
  color: var(--text);
  margin-left: 6px;
}

/* ---------- Боковая панель ---------- */

.side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.3);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.status {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status .badge {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 20px;
  background: linear-gradient(140deg, rgba(139, 92, 246, 0.35), rgba(34, 211, 238, 0.2));
  border: 1px solid var(--border);
}

.status .text strong {
  display: block;
  font-size: 15px;
}

.status .text span {
  color: var(--muted);
  font-size: 12.5px;
}

.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }

.field label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 7px;
  letter-spacing: 0.03em;
}

.segmented {
  display: grid;
  grid-auto-flow: column;
  gap: 6px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
}

.segmented button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  padding: 8px 6px;
  border-radius: 9px;
  cursor: pointer;
  transition: all 0.16s ease;
}

.segmented button:hover { color: var(--text); }

.segmented button.active {
  background: linear-gradient(140deg, rgba(139, 92, 246, 0.85), rgba(139, 92, 246, 0.55));
  color: #fff;
  box-shadow: 0 6px 16px rgba(139, 92, 246, 0.35);
}

.segmented.triple button { font-size: 12.5px; padding: 8px 4px; }

.mode-options[hidden] { display: none; }
.mode-options .field { margin-top: 14px; margin-bottom: 0; }

.hint-text {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

/* ---------- Состояние соединения ---------- */

.net-status {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 14px 0;
  font-size: 13px;
  color: var(--muted);
}

.net-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #4b5266;
  flex: none;
}

.net-dot.connecting, .net-dot.waiting {
  background: #f59e0b;
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.7);
  animation: pulse 1.4s ease-in-out infinite;
}

.net-dot.live {
  background: #34d399;
  box-shadow: 0 0 12px rgba(52, 211, 153, 0.8);
}

.net-dot.closed {
  background: var(--danger);
  box-shadow: 0 0 12px rgba(244, 63, 94, 0.6);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

select, .btn {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.16s ease;
}

select:hover, .btn:hover {
  border-color: rgba(139, 92, 246, 0.5);
  background: rgba(139, 92, 246, 0.12);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn.primary {
  background: linear-gradient(140deg, var(--accent), #6d28d9);
  border-color: transparent;
  font-weight: 600;
  box-shadow: 0 10px 26px rgba(139, 92, 246, 0.32);
}

.btn.primary:hover { filter: brightness(1.1); }

.btn.danger {
  border-color: rgba(244, 63, 94, 0.4);
  color: #ffd8de;
}

.btn.danger:hover {
  background: rgba(244, 63, 94, 0.16);
  border-color: rgba(244, 63, 94, 0.7);
}

.btn[hidden] { display: none; }

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* ---------- Кредиты на отмену хода ---------- */

.credits-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(139, 92, 246, 0.07);
}

.credits-line[hidden] {
  display: none;   /* без этого display:flex перебивает атрибут hidden */
}

.credits-count {
  color: var(--muted);
  font-size: 13px;
}

.credits-count b {
  color: var(--text);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.credits-count.low b {
  color: var(--danger);
}

.credits-get {
  border: 1px solid rgba(139, 92, 246, 0.5);
  border-radius: 10px;
  padding: 5px 12px;
  background: transparent;
  color: var(--accent-2);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.credits-get:hover {
  background: rgba(139, 92, 246, 0.16);
}

.credits-get[hidden] {
  display: none;
}

/* ---------- История ходов ---------- */

.moves {
  max-height: 260px;
  overflow-y: auto;
  font-variant-numeric: tabular-nums;
  scrollbar-width: thin;
  scrollbar-color: rgba(139, 92, 246, 0.5) transparent;
}

.moves::-webkit-scrollbar { width: 6px; }
.moves::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.5);
  border-radius: 4px;
}

.moves .row {
  display: grid;
  grid-template-columns: 34px 1fr 1fr;
  gap: 6px;
  padding: 4px 2px;
  border-radius: 8px;
}

.moves .row:nth-child(odd) { background: rgba(255, 255, 255, 0.025); }
.moves .num { color: var(--muted); font-size: 12.5px; }
.moves .san { font-size: 13.5px; }
.moves .san.last {
  color: var(--accent-2);
  font-weight: 700;
}

.moves .empty {
  color: var(--muted);
  font-size: 13px;
  padding: 6px 2px;
}

/* ---------- Модальные окна ---------- */

.overlay {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  background: rgba(4, 5, 9, 0.72);
  backdrop-filter: blur(6px);
  z-index: 100;
  padding: 20px;
}

.overlay.open { display: grid; }

.modal {
  background: linear-gradient(160deg, #161a26, #0d1017);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 26px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 380px;
  width: 100%;
  animation: rise 0.22s ease-out;
}

@keyframes rise {
  from { transform: translateY(14px); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.modal .icon { font-size: 44px; line-height: 1; }
.modal h3 { margin: 12px 0 6px; font-size: 21px; }
.modal p { margin: 0 0 20px; color: var(--muted); font-size: 14px; }

.promo-choices {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 6px;
}

.promo-choices button {
  font-size: 42px;
  line-height: 1;
  padding: 10px 0;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: all 0.16s ease;
}

.promo-choices button:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: rgba(139, 92, 246, 0.6);
  transform: translateY(-2px);
}

.promo-choices button.white {
  color: var(--piece-white);
  text-shadow: 0 0 2px rgba(6, 8, 14, 0.9), 0 3px 7px rgba(0, 0, 0, 0.6);
}

.promo-choices button.black {
  color: var(--piece-black);
  text-shadow: 0 0 2px rgba(214, 222, 250, 0.9), 0 3px 7px rgba(0, 0, 0, 0.5);
}

/* ---------- Мастер подключения ---------- */

.modal.wide {
  max-width: 460px;
  position: relative;
  text-align: left;
  max-height: 88vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(139, 92, 246, 0.5) transparent;
}

.modal.wide .icon,
.modal.wide h3,
.modal.wide > .net-screen > p:first-of-type { text-align: center; }

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.16s ease;
}

.modal-close:hover {
  color: var(--text);
  border-color: rgba(139, 92, 246, 0.5);
  background: rgba(139, 92, 246, 0.14);
}

.net-screen[hidden] { display: none; }

.net-screen .btn-row { margin-top: 4px; }

.room-code {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-align: center;
  padding: 14px 0 16px;
  color: var(--accent-2);
  text-shadow: 0 0 26px rgba(34, 211, 238, 0.45);
}

.text-input {
  width: 100%;
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.34);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  resize: vertical;
}

.text-input:focus {
  outline: none;
  border-color: rgba(139, 92, 246, 0.6);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.16);
}

.code-area {
  min-height: 76px;
  font-family: "Consolas", "SF Mono", ui-monospace, monospace;
  font-size: 11.5px;
  line-height: 1.45;
  word-break: break-all;
  margin-bottom: 10px;
}

.code-input {
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  padding: 12px;
}

.step-label {
  margin: 16px 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

/* ---------- Адаптив ---------- */

/* Широкий экран: доска делит строку с боковой панелью, поэтому считаем её
   ширину от колонки, а не от всего окна — иначе доска наезжает на настройки.
   Вычитаем панель (330px), поля страницы, зазор между колонками и рамку доски. */
@media (min-width: 981px) {
  :root {
    --board: min(
      78vmin,
      620px,
      calc(min(100vw, 1280px) - 330px - 2 * clamp(16px, 4vw, 44px) - clamp(18px, 2.6vw, 34px) - 28px)
    );
  }
}

/* Вычитаемое — это поля страницы, рамка доски и небольшой запас:
   без запаса доска упирается в край экрана и обрезается. */
@media (max-width: 980px) {
  :root { --board: min(88vmin, 560px, calc(100vw - 96px)); }
  .layout { grid-template-columns: 1fr; }
  .side { position: static; }
}

@media (max-width: 520px) {
  :root { --board: min(94vmin, 560px, calc(100vw - 56px)); }
  .board-wrap { padding: 10px; }
  .brand h1 { font-size: 17px; }
  .topbar .engine-note { display: none; }
  .card { padding: 14px; }
}

/* ---------- Установленное приложение и телефоны ---------- */

html {
  /* Никакого «оттягивания» страницы при перетаскивании фигуры */
  overscroll-behavior: none;
}

body {
  -webkit-tap-highlight-color: transparent;
  /* dvh учитывает исчезающие панели браузера на телефоне */
  min-height: 100dvh;
}

/* Вырез и скруглённые углы экрана: держим контент в безопасной зоне */
.topbar {
  padding-top: calc(22px + env(safe-area-inset-top));
  padding-left: calc(clamp(16px, 4vw, 44px) + env(safe-area-inset-left));
  padding-right: calc(clamp(16px, 4vw, 44px) + env(safe-area-inset-right));
}

.layout {
  padding-left: calc(clamp(16px, 4vw, 44px) + env(safe-area-inset-left));
  padding-right: calc(clamp(16px, 4vw, 44px) + env(safe-area-inset-right));
  padding-bottom: calc(48px + env(safe-area-inset-bottom));
}

/* Подсказка перед выходом из Android-приложения */
.native-toast {
  position: fixed;
  left: 50%;
  bottom: calc(28px + env(safe-area-inset-bottom));
  transform: translate(-50%, 12px);
  z-index: 60;
  padding: 11px 18px;
  border-radius: 999px;
  background: rgba(18, 21, 31, 0.96);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 13.5px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.native-toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.native-toast[hidden] { display: none; }

/* В установленном приложении шапка не нужна такой крупной */
@media (display-mode: standalone) {
  .topbar { padding-bottom: 2px; }
  .install-btn { display: none; }
}