:root {
  --bg-deep: #0a0c10;
  --bg-mid: #12151c;
  --surface: rgba(24, 28, 38, 0.88);
  --surface-elevated: rgba(32, 38, 52, 0.95);
  --border: rgba(255, 255, 255, 0.08);
  --text: #f0f2f8;
  --text-muted: #8b95a8;
  --accent: #d4a853;
  --accent-soft: rgba(212, 168, 83, 0.16);
  --accent-glow: rgba(212, 168, 83, 0.35);
  --danger: #e07a7a;
  --success: #7bc9a0;
  --sq-light: #e8e0d4;
  --sq-dark: #6b8f71;
  --sq-light-dim: #c9c0b4;
  --sq-dark-dim: #567a5c;
  --highlight: rgba(212, 168, 83, 0.55);
  --last-move: rgba(120, 180, 220, 0.45);
  --check-glow: rgba(224, 122, 122, 0.5);
  --radius: 18px;
  --radius-sm: 10px;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-display: "Fraunces", Georgia, serif;
  --board-size: min(72vmin, 520px);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(212, 168, 83, 0.12), transparent 55%),
    radial-gradient(ellipse 50% 30% at 100% 50%, rgba(70, 90, 120, 0.1), transparent),
    linear-gradient(168deg, var(--bg-deep), var(--bg-mid) 50%, #080a0e);
  background-attachment: fixed;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 2.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.top__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.top__brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.top__glyph {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.brand {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
}

.tag {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pill {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.pill--idle {
  color: var(--text-muted);
}

.pill--ok {
  color: var(--success);
  border-color: rgba(123, 201, 160, 0.35);
  background: rgba(123, 201, 160, 0.1);
}

.pill--bad {
  color: var(--danger);
  border-color: rgba(224, 122, 122, 0.35);
  background: rgba(224, 122, 122, 0.1);
}

.main {
  flex: 1;
}

.lobby {
  max-width: 520px;
  margin: 0 auto;
}

.lobby__hero {
  margin-bottom: 1.75rem;
}

.lobby__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 600;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
}

.lobby__lead {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.02rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.field {
  display: block;
  margin-bottom: 1rem;
}

.field__label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.field__optional {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

.field__input {
  width: 100%;
  padding: 0.75rem 1rem;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field__input:focus {
  border-color: rgba(212, 168, 83, 0.5);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field__input--code {
  font-family: ui-monospace, "SF Mono", monospace;
  font-size: 1.35rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.1rem;
}

.card--cpu {
  margin-top: 1.25rem;
}

.card--cpu__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.card--cpu__lead {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.field__input--select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%238b95a8' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2rem;
}

.btn--block {
  width: 100%;
  margin-top: 0.25rem;
}

.btn {
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.25rem;
  transition: transform 0.12s, background 0.15s, opacity 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn--primary {
  color: #1a1408;
  background: linear-gradient(135deg, #e8c878, var(--accent));
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover:not(:disabled) {
  filter: brightness(1.06);
}

.btn--ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
}

.btn--ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
}

.btn--danger {
  color: #fff;
  background: rgba(224, 122, 122, 0.25);
  border: 1px solid rgba(224, 122, 122, 0.4);
}

.btn--small {
  font-size: 0.82rem;
  padding: 0.4rem 0.85rem;
}

.form-error {
  margin: 0.75rem 0 0;
  color: var(--danger);
  font-size: 0.9rem;
}

.lobby__features {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.lobby__features li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
}

.lobby__features li:last-child {
  border-bottom: none;
}

.game {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .game {
    grid-template-columns: 1fr;
  }

  .game__side {
    order: 2;
  }

  .game__board-wrap {
    order: 1;
    display: flex;
    justify-content: center;
  }
}

.game__side {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.room-card,
.status-card,
.players-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}

.room-card__label {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.room-card__code-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.room-card__code {
  font-family: ui-monospace, monospace;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.room-card__role {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.qr-share {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.qr-share__label {
  margin: 0 0 0.65rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.qr-share__frame {
  display: inline-block;
  padding: 0.5rem;
  background: #f4f0e8;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.qr-share__img {
  display: block;
  width: 200px;
  height: 200px;
  border-radius: 4px;
}

.qr-share__url {
  margin: 0.6rem 0 0;
  font-size: 0.72rem;
  font-family: ui-monospace, monospace;
  color: var(--text-muted);
  word-break: break-all;
  line-height: 1.4;
}

.status-card__turn {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.status-card__msg {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 1.2em;
}

.status-card__msg--check {
  color: var(--danger);
}

.status-card__msg--error {
  color: var(--danger);
}

.player-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  padding: 0.35rem 0;
}

.player-row__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.player-row--light .player-row__dot {
  background: #f4f0e8;
}

.player-row--dark .player-row__dot {
  background: #2a2a32;
}

.player-row__seat {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.player-row__points {
  font-size: 0.82rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  min-width: 1.5rem;
  text-align: right;
}

.player-row__material {
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  min-width: 2.5rem;
  text-align: right;
}

.players-card__legend {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  font-size: 0.68rem;
  color: var(--text-muted);
  padding: 0 0 0.35rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.25rem;
}

.players-card__legend span {
  min-width: 2.5rem;
  text-align: right;
}

.players-card__legend span:first-child {
  min-width: 1.5rem;
}

.draw-banner {
  background: var(--accent-soft);
  border: 1px solid rgba(212, 168, 83, 0.35);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.88rem;
}

.draw-banner p {
  margin: 0 0 0.5rem;
}

.draw-banner__actions {
  display: flex;
  gap: 0.4rem;
}

.game__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.move-list {
  margin: 0;
  padding: 0.65rem 0.85rem;
  max-height: 140px;
  overflow-y: auto;
  font-size: 0.78rem;
  font-family: ui-monospace, monospace;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  line-height: 1.7;
}

.board-stage {
  position: relative;
  width: 100%;
}

.board-stage__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.board-stage__status {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.board-stage__fs-btn {
  flex-shrink: 0;
}

@media (max-width: 860px) {
  .board-stage__fs-btn {
    font-size: 0.88rem;
    padding: 0.5rem 0.9rem;
  }
}

.game__board-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

/* Full screen: native API (:fullscreen) + iOS-friendly fixed overlay */
.board-stage:fullscreen,
.board-stage--immersive {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding:
    max(0.75rem, env(safe-area-inset-top))
    max(0.75rem, env(safe-area-inset-right))
    max(0.75rem, env(safe-area-inset-bottom))
    max(0.75rem, env(safe-area-inset-left));
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(212, 168, 83, 0.1), transparent 55%),
    linear-gradient(168deg, var(--bg-deep), #080a0e);
  overflow: hidden;
  --board-size: min(
    calc(100vmin - 5.5rem),
    calc(100vw - 3.25rem)
  );
}

.board-stage:fullscreen .board-stage__toolbar,
.board-stage--immersive .board-stage__toolbar {
  width: 100%;
  max-width: calc(var(--board-size) + 2.5rem);
  margin-bottom: 0.65rem;
}

.board-stage:fullscreen .board-stage__status,
.board-stage--immersive .board-stage__status {
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1rem;
}

body.board-stage-open {
  overflow: hidden;
}

.board-frame {
  display: grid;
  grid-template-columns: 1.6rem var(--board-size);
  grid-template-rows: var(--board-size) 1.25rem;
  gap: 0.2rem 0.35rem;
  align-items: stretch;
}

.board-frame__ranks {
  grid-column: 1;
  grid-row: 1;
  display: grid;
  grid-template-rows: repeat(8, 1fr);
  align-items: center;
  justify-items: end;
  padding-right: 0.15rem;
}

.board-frame__grid {
  grid-column: 2;
  grid-row: 1;
}

.board-frame__files {
  grid-column: 2;
  grid-row: 2;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  align-items: start;
  justify-items: center;
  padding-top: 0.1rem;
}

.board-coord {
  font-size: 0.68rem;
  font-weight: 600;
  font-family: ui-monospace, "SF Mono", monospace;
  color: var(--text-muted);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.board {
  width: var(--board-size);
  height: var(--board-size);
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4),
    0 24px 60px rgba(0, 0, 0, 0.5),
    0 0 80px var(--accent-glow);
}

.board--flipped {
  transform: rotate(180deg);
}

.board--flipped .sq__piece {
  transform: rotate(180deg);
}

.sq {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  user-select: none;
  -webkit-user-select: none;
}

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

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

.sq--selected {
  box-shadow: inset 0 0 0 3px var(--highlight);
}

.sq--target::after {
  content: "";
  position: absolute;
  width: 28%;
  height: 28%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.22);
}

.sq--capture.sq--target::after {
  width: 78%;
  height: 78%;
  border-radius: 50%;
  background: transparent;
  border: 3px solid rgba(0, 0, 0, 0.25);
}

.sq--last {
  background-color: color-mix(in srgb, var(--sq-light) 70%, var(--last-move)) !important;
}

.sq--dark.sq--last {
  background-color: color-mix(in srgb, var(--sq-dark) 70%, var(--last-move)) !important;
}

.sq--check {
  box-shadow: inset 0 0 0 4px var(--check-glow);
}

.sq--can-play {
  cursor: pointer;
}

.sq__piece {
  font-size: clamp(1.6rem, 8vmin, 3.2rem);
  line-height: 1;
  pointer-events: none;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
  z-index: 1;
}

.sq__piece--w {
  color: #fffef8;
  -webkit-text-stroke: 1px rgba(0, 0, 0, 0.35);
}

.sq__piece--b {
  color: #1a1a22;
}

.sq--promotion {
  z-index: 2;
}

.sq__promotion {
  position: absolute;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 4px;
  background: rgba(10, 12, 16, 0.82);
  border-radius: 4px;
  z-index: 3;
}

.board--flipped .sq__promotion {
  transform: rotate(180deg);
}

.sq__promotion-btn {
  flex: 1 1 40%;
  min-width: 0;
  font-size: clamp(1rem, 4vmin, 1.5rem);
  line-height: 1;
  padding: 0.2rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-elevated);
  color: var(--accent);
  cursor: pointer;
}

.sq__promotion-btn:hover {
  background: var(--accent-soft);
  border-color: rgba(212, 168, 83, 0.5);
}

.foot {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

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