:root {
  --share-bg: #f5f5f7;
  --share-surface: #ffffff;
  --share-surface-muted: #f0f1f3;
  --share-ink: #1d1d1f;
  --share-ink-secondary: #5c5c63;
  --share-border: #dedee2;
  --share-accent: #006edb;
  --share-accent-strong: #0058b2;
  --share-gold: #d68b08;
  --share-success: #19743a;
  --share-success-bg: #e9f6ed;
  --share-error-bg: #f0f1f3;
  --share-radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--share-bg);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--share-bg);
  color: var(--share-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
}

button,
textarea {
  font: inherit;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 10px;
  background: #e7e8eb;
  color: var(--share-ink);
  cursor: pointer;
  font-weight: 700;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

button:hover:not(:disabled) {
  background: #d9dbe0;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

button:focus-visible,
textarea:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 3px solid rgba(0, 110, 219, 0.4);
  outline-offset: 3px;
}

.share-app {
  width: min(1160px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px 24px 36px;
}

.share-brand {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  color: var(--share-ink);
  font-size: 0.95rem;
  font-weight: 800;
}

.share-brand-mark {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: var(--share-ink);
  color: var(--share-gold);
  font-size: 1.25rem;
}

.share-brand-separator,
.share-brand-context {
  color: var(--share-ink-secondary);
  font-weight: 650;
}

.loading-state {
  display: grid;
  width: min(900px, 100%);
  margin: 7vh auto 0;
  grid-template-columns: minmax(240px, 1fr) minmax(220px, 0.7fr);
  gap: 24px;
  align-items: center;
}

.loading-state p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--share-ink-secondary);
  text-align: center;
}

.loading-board {
  aspect-ratio: 1;
  border-radius: var(--share-radius);
  background: #e4e5e8;
  animation: share-pulse 1.2s ease-in-out infinite alternate;
}

.loading-lines {
  display: grid;
  gap: 14px;
}

.loading-lines span {
  display: block;
  height: 46px;
  border-radius: 10px;
  background: #e4e5e8;
  animation: share-pulse 1.2s ease-in-out infinite alternate;
}

.loading-lines span:nth-child(2) {
  width: 82%;
}

.loading-lines span:nth-child(3) {
  width: 64%;
}

@keyframes share-pulse {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

.unavailable-state {
  width: min(540px, 100%);
  margin: 12vh auto 0;
  padding: 42px 30px;
  border-radius: var(--share-radius);
  background: var(--share-error-bg);
  text-align: center;
}

.unavailable-icon {
  display: inline-flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--share-surface);
  color: var(--share-ink-secondary);
  font-size: 1.7rem;
}

.unavailable-state h1 {
  margin: 18px 0 8px;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.unavailable-state p {
  max-width: 38ch;
  margin: 0 auto;
  color: var(--share-ink-secondary);
}

.replay-view {
  padding-top: 8px;
}

.game-summary {
  margin-bottom: 18px;
  padding: 18px 20px;
  border: 1px solid var(--share-border);
  border-radius: var(--share-radius);
  background: var(--share-surface);
}

.game-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.game-context {
  margin: 0 0 3px;
  color: var(--share-ink-secondary);
  font-size: 0.84rem;
  font-weight: 650;
}

.game-heading h1 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.confirmed-badge {
  display: flex;
  min-height: 44px;
  flex-direction: column;
  justify-content: center;
  padding: 6px 11px;
  border-radius: 10px;
  background: var(--share-success-bg);
  color: var(--share-success);
  font-size: 0.78rem;
  font-weight: 750;
  text-align: right;
}

.confirmed-badge time {
  color: #2f6842;
  font-size: 0.72rem;
  font-weight: 600;
}

.players {
  display: grid;
  margin-top: 18px;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
}

.player {
  display: grid;
  min-width: 0;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 8px;
  align-items: center;
}

.player-black {
  text-align: right;
  grid-template-columns: minmax(0, 1fr) 22px;
}

/* Loading and error panels must disappear when the confirmed replay is ready. */
#loadingState[hidden], #unavailableState[hidden], #replayView[hidden] {
  display: none !important;
}

.player-black .piece-dot {
  grid-column: 2;
  grid-row: 1 / 3;
  justify-self: end;
}

.player-black .player-label,
.player-black strong {
  grid-column: 1;
}

.piece-dot {
  display: block;
  width: 18px;
  height: 18px;
  grid-row: 1 / 3;
  border-radius: 50%;
}

.piece-dot-white {
  border: 1px solid #a9a9ad;
  background: #ffffff;
}

.piece-dot-black {
  background: #27272a;
}

.player-label,
.game-result span {
  color: var(--share-ink-secondary);
  font-size: 0.74rem;
  font-weight: 650;
}

.player strong {
  overflow: hidden;
  font-size: 1rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.game-result {
  min-width: 74px;
  text-align: center;
}

.game-result strong {
  display: block;
  font-size: 1.05rem;
}

.metadata-list {
  display: flex;
  margin: 16px 0 0;
  padding-top: 13px;
  border-top: 1px solid var(--share-border);
  flex-wrap: wrap;
  gap: 8px 20px;
}

.metadata-item {
  display: flex;
  gap: 6px;
  font-size: 0.8rem;
}

.metadata-item dt {
  color: var(--share-ink-secondary);
}

.metadata-item dd {
  margin: 0;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.replay-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(300px, 0.72fr);
  gap: 18px;
  align-items: start;
}

.board-panel,
.move-panel {
  min-width: 0;
  border: 1px solid var(--share-border);
  border-radius: var(--share-radius);
  background: var(--share-surface);
}

.board-panel {
  padding: 14px;
}

.board-frame {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
}

.game-board {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
}

.keyboard-hint {
  margin: 10px 0 0;
  color: var(--share-ink-secondary);
  font-size: 0.75rem;
  text-align: center;
}

.move-panel {
  overflow: hidden;
}

.position-status {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--share-border);
  background: var(--share-surface-muted);
}

.position-status strong {
  font-size: 0.94rem;
}

.position-status span {
  color: var(--share-ink-secondary);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.move-pane {
  max-height: min(52vh, 500px);
  min-height: 230px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.moves-list {
  padding: 8px;
}

.move-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) minmax(0, 1fr);
  align-items: stretch;
  gap: 4px;
}

.move-number {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--share-ink-secondary);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.move-button,
.move-placeholder {
  min-height: 44px;
  margin: 2px 0;
}

.move-button {
  padding: 7px 9px;
  background: transparent;
  color: var(--share-ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.86rem;
  text-align: left;
}

.move-button:hover:not(:disabled) {
  background: #eceef1;
}

.move-button[aria-current="step"] {
  background: var(--share-accent);
  color: #ffffff;
  text-align: center;
}

.navigation-controls {
  display: grid;
  padding: 10px 12px 6px;
  grid-template-columns: repeat(4, minmax(44px, 1fr));
  gap: 7px;
  border-top: 1px solid var(--share-border);
}

.navigation-controls button {
  font-size: 1.15rem;
}

.navigation-label {
  display: none;
}

.replay-tools summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  color: var(--share-ink-secondary);
  font-size: 0.8rem;
  font-weight: 650;
}

.replay-tools summary::-webkit-details-marker {
  display: none;
}

.replay-tools summary:focus-visible {
  outline: 3px solid rgba(0, 110, 219, 0.4);
  outline-offset: -3px;
}

.replay-tools[open] .tools-chevron {
  transform: rotate(180deg);
}

.replay-tools-content {
  max-height: min(50svh, 420px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.replay-actions {
  display: grid;
  padding: 6px 12px 12px;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 7px;
}

.primary-action {
  background: var(--share-accent);
  color: #ffffff;
}

.primary-action:hover:not(:disabled) {
  background: var(--share-accent-strong);
}

.copy-status {
  min-height: 22px;
  margin: 0;
  padding: 0 14px 10px;
  color: var(--share-success);
  font-size: 0.78rem;
  font-weight: 650;
}

.copy-fallback {
  position: fixed;
  left: -10000px;
  width: 1px;
  height: 1px;
  padding: 0;
  border: 0;
  opacity: 0;
}

.manual-copy {
  margin: 0 12px 12px;
  padding: 12px;
  border-radius: 10px;
  background: var(--share-surface-muted);
}

.manual-copy p {
  margin: 0 0 8px;
  color: var(--share-ink-secondary);
  font-size: 0.8rem;
}

.manual-copy textarea {
  width: 100%;
  min-height: 150px;
  resize: vertical;
  border: 1px solid #b8bac0;
  border-radius: 8px;
  background: var(--share-surface);
  color: var(--share-ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.55;
}

@media (max-width: 760px) and (orientation: portrait) {
  .share-app {
    padding: max(8px, env(safe-area-inset-top)) 10px calc(124px + env(safe-area-inset-bottom));
  }

  .share-brand {
    min-height: 36px;
    font-size: 0.82rem;
  }

  .share-brand-mark {
    width: 28px;
    height: 28px;
  }

  .replay-view {
    padding-top: 4px;
  }

  .loading-state {
    grid-template-columns: 1fr;
  }

  .game-summary {
    max-height: 168px;
    margin-bottom: 8px;
    padding: 10px 12px;
    overflow-y: auto;
  }

  .game-heading {
    gap: 8px;
  }

  .game-heading > div:first-child {
    min-width: 0;
  }

  .game-heading h1 {
    display: -webkit-box;
    overflow: hidden;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    font-size: 1rem;
    line-height: 1.3;
  }

  .game-context {
    display: none;
  }

  .confirmed-badge {
    min-height: 32px;
    padding: 3px 6px;
    flex-shrink: 0;
    font-size: 0.65rem;
  }

  .confirmed-badge time {
    font-size: 0.6rem;
  }

  .players {
    margin-top: 8px;
    gap: 8px;
  }

  .player strong {
    font-size: 0.9rem;
  }

  .game-result {
    min-width: 58px;
  }

  .metadata-list {
    max-height: 56px;
    margin-top: 8px;
    padding-top: 6px;
    gap: 4px 12px;
    overflow-y: auto;
  }

  .metadata-item {
    font-size: 0.72rem;
  }

  .replay-layout {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .board-panel {
    padding: 6px;
  }

  .board-frame {
    max-width: min(100%, calc(100svh - 460px));
  }

  .keyboard-hint {
    display: none;
  }

  .move-pane {
    min-height: 0;
    height: clamp(64px, 10svh, 96px);
    max-height: 96px;
  }

  .position-status {
    min-height: 38px;
    padding: 7px 12px;
  }

  .replay-controls {
    position: fixed;
    z-index: 20;
    right: 0;
    bottom: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    padding: 0 8px max(8px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--share-border);
    background: var(--share-surface);
    box-shadow: 0 -4px 18px #0000000d;
  }

  .replay-tools {
    order: -1;
  }

  .navigation-controls {
    padding: 0;
    border: 0;
    gap: 8px;
  }

  .navigation-controls button {
    display: flex;
    min-height: 64px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 2px;
    font-size: 1.45rem;
  }

  .navigation-label {
    display: block;
    font-size: 0.72rem;
  }
}

@media (max-width: 960px) and (max-height: 540px) and (orientation: landscape) {
  .share-app {
    padding: max(8px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-right)) 12px max(10px, env(safe-area-inset-left));
  }

  .share-brand,
  .game-context,
  .confirmed-badge,
  .keyboard-hint {
    display: none;
  }

  .replay-view {
    padding-top: 0;
  }

  .game-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px 16px;
    margin-bottom: 8px;
    padding: 6px 10px;
  }

  .game-heading h1 {
    max-width: 38vw;
    overflow: hidden;
    font-size: 0.85rem;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .players {
    grid-row: 1 / 3;
    grid-column: 2;
    margin-top: 0;
    gap: 8px;
  }

  .player strong {
    font-size: 0.82rem;
  }

  .metadata-list {
    min-height: 19px;
    max-height: 22px;
    margin: 0;
    padding: 0;
    border: 0;
    gap: 4px 10px;
    overflow-y: auto;
  }

  .metadata-item {
    font-size: 0.7rem;
  }

  .replay-layout {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
    gap: 12px;
  }

  .board-panel {
    padding: 6px;
  }

  .board-frame {
    max-width: min(100%, calc(100svh - 106px));
  }

  .position-status {
    min-height: 38px;
    padding: 7px 12px;
  }

  .move-pane {
    min-height: 0;
    height: calc(100svh - 232px);
    max-height: calc(100svh - 232px);
  }

  .replay-controls {
    position: fixed;
    z-index: 20;
    right: max(10px, env(safe-area-inset-right));
    bottom: max(8px, env(safe-area-inset-bottom));
    left: calc(44.444% + 7px);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--share-border);
    border-radius: var(--share-radius);
    background: var(--share-surface);
  }

  .replay-tools {
    order: -1;
  }

  .replay-tools summary {
    min-height: 38px;
  }

  .navigation-controls {
    padding: 0 8px 8px;
    border: 0;
  }

  .navigation-controls button {
    min-height: 56px;
    font-size: 1.4rem;
  }
}

@media (max-width: 430px) {
  .replay-actions {
    grid-template-columns: 1fr 1fr;
  }

  .primary-action {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}