/* ── Menu container (top-right floating) ─────────────────────────────── */

.mode-selector {
  position: fixed;
  top: 74px;
  right: 20px;
  display: flex;
  flex-direction: row;
  gap: 0;
  padding: 0;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.12));
  z-index: 300;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  box-sizing: border-box;
  align-items: stretch;
}

.menu-panels {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
  background: var(--surface-panel-card-bright);
  border-radius: var(--menu-surface-radius) 0 var(--menu-surface-radius) var(--menu-surface-radius);
  box-shadow: none;
  width: min(320px, calc(100vw - 64px));
  box-sizing: border-box;
  max-height: calc(var(--visual-viewport-height, 100vh) + var(--visual-viewport-offset-top, 0px) - 74px - 10px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-bottom: calc(16px + env(safe-area-inset-bottom));
  order: 2;
}

.mode-selector--hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ── Menu sections ───────────────────────────────────────────────────── */

.menu-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.menu-section--hidden {
  display: none;
}

.menu-section__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: #8a623f;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
  padding: 0 4px;
}

.menu-section__help {
  margin: 0;
  padding: 0 4px;
  font-size: 0.75rem;
  line-height: 1.35;
  color: var(--color-brown-muted);
}

.menu-section__buttons {
  display: flex;
  padding-top: 10px;
  gap: 4px;
  justify-content: center;
}

#menu-tabs {
  display: flex;
  flex-direction: column;
  gap: 0;
  order: 3;
  margin-top: 0;
  padding-top: 0;
  padding-bottom: calc(var(--menu-surface-radius) + 4px);
}

.menu-panel .menu-section__buttons:not(#menu-tabs) {
  padding: 4px;
  border-radius: 8px;
  background: var(--menu-panel-highlight);
  justify-content: stretch;
}

.menu-section__links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 6px;
  min-width: 0;
}

.menu-section__links-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: flex-start;
  gap: 12px;
}

.menu-section__meta {
  font-size: 0.8rem;
  color: var(--color-brown-muted);
  white-space: nowrap;
  align-self: center;
}

.menu-section__meta-group {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  justify-self: end;
  text-align: right;
}

.menu-link {
  font-size: 0.9rem;
  color: var(--color-brown-warm);
  text-decoration: underline;
  text-underline-offset: 2px;
  overflow-wrap: anywhere;
}

.menu-link--meta {
  font-size: 0.75rem;
}

.menu-link--inline {
  margin-left: 0.3em;
}

.menu-link:focus-visible {
  outline: 2px solid #8a623f;
  outline-offset: 2px;
}

.menu-collapsible__toggle {
  width: 100%;
  border: none;
  background: transparent;
  padding: 0 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.menu-collapsible__toggle .menu-section__label {
  padding: 0;
}

.menu-collapsible__toggle:focus-visible {
  outline: 2px solid rgba(138, 98, 63, 0.55);
  outline-offset: 2px;
  border-radius: 8px;
}

.menu-collapsible__chevron {
  width: 9px;
  height: 9px;
  border-right: 2px solid #8a623f;
  border-bottom: 2px solid #8a623f;
  transform: rotate(45deg);
  transition: transform 0.16s ease;
  flex: 0 0 auto;
  margin-right: 4px;
}

.menu-collapsible__toggle[aria-expanded="false"] .menu-collapsible__chevron {
  transform: rotate(-45deg);
}

.menu-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

/* ── Online / games panels embedded in menu ──────────────────────────── */

.online-panel,
.games-panel {
  margin-top: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 0;
}

.games-panel--framed {
  border: var(--menu-panel-border-strong);
  border-radius: 10px;
  padding: 6px;
  background: var(--surface-panel-card);
  box-shadow: none;
}

.games-panel--framed .games-list {
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 0;
}

.games-panel--collapsed {
  display: none;
}

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

.online-panel .account-footnote,
.online-panel .account-panel__row,
.games-panel .account-footnote,
.games-panel .account-panel__row {
  margin: 0;
}

/* ── Invite code + username flows ────────────────────────────────────── */

.invite-code-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.invite-code-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px 8px;
  border: 1px solid rgba(101, 67, 33, 0.12);
  border-radius: 10px;
  background: rgba(255, 253, 246, 0.7);
}

.invite-code-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-brown-muted);
  margin: 0;
}

.invite-code-value {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-brown-deep);
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}

.invite-code-value--empty {
  color: var(--color-brown-muted);
  opacity: 0.4;
  letter-spacing: 0.35em;
}

.account-input--code {
  text-align: center;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  width: 100%;
  max-width: 110px;
  padding: 7px 8px;
  border-radius: 8px;
}

.account-btn--small {
  font-size: 0.72rem;
  padding: 5px 14px;
  border-radius: 8px;
}

.invite-code-section .account-btn--small {
  --account-btn-bg: var(--menu-button-active);
  --account-btn-hover-bg: var(--menu-button-active-strong);
  border: none;
  font-weight: 600;
  color: var(--color-brown-deep);
}

.online-connecting-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 0;
}

.online-connecting-spinner svg {
  width: 24px;
  height: 24px;
  color: var(--color-brown-muted);
  opacity: 0.7;
}

.online-connecting-spinner p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-brown-muted);
  font-weight: 500;
}

.invite-method-tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  border-radius: 8px;
  background: var(--menu-panel-highlight);
}

.invite-pane {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.invite-pane--hidden {
  display: none;
}

.invite-username-body {
  position: relative;
}

.invite-results-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 5;
  max-height: calc(var(--games-list-row-height) * 4);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
  border-radius: 10px;
  background: var(--surface-panel-card-bright);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(101, 67, 33, 0.22);
}

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

.invite-handle-selected {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  padding: 8px 8px 8px 12px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: #fffaf2;
  color: var(--color-brown-deep);
  font-size: 14px;
  min-height: 40px;
}

.invite-handle-selected[hidden] {
  display: none;
}

.invite-handle-selected__label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.invite-handle-selected__name {
  font-weight: 700;
}

.invite-handle-selected__name::before {
  content: "@";
}

.invite-handle-edit {
  flex: 0 0 auto;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: transparent;
  color: var(--color-brown-strong);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.invite-handle-edit:hover {
  background: var(--menu-button-hover);
}

.invite-handle-search[hidden] {
  display: none;
}

/* ── Scroll lists used inside the menu ───────────────────────────────── */

.online-scroll-list {
  height: auto;
  max-height: clamp(160px, 40vh, 280px);
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
  flex-wrap: nowrap;
  width: 100%;
}

.games-list {
  margin: 0;
  min-height: 0;
  height: auto;
  max-height: calc(var(--games-list-row-height) * 4);
  overflow-y: auto;
  overflow-x: hidden;
  width: 100%;
}

/* ── Shared pill-tab button (mode / lang / invite-method / stats-hub) ── */

.mode-btn,
.lang-btn,
.invite-method-tab,
.stats-hub-tab {
  flex: 1;
  padding: var(--menu-btn-padding);
  border: none;
  border-radius: var(--menu-btn-radius);
  background: transparent;
  color: var(--menu-btn-color);
  font-size: var(--menu-btn-font-size);
  font-weight: var(--menu-btn-font-weight);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.mode-btn--active,
.lang-btn--active,
.invite-method-tab--active,
.stats-hub-tab--active {
  background: var(--menu-button-active);
  color: var(--color-brown-dark);
}

.mode-btn:not(.mode-btn--active):hover,
.lang-btn:not(.lang-btn--active):hover,
.invite-method-tab:not(.invite-method-tab--active):hover,
.stats-hub-tab:not(.stats-hub-tab--active):hover {
  background: var(--menu-button-hover);
}

.menu-tab-btn {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 14px 6px;
  border: none;
  border-radius: 0 6px 6px 0;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  background: #d7c3aa;
  color: var(--color-brown-muted);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
  position: relative;
  margin-bottom: 2px;
}

.menu-tab-btn:last-child {
  margin-bottom: 0;
}

.menu-tab-btn:hover {
  background: #cbb69e;
  color: var(--color-brown-dark);
}

.mode-btn--disabled,
.mode-btn--disabled:hover {
  background: transparent;
  opacity: 0.45;
  cursor: not-allowed;
}

.mode-btn--shake {
  animation: btn-shake 0.4s ease;
}

@keyframes btn-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* Inline error message inserted below a button row within a menu section */
.btn-error-msg {
  margin: 0;
  padding: 0 4px;
  font-size: 0.75rem;
  line-height: 1.35;
  font-weight: 600;
  color: #9a3030;
  overflow: hidden;
  transition: opacity 0.2s ease, max-height 0.25s ease;
  max-height: 40px;
  opacity: 1;
}

.btn-error-msg--out {
  max-height: 0;
  opacity: 0;
}

.piece-select-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
  height: 36px;
}

.player-color-buttons {
  padding-top: 4px;
  gap: 4px;
}

.piece-icon {
  height: 100%;
  width: auto;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,0.2));
  -webkit-filter: drop-shadow(0 2px 3px rgba(0,0,0,0.2));
  transform: translateZ(0);
  backface-visibility: hidden;
  will-change: transform, filter;
  transition: transform 0.2s ease;
}

.piece-select-btn:hover .piece-icon {
  transform: scale(1.1);
}

/* ── Difficulty control ──────────────────────────────────────────────── */

.difficulty-control__row {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--menu-panel-highlight-strong);
  border-radius: 8px;
  padding: 3px 6px;
}

.difficulty-control--compact {
  width: 100%;
}

.difficulty-btn {
  width: 30px;
  height: 30px;
  border: none;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--color-brown-strong);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
  flex-shrink: 0;
}

.difficulty-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.66);
}

.difficulty-btn:focus-visible,
.difficulty-btn:active {
  background: var(--menu-button-active-strong);
}

.difficulty-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.difficulty-btn svg {
  width: 14px;
  height: 14px;
}

.difficulty-control__value {
  flex: 0 0 auto;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-brown-strong);
  min-width: 58px;
  line-height: 1;
}

#ai-difficulty {
  flex: 1 1 auto;
  width: auto;
  min-width: 80px;
  margin-top: 0;
  accent-color: #c69b5a;
}

/* ── Active-state variants: stronger colors + menu-tab overrides ─────── */

.menu-tab-btn.menu-tab-btn--active {
  background: var(--surface-panel-card-bright);
  color: var(--color-brown-dark);
  box-shadow: none;
  z-index: 1;
  font-weight: 800;
}

.menu-tab-btn.menu-tab-btn--active:hover {
  background: var(--surface-panel-card-bright);
  color: var(--color-brown-dark);
}

.mode-btn--active:hover,
.lang-btn--active:hover {
  background: var(--menu-button-active-strong);
  color: var(--color-brown-dark);
}

.mode-btn--active:focus,
.mode-btn--active:focus-visible,
.mode-btn--active:active,
.lang-btn--active:focus,
.lang-btn--active:focus-visible,
.lang-btn--active:active {
  background: var(--menu-button-active-strong);
  color: var(--color-brown-dark);
}

/* ── AI loading overlay (inside the board) ───────────────────────────── */

.ai-loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--surface-panel-card);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  z-index: 10;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.ai-loading-overlay.ai-loading-overlay--hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.ai-loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  text-align: center;
}

.ai-loading-spinner svg {
  width: 40px;
  height: 40px;
  color: var(--color-brown-strong);
  animation: spin 1s linear infinite;
}

.ai-loading-spinner p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-brown-strong);
  font-weight: 600;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ai-loading-progress {
  font-size: 0.9rem;
}

/* ── Mobile layout tweaks ────────────────────────────────────────────── */

@media (max-width: 640px) {
  .mode-selector {
    top: 10px;
    right: 12px;
  }

  .menu-panels {
    width: calc(100vw - 48px);
    max-height: calc(var(--visual-viewport-height, 100vh) + var(--visual-viewport-offset-top, 0px) - 10px - 10px);
  }

  .mode-btn {
    font-size: 0.85rem;
    padding: 8px 12px;
  }
}