:root {
  --page-bg: #faf8ef;
  --page-bg-2: #f5efe4;
  --panel-text: #776e65;
  --panel-muted: #9c948a;
  --board-bg: #bbada0;
  --cell-bg: rgba(238, 228, 218, 0.35);
  --btn-bg: #8f7a66;
  --btn-bg-hover: #7f6a56;
  --btn-text: #f9f6f2;
  --shadow: rgba(0, 0, 0, 0.18);
  --seg-bg: #e8dfd2;
  --seg-active: #ffffff;

  --pad-x: 18px;
  --board-size: min(calc(100vw - var(--pad-x) * 2), calc(100dvh - 180px), 500px);
  --gap: clamp(3px, calc(var(--board-size) * 0.025), 15px);

  --move-ms: 80ms;
  --pop-ms: 130ms;
  --appear-ms: 100ms;

  --render-dpr-cap: 3;
  --render-dpr-scale: 1;
}

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

html {
  overflow-y: overlay;
  scrollbar-width: none;
}

::-webkit-scrollbar {
  width: 3px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

body {
  min-height: 100%;
  margin: 0;
  font-family: "Rubik", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(187, 173, 160, 0.08) 0%, transparent 70%),
    var(--page-bg);
  color: var(--panel-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px var(--pad-x) 40px;
  display: grid;
  gap: 18px;
  position: relative;
  z-index: 1;
}

.header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.title-area {
  min-width: 180px;
  flex: 1 1 auto;
}

.title {
  font-size: 72px;
  letter-spacing: -2.5px;
  margin: 0;
  line-height: 1;
  font-weight: 900;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--panel-muted);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.2px;
}

.panel {
  display: grid;
  gap: 12px;
  justify-items: end;
}

.scores {
  display: flex;
  gap: 10px;
}

.score-card {
  background: var(--board-bg);
  color: var(--btn-text);
  min-width: 104px;
  padding: 10px 14px;
  border-radius: 6px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.score-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 50%);
  pointer-events: none;
  border-radius: inherit;
}

.score-label {
  font-size: 11px;
  letter-spacing: 1px;
  opacity: 0.85;
  font-weight: 700;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

.score-value {
  margin-top: 4px;
  font-size: 22px;
  font-weight: 800;
  position: relative;
  z-index: 1;
}

.actions {
  display: flex;
  gap: 10px;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.3px;
  cursor: pointer;
  background: var(--btn-bg);
  color: var(--btn-text);
  box-shadow: 0 6px 14px -10px var(--shadow);
  transition: background 150ms ease, transform 100ms ease, box-shadow 150ms ease;
}

.btn:hover {
  background: var(--btn-bg-hover);
  box-shadow: 0 8px 18px -8px var(--shadow);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: 0 3px 8px -6px var(--shadow);
}

.btn-primary {
  background: #edc22e;
  color: #5b5146;
  box-shadow: 0 6px 14px -8px rgba(0,0,0,0.22);
}

.btn-primary:hover {
  background: #e4b923;
  box-shadow: 0 8px 18px -6px rgba(0,0,0,0.25);
}

/* ── Grid size selector ── */

.grid-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.grid-bar-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--panel-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.grid-seg {
  position: relative;
  display: inline-flex;
  background: var(--seg-bg);
  border-radius: 8px;
  padding: 4px;
  gap: 2px;
}

.grid-seg input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}

.grid-seg-label {
  position: relative;
  z-index: 1;
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--panel-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: color 180ms ease;
  user-select: none;
  letter-spacing: 0.3px;
  font-variant-numeric: tabular-nums;
}

.grid-seg-label:hover {
  color: var(--panel-text);
}

.grid-seg input:checked + .grid-seg-label {
  color: var(--panel-text);
}

.grid-seg-pill {
  position: absolute;
  top: 4px;
  left: 4px;
  height: calc(100% - 8px);
  border-radius: 6px;
  background: var(--seg-active);
  box-shadow: 0 2px 8px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

/* Pill positions: auto-calculated via JS, fallback defaults */
.grid-seg[data-active="0"] .grid-seg-pill { width: 46px; transform: translateX(0); }
.grid-seg[data-active="1"] .grid-seg-pill { width: 46px; transform: translateX(48px); }
.grid-seg[data-active="2"] .grid-seg-pill { width: 46px; transform: translateX(96px); }

/* ── Board ── */

.game-area {
  display: grid;
  justify-items: center;
  gap: 10px;
  max-width: 100%;
  overflow: hidden;
}

.status {
  height: 18px;
  font-size: 14px;
  color: var(--panel-muted);
  font-weight: 500;
}

.board {
  position: relative;
  width: var(--board-size);
  height: var(--board-size);
  background: var(--board-bg);
  border-radius: 10px;
  padding: 0;
  touch-action: none;
  user-select: none;
  contain: layout;
  box-shadow:
    0 12px 32px rgba(0, 0, 0, 0.10),
    0 4px 8px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255,255,255,0.15);
}

.stage {
  position: absolute;
  inset: 0;
}

.stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 10px;
}

/* ── Overlay ── */

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(238, 228, 218, 0.76);
  border-radius: 10px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.overlay[hidden] {
  display: none;
}

.overlay-card {
  display: grid;
  gap: 14px;
  justify-items: center;
}

.overlay-title {
  font-size: 44px;
  font-weight: 900;
  color: #776e65;
  letter-spacing: -1px;
}

/* ── Responsive ── */

@media (max-width: 540px) {
  :root { --pad-x: 10px; }
  :root {
    --move-ms: 70ms;
    --pop-ms: 120ms;
    --appear-ms: 90ms;
    --render-dpr-cap: 2;
  }

  .overlay {
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
  }

  .page {
    padding: 16px var(--pad-x) 24px;
    gap: 10px;
  }

  .header {
    flex-direction: column;
    align-items: stretch;
  }

  .title {
    font-size: 40px;
  }

  .panel {
    justify-items: stretch;
  }

  .scores {
    justify-content: space-between;
    gap: 6px;
  }

  .score-card {
    min-width: 0;
    flex: 1;
    padding: 6px 10px;
  }

  .score-value {
    font-size: 18px;
  }

  .actions {
    justify-content: flex-end;
  }

  .lobby-tab {
    padding: 6px 14px;
    font-size: 13px;
  }

  .grid-seg-label {
    padding: 6px 10px;
    font-size: 12px;
  }

  .conn-input {
    width: 180px;
  }

  .overlay-title {
    font-size: 28px;
  }
}

@media (max-width: 380px) {
  :root { --pad-x: 6px; }

  .page {
    padding: 10px var(--pad-x) 20px;
    gap: 8px;
  }

  .title {
    font-size: 32px;
  }

  .subtitle {
    font-size: 11px;
  }

  .lobby-tab {
    padding: 5px 10px;
    font-size: 12px;
  }

  .score-value {
    font-size: 16px;
  }

  .score-card {
    padding: 4px 8px;
  }

  .btn {
    padding: 8px 10px;
    font-size: 12px;
  }

  .conn-input {
    width: 140px;
    font-size: 12px;
  }

  .overlay-title {
    font-size: 24px;
  }
}

/* ── Connection bar ── */

.conn-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.conn-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #e74c3c;
  flex-shrink: 0;
  transition: background 200ms ease;
}

.conn-dot.connected {
  background: #2ecc71;
}

.conn-input {
  width: 260px;
  max-width: calc(100vw - 160px);
  padding: 6px 10px;
  font-family: inherit;
  font-weight: 600;
  font-size: 13px;
  border: 2px solid var(--seg-bg);
  border-radius: 6px;
  background: #fff;
  color: var(--panel-text);
  outline: none;
  transition: border-color 150ms ease;
}

.conn-input:focus {
  border-color: var(--board-bg);
}

.conn-btn {
  min-width: 80px;
  text-align: center;
}

/* ── Nickname bar ── */

.nick-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.nick-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--panel-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.nick-input {
  width: 160px;
  padding: 6px 10px;
  font-family: inherit;
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--seg-bg);
  border-radius: 6px;
  background: #fff;
  color: var(--panel-text);
  outline: none;
  text-align: center;
  transition: border-color 150ms ease;
}

.nick-input:focus {
  border-color: var(--board-bg);
}

/* ── Lobby tabs ── */

.lobby-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
}

.lobby-tab {
  appearance: none;
  border: 0;
  border-radius: 8px;
  padding: 8px 20px;
  font-family: inherit;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  background: var(--seg-bg);
  color: var(--panel-muted);
  transition: background 150ms ease, color 150ms ease;
}

.lobby-tab.active {
  background: var(--btn-bg);
  color: var(--btn-text);
}

.lobby-tab:hover:not(.active) {
  color: var(--panel-text);
}

/* ── Lobby panels ── */

.lobby-panel.hidden {
  display: none;
}

.battle-config {
  display: grid;
  gap: 12px;
  justify-items: center;
  padding: 8px 0;
}

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

.config-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--panel-muted);
  min-width: 36px;
  text-align: right;
}

.seg-row {
  display: flex;
  gap: 3px;
  background: var(--seg-bg);
  border-radius: 7px;
  padding: 3px;
}

.seg-btn {
  appearance: none;
  border: 0;
  border-radius: 5px;
  padding: 6px 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  background: transparent;
  color: var(--panel-muted);
  transition: background 150ms ease, color 150ms ease;
}

.seg-btn.active {
  background: #fff;
  color: var(--panel-text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* ── Battle header ── */

.battle-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 2px 0 0;
  margin-bottom: -12px;
}

.battle-header.hidden {
  display: none;
}

.battle-score {
  text-align: center;
  min-width: 90px;
}

.battle-score-label {
  font-size: 12px;
  color: var(--panel-muted);
  font-weight: 700;
  letter-spacing: 1px;
}

.battle-score-name {
  font-weight: 900;
  font-size: 16px;
  color: var(--panel-text);
}

.battle-score-value {
  font-weight: 900;
  font-size: 38px;
  color: var(--panel-text);
}

.battle-timer {
  font-weight: 900;
  font-size: 38px;
  color: #f65e3b;
  min-width: 72px;
  text-align: center;
}

.battle-timer.timer-pulse {
  animation: timer-pulse 0.5s ease-in-out infinite;
}

@keyframes timer-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); color: #e01818; }
}

/* ── Join room panel ── */

.join-room-form {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.join-room-form .btn {
  height: 42px;
  padding: 0 20px;
  border: 2px solid transparent;
  box-shadow: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.join-room-form .btn:hover { box-shadow: none; transform: none; }
.join-room-form .btn:active { transform: none; }

.join-input-lg {
  width: 180px;
  height: 42px;
  padding: 0 14px;
  font-family: inherit;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 4px;
  text-transform: uppercase;
  text-align: center;
  border: 2px solid var(--seg-bg);
  border-radius: 8px;
  background: #fff;
  color: var(--panel-text);
  outline: none;
  line-height: 44px;
}

.join-input-lg::placeholder {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--panel-muted);
  text-transform: none;
}

.join-input-lg:focus {
  border-color: var(--board-bg);
}

/* ── Opponent mini-board ── */

.opp-mini {
  position: absolute;
  left: calc(100% + 10px);
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  opacity: 0.65;
  z-index: 2;
}

.opp-mini.hidden {
  display: none;
}

.opp-mini-label {
  font-size: 8px;
  color: var(--panel-text);
  font-weight: 600;
}

.opp-mini-board {
  width: 110px;
  height: 110px;
  background: var(--board-bg);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

/* ── Overlay scores ── */

.overlay-scores {
  font-size: 14px;
  color: var(--panel-muted);
  text-align: center;
}

.overlay-scores.hidden {
  display: none;
}

.overlay-actions.hidden {
  display: none;
}

/* ── Responsive ── */

@media (max-width: 540px) {
  .battle-header {
    gap: 8px;
    margin-bottom: -8px;
  }
  .battle-score {
    min-width: 64px;
  }
  .battle-score-value {
    font-size: 24px;
  }
  .battle-timer {
    font-size: 24px;
  }
  .opp-mini {
    left: auto;
    right: 0;
    bottom: -62px;
    flex-direction: row;
    gap: 4px;
  }
  .opp-mini-board {
    width: 90px;
    height: 90px;
  }
}

/* ── Disabled state ── */

.lobby-tab.disabled,
.btn.disabled {
  opacity: 0.35;
  pointer-events: none;
  cursor: not-allowed;
}

/* ── Waiting panel ── */

.waiting-panel {
  display: flex;
  justify-content: center;
  padding: 16px 0;
}

.waiting-panel.hidden {
  display: none;
}

.waiting-card {
  text-align: center;
  background: #f9f6f2;
  border-radius: 12px;
  padding: 28px 36px;
  min-width: 280px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.waiting-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--panel-text);
  margin-bottom: 8px;
}

.waiting-code {
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--panel-muted);
}

.waiting-code strong {
  font-size: 28px;
  letter-spacing: 4px;
  color: var(--panel-text);
  display: block;
  margin-top: 4px;
}

.waiting-info {
  font-size: 13px;
  color: var(--panel-muted);
  margin-bottom: 16px;
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* Bouncing dots spinner */
.waiting-spinner {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-bottom: 14px;
}

.waiting-spinner .dot {
  width: 10px;
  height: 10px;
  background: var(--board-bg);
  border-radius: 50%;
  animation: dot-bounce 1.2s ease-in-out infinite;
}

.waiting-spinner .dot:nth-child(2) {
  animation-delay: 0.15s;
}

.waiting-spinner .dot:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes dot-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}