/* =============================================================
 * improvements.css — v1.6 の検討・学習・通信品質 UI
 * 固定幅スマートフォンフレームの寸法は style.css に委ねる。
 * ============================================================= */

:root {
  --text-dim: #beb3a3;
  --analysis-best: #67c58c;
  --analysis-good: #89b6d9;
  --analysis-inaccuracy: #dfb35d;
  --analysis-mistake: #df875d;
  --analysis-blunder: #e36d62;
}

.hint,
.rule-text,
.sheet-sub {
  font-size: max(.81rem, 12px);
  line-height: 1.62;
}

.network-assurance {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 1px 10px;
  padding: 8px 10px;
  border: 1px solid rgba(104, 199, 138, .24);
  border-radius: 10px;
  color: #cbd6ca;
  background: linear-gradient(135deg, rgba(39, 72, 50, .28), rgba(25, 30, 26, .65));
  font-size: .76rem;
  line-height: 1.35;
}

.network-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--text-dim);
  box-shadow: 0 0 0 4px rgba(174, 164, 150, .09);
}

.network-assurance[data-quality='good'] .network-dot {
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(104, 199, 138, .13);
}

.network-assurance[data-quality='fair'] .network-dot {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(225, 173, 80, .13);
}

.network-assurance[data-quality='poor'] .network-dot,
.network-assurance[data-quality='offline'] .network-dot {
  background: var(--danger);
  box-shadow: 0 0 0 4px rgba(227, 109, 98, .13);
}

.badge.quality-good { background: #1e4a30; color: #b4edc6; }
.badge.quality-fair { background: #51421f; color: #f5d18b; }
.badge.quality-poor { background: #552a25; color: #ffc1b7; }

.record-insights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 11px;
}

.record-insight {
  min-width: 0;
  padding: 8px 9px;
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  background: rgba(255, 255, 255, .025);
}

.record-insight span {
  display: block;
  color: var(--text-dim);
  font-size: .66rem;
}

.record-insight b {
  display: block;
  margin-top: 3px;
  overflow: hidden;
  color: #f2d7a2;
  font-size: .86rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-search {
  display: grid;
  gap: 5px;
  margin-top: 9px;
  color: var(--text-dim);
  font-size: .72rem;
}

.history-search .control { min-height: 42px; }

.history-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin: -3px 0 11px;
}

.history-tools .btn {
  min-width: 0;
  min-height: 40px;
  padding: 7px;
  font-size: .68rem;
}

.history-item {
  position: relative;
  margin-bottom: 6px;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 9px;
  background: rgba(255, 255, 255, .025);
}

.history-item.pinned {
  border-color: rgba(225, 173, 80, .36);
  background: rgba(225, 173, 80, .055);
}

.history-item .history-entry {
  border-radius: 0;
  padding-inline-end: 7px;
}

.history-item .history-meta-line {
  display: block;
  margin-top: 2px;
  color: var(--text-dim);
  font-size: .64rem;
  font-weight: 400;
}

.history-entry .mv { white-space: normal; }

.history-actions {
  display: flex;
  justify-content: flex-end;
  gap: 3px;
  padding: 0 5px 5px;
}

.history-actions button {
  min-width: 34px;
  min-height: 32px;
  padding: 3px 7px;
  border: 0;
  border-radius: 7px;
  color: var(--text-dim);
  background: transparent;
  font: inherit;
  font-size: .65rem;
}

.history-actions button:hover,
.history-actions button:focus-visible {
  color: var(--text);
  background: rgba(255, 255, 255, .07);
}

.history-actions .danger:hover,
.history-actions .danger:focus-visible { color: #ffb4aa; }

.analysis-strip {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 7px;
  align-items: center;
  min-height: 42px;
  padding: 7px 9px;
  border: 1px solid rgba(225, 173, 80, .34);
  border-radius: 9px;
  background: linear-gradient(135deg, rgba(59, 48, 30, .88), rgba(24, 22, 18, .95));
}

.analysis-strip[hidden] { display: none; }
.analysis-grade {
  padding: 3px 7px;
  border-radius: 999px;
  color: #111;
  background: var(--analysis-good);
  font-size: .68rem;
  font-weight: 800;
}
.analysis-grade[data-grade='best'] { background: var(--analysis-best); }
.analysis-grade[data-grade='inaccuracy'] { background: var(--analysis-inaccuracy); }
.analysis-grade[data-grade='mistake'] { background: var(--analysis-mistake); }
.analysis-grade[data-grade='blunder'] { background: var(--analysis-blunder); color: #fff; }
.analysis-evaluation {
  color: #f4d99f;
  font-size: .74rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}
.analysis-advice {
  min-width: 0;
  overflow: hidden;
  color: #ddd2c3;
  font-size: .67rem;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.review-controls .review-analyze {
  grid-column: 1 / 4;
  min-height: 36px;
}

.review-controls .review-close {
  grid-column: 4 / -1;
}

.analysis-sheet { overflow: hidden; }

.analysis-progress {
  height: 7px;
  margin: 12px 0 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
}

.analysis-progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-2), #efd083);
  transition: width .25s ease;
}

.analysis-report {
  max-height: min(460px, calc(var(--app-h) * .56));
  overflow-y: auto;
}

.analysis-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.analysis-summary-item {
  padding: 8px 5px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(255, 255, 255, .025);
  text-align: center;
}
.analysis-summary-item b { display: block; color: #f1d59e; font-size: 1rem; }
.analysis-summary-item span { color: var(--text-dim); font-size: .61rem; }

.analysis-chart {
  display: block;
  width: 100%;
  height: 104px;
  margin: 12px 0;
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  background: rgba(6, 6, 5, .38);
}

.analysis-key-moves {
  display: grid;
  gap: 5px;
}

.analysis-key-move {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 7px;
  align-items: center;
  min-height: 42px;
  padding: 7px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  color: var(--text);
  background: rgba(255, 255, 255, .025);
  text-align: start;
  font: inherit;
}
.analysis-key-move .ply { color: var(--text-dim); font-size: .67rem; }
.analysis-key-move .grade { color: #efbd80; font-size: .68rem; font-weight: 800; }
.analysis-key-move .detail { min-width: 0; font-size: .7rem; }

.rule-movement-lab { overflow: hidden; }
.rule-piece-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  margin: 9px 0;
}
.rule-piece-tabs button {
  min-width: 0;
  min-height: 44px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--text);
  background: var(--panel-2);
  font: inherit;
  font-size: .7rem;
  line-height: 1.25;
  overflow-wrap: anywhere;
}
.rule-piece-tabs button[aria-pressed='true'] {
  border-color: var(--accent);
  color: #ffe1a4;
  background: var(--accent-soft);
}
.rule-promotion-panel {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 7px 10px;
  align-items: center;
  margin: 4px 0 9px;
  padding: 8px 9px;
  border: 1px solid rgba(225, 173, 80, .24);
  border-radius: 9px;
  background:
    linear-gradient(135deg, rgba(225, 173, 80, .07), transparent 58%),
    rgba(5, 5, 4, .25);
}
.rule-promotion-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 112px;
}
.rule-promotion-piece {
  display: grid;
  grid-template-rows: 39px auto;
  justify-items: center;
  width: 43px;
  padding: 3px 3px 4px;
  border: 1px solid transparent;
  border-radius: 7px;
  opacity: .58;
  transition: border-color .18s ease, background-color .18s ease, opacity .18s ease;
}
.rule-promotion-piece.active {
  border-color: rgba(225, 173, 80, .52);
  background: rgba(225, 173, 80, .1);
  opacity: 1;
}
.rule-promotion-piece .koma {
  width: 31px;
  height: 36px;
  font-size: 15px;
}
.rule-promotion-piece > span {
  margin-top: 2px;
  color: var(--text-dim);
  font-size: .56rem;
  line-height: 1;
  white-space: nowrap;
}
.rule-promotion-arrow {
  width: 19px;
  height: 14px;
  overflow: visible;
  color: var(--accent);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.rule-promotion-state {
  min-width: 0;
}
.rule-promotion-state button {
  min-height: 36px;
  padding: 5px 4px;
  font-size: .66rem;
}
.rule-promotion-description {
  grid-column: 1 / -1;
  min-height: 1.35em;
  margin: 0;
  color: #d9c9af;
  font-size: .67rem;
  line-height: 1.42;
  text-align: center;
}
.rule-promotion-panel.cannot-promote {
  grid-template-columns: 52px 1fr;
}
.rule-promotion-panel.cannot-promote .rule-promotion-preview {
  min-width: 43px;
}
.rule-promotion-panel.cannot-promote .rule-promotion-state {
  display: none;
}
.rule-promotion-panel.cannot-promote .rule-promotion-description {
  grid-column: 2;
  text-align: start;
}
.rule-direction { margin-bottom: 9px; }
.rule-mini-board {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  width: min(250px, 82%);
  margin: 0 auto;
  border-top: 1px solid #44260e;
  border-left: 1px solid #44260e;
  background: #be8043;
  box-shadow: inset 0 0 18px rgba(76, 35, 9, .18);
}
.rule-mini-cell {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-width: 0;
  padding: 3px;
  border: 0;
  border-right: 1px solid #44260e;
  border-bottom: 1px solid #44260e;
  background: transparent;
}
.rule-mini-cell .koma { width: 80%; height: 88%; font-size: 17px; }
.rule-mini-board[data-promoted='true'] .rule-mini-cell.origin .koma {
  animation: rule-piece-reveal .24s ease-out;
}
.rule-mini-cell.target {
  cursor: pointer;
}
.rule-mini-cell.target::after {
  content: '';
  width: 11px;
  height: 11px;
  border: 2px solid rgba(37, 87, 50, .85);
  border-radius: 50%;
  background: rgba(105, 203, 133, .62);
  box-shadow: 0 0 0 4px rgba(105, 203, 133, .16);
}
.rule-mini-cell.target.confirmed::after {
  animation: rule-confirm .35s ease-out;
}
.rule-demo-status {
  min-height: 2.6em;
  margin: 9px 0 0;
  color: #d8c7ad;
  font-size: .72rem;
  line-height: 1.45;
  text-align: center;
}

.history-kifu-sheet #history-kifu-analyze {
  grid-column: 1 / -1;
}

.result-actions #result-analyze {
  grid-column: 1 / -1;
  border-color: rgba(225, 173, 80, .5);
}

html[dir='rtl'] .analysis-key-move,
html[dir='rtl'] .history-search { text-align: right; }

@keyframes rule-confirm {
  0% { transform: scale(.5); opacity: .3; }
  70% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(1); }
}

@keyframes rule-piece-reveal {
  from { transform: rotate(var(--piece-rotation, 0deg)) scale(.86); opacity: .35; }
  to { transform: rotate(var(--piece-rotation, 0deg)) scale(1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .analysis-progress span { transition: none; }
  .rule-mini-cell.target.confirmed::after { animation: none; }
  .rule-promotion-piece { transition: none; }
  .rule-mini-board[data-promoted='true'] .rule-mini-cell.origin .koma { animation: none; }
}

/* =============================================================
 * 外観 — 生成りの和紙を基調にしたライトテーマ
 * 盤・駒の素材色は変えず、周囲のUIだけを切り替える。
 * ============================================================= */

html[data-appearance='light'] {
  color-scheme: light;
  --bg: #eee5d6;
  --bg-soft: #e4d8c5;
  --panel: rgba(251, 247, 239, .97);
  --panel-2: #eadfcd;
  --line: #ab987c;
  --line-soft: rgba(94, 68, 39, .18);
  --text: #2b2219;
  --text-dim: #675b4c;
  --accent: #9a6428;
  --accent-2: #7d491a;
  --accent-soft: rgba(154, 100, 40, .13);
  --danger: #a44139;
  --ok: #316e48;
  --info: #365f7c;
  --scrollbar-track: rgba(111, 83, 50, .13);
  --scrollbar-thumb: #9c7545;
  --scrollbar-thumb-highlight: #bd945d;
  --scrollbar-thumb-active: #80562a;
  --analysis-best: #32704a;
  --analysis-inaccuracy: #9a6b20;
  --analysis-mistake: #ac5a26;
  --analysis-blunder: #9f3f39;
}

html[data-appearance='light'] #device {
  background-color: var(--bg);
  background-image:
    linear-gradient(90deg, rgba(123, 83, 39, .055) 0, transparent 18%, transparent 82%, rgba(123, 83, 39, .035) 100%),
    linear-gradient(rgba(246, 240, 229, .92), rgba(238, 229, 214, .95)),
    url('../assets/washi-dark.jpg');
}

html[data-appearance='light'] #device::before {
  border-color: rgba(112, 80, 43, .36);
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .58),
    inset 0 0 30px rgba(90, 60, 27, .06);
}

@media (min-width: 501px) and (hover: hover) and (pointer: fine) {
  html[data-appearance='light'] #device {
    box-shadow:
      0 0 0 7px #15120e,
      0 0 0 8px #655743,
      0 0 0 9px rgba(219, 182, 125, .28),
      0 34px 78px rgba(0, 0, 0, .65),
      0 5px 16px rgba(0, 0, 0, .48),
      inset 0 1px rgba(255, 255, 255, .5);
  }
}

html[data-appearance='light'] .screen:not(#screen-game) {
  background-image:
    linear-gradient(90deg, transparent 0 8px, rgba(139, 91, 36, .16) 8px 9px, transparent 9px),
    linear-gradient(90deg, rgba(255, 255, 255, .16), transparent 36%);
}

html[data-appearance='light'] .title-bar {
  border-bottom-color: rgba(126, 83, 35, .32);
}

html[data-appearance='light'] :focus-visible {
  outline-color: #80521f;
}

html[data-appearance='light'] .btn {
  border-color: #b29d80;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 252, 245, .98), rgba(230, 219, 201, .98));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .8),
    0 2px 7px rgba(71, 48, 24, .12);
}

@media (hover: hover) and (pointer: fine) {
  html[data-appearance='light'] .btn:hover:not(:disabled) {
    border-color: #927653;
    background: linear-gradient(180deg, #fffdf7, #e8dcc8);
    box-shadow:
      inset 0 1px #fff,
      0 4px 10px rgba(71, 48, 24, .16);
  }
}

html[data-appearance='light'] .btn.primary {
  border-color: #aa702d;
  color: #211608;
  background: linear-gradient(180deg, #edc77f 0%, #dba454 55%, #bd792d 100%);
  box-shadow:
    inset 0 1px rgba(255, 250, 226, .7),
    inset 0 -1px rgba(74, 37, 7, .2),
    0 5px 12px rgba(100, 60, 18, .2);
}

html[data-appearance='light'] .btn.ghost,
html[data-appearance='light'] .btn.icon {
  background: rgba(250, 245, 235, .7);
}

html[data-appearance='light'] .btn.danger {
  border-color: rgba(151, 61, 52, .55);
  color: #8c352f;
  background: rgba(170, 66, 57, .08);
}

html[data-appearance='light'] .card {
  border-color: rgba(112, 80, 43, .28);
  background: linear-gradient(145deg, rgba(255, 252, 245, .94), rgba(239, 231, 216, .96));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .7),
    0 8px 20px rgba(75, 51, 25, .08);
}

html[data-appearance='light'] .card h3 {
  color: #82521f;
}

html[data-appearance='light'] .control {
  border-color: rgba(122, 83, 39, .42);
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 253, 247, .98), rgba(235, 225, 208, .98));
  box-shadow:
    inset 0 1px 4px rgba(83, 57, 29, .1),
    0 1px rgba(255, 255, 255, .7);
}

html[data-appearance='light'] .control:focus {
  border-color: #8f5d25;
  box-shadow:
    inset 0 1px 4px rgba(83, 57, 29, .08),
    0 0 0 2px rgba(143, 93, 37, .14);
}

html[data-appearance='light'] select.control {
  color-scheme: light;
}

html[data-appearance='light'] select.control option,
html[data-appearance='light'] select.control optgroup {
  color: #2b2219;
  background-color: #f7f0e5;
}

html[data-appearance='light'] select.control option:checked {
  color: #211608;
  background-color: #d8a150;
}

html[data-appearance='light'] select.control option:disabled {
  color: #817461;
  background-color: #eee4d5;
}

html[data-appearance='light'] .seg {
  border-color: rgba(116, 79, 37, .36);
  background: #dfd1bb;
  box-shadow: inset 0 1px 4px rgba(83, 57, 29, .13);
}

html[data-appearance='light'] .seg button {
  color: #594c3d;
}

html[data-appearance='light'] .seg button + button {
  border-inline-start-color: rgba(103, 73, 39, .16);
}

html[data-appearance='light'] .seg button[aria-pressed='true'] {
  color: #211608;
  background: linear-gradient(180deg, #f0cc84, #d8a150);
  box-shadow:
    inset 0 1px rgba(255, 251, 232, .76),
    0 1px 4px rgba(76, 46, 15, .18);
}

html[data-appearance='light'] .switch {
  border-bottom-color: rgba(101, 72, 39, .16);
}

html[data-appearance='light'] .switch .track {
  border-color: rgba(91, 68, 42, .32);
  background: #cfc1ad;
  box-shadow: inset 0 1px 3px rgba(65, 44, 22, .16);
}

html[data-appearance='light'] .switch .track::after {
  background: #fffaf1;
  box-shadow: 0 1px 3px rgba(55, 37, 18, .25);
}

html[data-appearance='light'] .switch input:checked + .track {
  border-color: #83511d;
  background: #a66a29;
}

/* ホーム */
html[data-appearance='light'] .home-hero .logo {
  color: #85551f;
  text-shadow:
    0 1px rgba(255, 255, 255, .85),
    0 3px 8px rgba(83, 52, 19, .13);
}

html[data-appearance='light'] .home-hero .sub {
  color: #6d604f;
}

html[data-appearance='light'] #screen-home > .screen-scroll > .menu-grid {
  border-color: rgba(112, 77, 37, .34);
  background: linear-gradient(145deg, rgba(255, 252, 245, .96), rgba(235, 226, 210, .96));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .74),
    8px 0 0 -7px rgba(139, 86, 32, .45),
    0 12px 24px rgba(74, 49, 23, .09);
}

html[data-appearance='light'] #screen-home .menu-item + .menu-item,
html[data-appearance='light'] .sheet .menu-item + .menu-item {
  border-top-color: rgba(109, 76, 39, .18);
}

html[data-appearance='light'] .menu-item .mi-icon {
  border-color: rgba(133, 86, 32, .4);
  color: #89561d;
  background: linear-gradient(145deg, rgba(199, 144, 72, .16), rgba(255, 255, 255, .18));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .6),
    0 2px 6px rgba(73, 48, 22, .1);
}

html[data-appearance='light'] .menu-item .mi-desc {
  color: #6b5f50;
}

html[data-appearance='light'] .menu-chevron {
  color: #81501d;
}

html[data-appearance='light'] #screen-home .card {
  border-color: rgba(110, 75, 37, .26);
}

html[data-appearance='light'] #screen-home .card h3,
html[data-appearance='light'] :is(
  #screen-ai,
  #screen-local,
  #screen-online,
  #screen-settings,
  #screen-record
) .card h3 {
  color: #82521f;
}

html[data-appearance='light'] .stat-row > div {
  border-color: rgba(108, 74, 37, .28);
  background: linear-gradient(180deg, rgba(255, 252, 245, .88), rgba(224, 212, 193, .88));
}

html[data-appearance='light'] .stat-row b {
  color: #87531d;
}

html[data-appearance='light'] #screen-home > .screen-scroll > .row .btn {
  border-color: rgba(109, 75, 37, .28);
  background: rgba(247, 240, 229, .82);
}

/* 対局。盤・駒は共通の木材表現をそのまま使う。 */
html[data-appearance='light'] .player-bar {
  border-color: rgba(117, 78, 34, .3);
  background: linear-gradient(105deg, rgba(255, 251, 242, .94), rgba(232, 221, 203, .95));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .72),
    0 2px 7px rgba(66, 43, 21, .1);
}

html[data-appearance='light'] .player-bar.turn-active {
  border-color: rgba(145, 88, 27, .78);
  background: linear-gradient(105deg, #f6e7ca, #e7d4b5);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, .48),
    0 3px 8px rgba(77, 46, 16, .13);
}

html[data-appearance='light'] .player-bar.turn-active .pb-name,
html[data-appearance='light'] .player-bar.turn-active .pb-clock,
html[data-appearance='light'] .pb-clock {
  color: #49331e;
}

html[data-appearance='light'] .pb-tag {
  background: rgba(89, 59, 29, .09);
}

html[data-appearance='light'] .hand-tray {
  border-color: rgba(116, 78, 36, .28);
  background: linear-gradient(90deg, rgba(230, 219, 202, .92), rgba(247, 241, 231, .86));
  box-shadow: inset 0 1px 5px rgba(74, 48, 22, .12);
}

html[data-appearance='light'] .hand-tray.empty::before {
  color: #766956;
}

html[data-appearance='light'] .status-strip {
  border-color: rgba(112, 76, 37, .2);
}

html[data-appearance='light'] .status-strip.selection-active,
html[data-appearance='light'] .status-strip.thinking-active,
html[data-appearance='light'] .status-strip.check-active {
  border-color: rgba(139, 85, 28, .48);
  background: linear-gradient(90deg, rgba(155, 99, 36, .1), transparent);
}

html[data-appearance='light'] .status-strip.selection-active .move-text {
  color: #633d17;
}

html[data-appearance='light'] .pb-mark {
  color: #5b4a37;
}

html[data-appearance='light'] .game-guide {
  border-color: rgba(127, 84, 35, .28);
  color: #5e4b36;
  background: rgba(156, 101, 39, .08);
}

html[data-appearance='light'] .action-bar {
  border-top-color: rgba(112, 76, 37, .24);
}

html[data-appearance='light'] .action-bar .btn {
  border-color: rgba(111, 76, 38, .3);
  color: #473b2e;
  background: linear-gradient(180deg, rgba(255, 252, 245, .96), rgba(229, 217, 197, .98));
  box-shadow:
    inset 0 1px rgba(255, 255, 255, .75),
    0 2px 7px rgba(67, 44, 21, .11);
}

html[data-appearance='light'] .action-bar .btn .icon {
  color: #665541;
}

html[data-appearance='light'] .action-bar #btn-resign,
html[data-appearance='light'] .action-bar #btn-resign .icon {
  color: #9b3e36;
}

/* シート・記録・ルール・解析 */
html[data-appearance='light'] .sheet {
  border-color: rgba(118, 79, 35, .42);
  background-color: #f2e9da;
  background-image:
    linear-gradient(rgba(249, 245, 236, .93), rgba(238, 228, 211, .97)),
    url('../assets/washi-dark.jpg');
  box-shadow:
    0 -18px 44px rgba(0, 0, 0, .34),
    inset 0 1px rgba(255, 255, 255, .72);
}

html[data-appearance='light'] .sheet::before {
  background: #a08a6d;
  box-shadow: inset 0 1px rgba(255, 255, 255, .5);
}

html[data-appearance='light'] .sheet h3 {
  border-bottom-color: rgba(111, 76, 37, .3);
  color: #33271c;
}

html[data-appearance='light'] .sheet .sheet-sub {
  color: #6d604f;
}

html[data-appearance='light'] .sheet .menu-grid {
  border-block-color: rgba(108, 75, 39, .18);
}

html[data-appearance='light'] .sheet-actions .btn {
  background: rgba(248, 242, 231, .78);
}

html[data-appearance='light'] .sheet-actions .btn.primary {
  background: linear-gradient(180deg, #edc77f, #cc8d3b);
}

html[data-appearance='light'] :is(
  .promo-choice,
  .kifu-list,
  .history-kifu-text,
  .code-display,
  .room-item,
  .history-item,
  .analysis-strip,
  .analysis-summary-item,
  .analysis-key-move
) {
  border-color: rgba(112, 77, 38, .28);
  color: var(--text);
  background-color: rgba(255, 252, 245, .7);
}

/*
 * `background-color` だけではダークテーマの和紙用グラデーションが残る。
 * 棋譜本文は背景レイヤーごと置き換え、墨色の文字を確実に読み取れるようにする。
 */
html[data-appearance='light'] :is(#kifu-list, #result-kifu) {
  color: #2b2219;
  background: rgba(255, 252, 245, .78);
}

html[data-appearance='light'] #history-kifu-text {
  color: #30261c;
  background:
    linear-gradient(rgba(255, 252, 245, .94), rgba(244, 236, 223, .96)),
    url('../assets/washi-dark.jpg');
  text-shadow: none;
}

html[data-appearance='light'] .kifu-row {
  color: #33281d;
}

html[data-appearance='light'] .kifu-row:nth-child(odd) {
  background: rgba(90, 62, 32, .035);
}

html[data-appearance='light'] .kifu-row:hover {
  background: rgba(125, 83, 35, .08);
}

html[data-appearance='light'] .kifu-row.current {
  background: rgba(176, 111, 39, .16);
}

html[data-appearance='light'] .chat-bubble {
  background: #e3d5c1;
}

html[data-appearance='light'] .chat-bubble.me {
  background: #d9bf94;
}

html[data-appearance='light'] .analysis-progress {
  background: rgba(83, 58, 31, .12);
}

html[data-appearance='light'] .analysis-summary-item b {
  color: #744515;
}

html[data-appearance='light'] .analysis-chart {
  background: rgba(255, 253, 248, .66);
}

html[data-appearance='light'] .analysis-key-move .grade {
  color: #8a5218;
}

html[data-appearance='light'] .rule-piece-tabs button[aria-pressed='true'] {
  color: #754616;
}

html[data-appearance='light'] .rule-promotion-panel {
  border-color: rgba(132, 82, 28, .25);
  background:
    linear-gradient(135deg, rgba(184, 116, 42, .1), transparent 58%),
    rgba(255, 252, 245, .52);
}

html[data-appearance='light'] .rule-promotion-description,
html[data-appearance='light'] .rule-demo-status {
  color: #5f513f;
}

html[data-appearance='light'] .rule-toc button {
  color: var(--text);
  background: rgba(248, 242, 231, .78);
}

/* ライト表示専用の状態色。淡い背景には暗い文字を組み合わせる。 */
html[data-appearance='light'] .hint.warn,
html[data-appearance='light'] .review-controls output,
html[data-appearance='light'] .result-rematch-status {
  color: #6b4318 !important;
}

html[data-appearance='light'] .field-error {
  color: #903b34;
}

html[data-appearance='light'] #screen-settings .switch:focus-within {
  color: #312419;
  background: rgba(139, 85, 28, .08);
}

html[data-appearance='light'] .badge.thinking {
  color: #21465e;
  background: #d8e6ef;
}

html[data-appearance='light'] :is(.badge.online, .badge.quality-good) {
  color: #245a38;
  background: #d9eadf;
}

html[data-appearance='light'] :is(.badge.offline, .badge.quality-poor) {
  color: #7d332d;
  background: #f0d9d6;
}

html[data-appearance='light'] :is(.badge.reconnecting, .badge.quality-fair) {
  border-color: rgba(120, 77, 24, .25);
  color: #67410f;
  background: #efdfbd;
}

html[data-appearance='light'] .status-strip.reconnecting-active {
  border-color: rgba(139, 85, 28, .42);
  background: linear-gradient(90deg, rgba(155, 99, 36, .11), transparent);
}

/* 通信・戦績・分析の補助パネルもライト面へ統一する。 */
html[data-appearance='light'] .network-assurance {
  border-color: rgba(49, 110, 72, .25);
  color: #365342;
  background: linear-gradient(135deg, rgba(218, 234, 222, .9), rgba(244, 239, 227, .92));
}

html[data-appearance='light'] .record-insight,
html[data-appearance='light'] .history-item {
  background: rgba(255, 252, 245, .62);
}

html[data-appearance='light'] .record-insight b {
  color: #704617;
}

html[data-appearance='light'] .history-item.pinned {
  border-color: rgba(151, 91, 27, .36);
  background: rgba(176, 111, 39, .1);
}

html[data-appearance='light'] .history-entry .mode-label {
  border-color: rgba(129, 79, 27, .3);
  color: #67451f;
}

html[data-appearance='light'] .history-actions button:hover,
html[data-appearance='light'] .history-actions button:focus-visible {
  color: #2b2219;
  background: rgba(112, 77, 38, .09);
}

html[data-appearance='light'] .history-actions .danger:hover,
html[data-appearance='light'] .history-actions .danger:focus-visible {
  color: #8e3730;
}

html[data-appearance='light'] .analysis-strip {
  border-color: rgba(118, 78, 34, .3);
  color: #2b2219;
  background: linear-gradient(135deg, rgba(242, 229, 208, .96), rgba(255, 252, 245, .94));
}

html[data-appearance='light'] .analysis-evaluation {
  color: #674016;
}

html[data-appearance='light'] .analysis-advice {
  color: #514639;
}

/* ルール画面の暗色テーマ専用文字を、生成りの背景向けに再定義する。 */
html[data-appearance='light'] .rules-tools {
  border-bottom-color: rgba(119, 78, 33, .3);
  background:
    linear-gradient(rgba(246, 239, 227, .97), rgba(238, 228, 211, .95)),
    url('../assets/washi-dark.jpg');
}

html[data-appearance='light'] .rules-search-label {
  color: #6e4518;
}

html[data-appearance='light'] .rule-heading {
  border-bottom-color: rgba(126, 82, 34, .3);
  background: linear-gradient(90deg, rgba(176, 111, 39, .11), transparent 66%);
}

html[data-appearance='light'] .rule-number {
  border-color: rgba(128, 78, 25, .54);
  color: #603a13;
  background: rgba(176, 111, 39, .1);
}

html[data-appearance='light'] .rule-card .rule-heading h3,
html[data-appearance='light'] .rule-term {
  color: #6c4216;
}

html[data-appearance='light'] .rule-lead {
  color: #463a2d;
}

html[data-appearance='light'] .rule-text {
  color: #5f5447;
}

html[data-appearance='light'] .rule-toc button:hover,
html[data-appearance='light'] .rule-toc button:focus-visible {
  color: #5d3710;
}

html[data-appearance='light'] .toast {
  border-color: rgba(116, 77, 34, .48);
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 252, 245, .99), rgba(231, 219, 200, .99));
  box-shadow: 0 7px 22px rgba(57, 37, 17, .24);
}

html[data-appearance='light'][data-contrast='high'] {
  --text: #17120d;
  --text-dim: #42392f;
  --line: #715b42;
  --line-soft: rgba(57, 40, 22, .28);
  --accent: #784715;
}

html[data-appearance='light'][data-contrast='high'] :is(
  .hint,
  .mi-desc,
  .rule-text,
  .sheet-sub
) {
  color: #42392f;
}

/* =============================================================
 * 対局開始前の任意寄付案内
 * バックギャモン版と同じ導線を、固定幅スマホ枠向けに再構成する。
 * ============================================================= */

.donation-backdrop {
  z-index: 70;
  align-items: center;
  padding: 12px;
  background: rgba(3, 3, 2, .82);
}

.donation-sheet {
  width: 100%;
  max-height: calc(var(--app-h) - 24px);
  padding: 12px 12px calc(var(--safe-bottom) + 12px);
  border: 1px solid rgba(214, 165, 88, .58);
  border-radius: 18px;
  overflow-y: auto;
  box-shadow:
    0 22px 52px rgba(0, 0, 0, .62),
    inset 0 1px rgba(255, 240, 207, .06);
}

.donation-sheet::before {
  display: none;
}

.donation-close {
  position: absolute;
  z-index: 2;
  top: 19px;
  right: 19px;
  min-width: 40px;
  min-height: 40px;
  padding: 4px;
  border-color: rgba(255, 248, 230, .38);
  border-radius: 999px;
  color: #fffaf0;
  background: rgba(12, 10, 8, .68);
  font-size: 1.25rem;
  line-height: 1;
  backdrop-filter: blur(8px);
}

.donation-art {
  position: relative;
  height: clamp(184px, calc(var(--app-h) * .27), 228px);
  overflow: hidden;
  border: 1px solid rgba(220, 177, 105, .55);
  border-radius: 12px;
  background: #eee3d2;
  box-shadow:
    inset 0 0 0 4px rgba(255, 250, 239, .52),
    0 7px 18px rgba(0, 0, 0, .2);
}

.donation-art::after {
  content: '';
  position: absolute;
  inset: auto 0 0;
  height: 34%;
  background: linear-gradient(transparent, rgba(24, 17, 10, .18));
  pointer-events: none;
}

.donation-art img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 43%;
}

.donation-copy {
  padding: 12px 3px 0;
}

.donation-eyebrow {
  margin: 0 0 4px;
  color: #d7a553;
  font-family: var(--font-gothic);
  font-size: .61rem;
  font-weight: 800;
  letter-spacing: .22em;
  text-align: center;
}

.donation-sheet h3 {
  margin: 0;
  padding: 0;
  border: 0;
  color: #f0e8db;
  font-size: 1.18rem;
  letter-spacing: .055em;
  line-height: 1.45;
  text-align: center;
}

.donation-description {
  margin: 8px 2px 10px;
  color: #c8bfb2;
  font-size: .75rem;
  line-height: 1.65;
  text-align: center;
}

.donation-voluntary {
  display: grid;
  gap: 3px;
  padding: 9px 10px;
  border: 1px solid rgba(218, 166, 82, .34);
  border-radius: 9px;
  color: #e7ddce;
  background: rgba(210, 153, 64, .07);
  font-size: .69rem;
  line-height: 1.48;
  text-align: center;
}

.donation-voluntary strong {
  color: #edc97f;
  font-family: var(--font-mincho);
  font-size: .75rem;
}

.donation-status {
  min-height: 1.5em;
  margin: 7px 3px 5px;
  color: #e3be73;
  font-size: .67rem;
  line-height: 1.45;
  text-align: center;
}

.donation-actions {
  display: grid;
  gap: 7px;
}

.donation-actions .btn,
.donation-footer .btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  text-decoration: none;
}

.donation-paypal {
  font-family: var(--font-mincho);
  font-weight: 800;
}

.donation-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 7px;
}

html[dir='rtl'] .donation-close {
  right: auto;
  left: 19px;
}

html[data-appearance='light'] .donation-backdrop {
  background: rgba(26, 19, 12, .68);
}

html[data-appearance='light'] .donation-sheet {
  border-color: rgba(126, 82, 34, .52);
  background:
    linear-gradient(rgba(249, 245, 236, .96), rgba(238, 228, 211, .98)),
    url('../assets/washi-dark.jpg');
  box-shadow:
    0 22px 52px rgba(39, 25, 12, .42),
    inset 0 1px rgba(255, 255, 255, .76);
}

html[data-appearance='light'] .donation-close {
  border-color: rgba(77, 51, 26, .34);
  color: #3c2c1d;
  background: rgba(255, 251, 242, .82);
}

html[data-appearance='light'] .donation-eyebrow {
  color: #80501d;
}

html[data-appearance='light'] .donation-sheet h3 {
  color: #33271c;
}

html[data-appearance='light'] .donation-description {
  color: #5e5245;
}

html[data-appearance='light'] .donation-voluntary {
  border-color: rgba(132, 82, 28, .28);
  color: #514437;
  background: rgba(176, 111, 39, .08);
}

html[data-appearance='light'] .donation-voluntary strong,
html[data-appearance='light'] .donation-status {
  color: #704416;
}

@media (max-height: 690px) {
  .donation-sheet {
    padding: 9px 10px calc(var(--safe-bottom) + 9px);
  }

  .donation-art {
    height: 158px;
  }

  .donation-copy {
    padding-top: 8px;
  }

  .donation-description {
    margin-block: 5px 7px;
    line-height: 1.5;
  }

  .donation-voluntary {
    padding-block: 6px;
  }

  .donation-status {
    margin-block: 4px 2px;
  }

  .donation-actions .btn,
  .donation-footer .btn {
    min-height: 42px;
  }
}

/* v2.1: ホームの接続状態と、対局中のAI候補手を両テーマで明瞭にする。 */
html[data-appearance='light'] .menu-item .mi-status {
  color: #6f5b42;
}

html[data-appearance='light'] .mi-status-dot {
  box-shadow: 0 0 0 2px rgba(86, 66, 43, .1);
}

html[data-appearance='light'] .game-guide-action {
  border-inline-start-color: rgba(111, 72, 30, .28);
  color: #704416;
}

html[data-appearance='light'] .cell.hint-from {
  background: radial-gradient(circle, rgba(255, 240, 192, .55), rgba(179, 115, 45, .13) 72%);
  box-shadow:
    inset 0 0 0 2px rgba(107, 61, 20, .48),
    inset 0 0 10px rgba(255, 231, 161, .32);
}

html[data-appearance='light'] .cell.hint-to::after {
  border-color: rgba(95, 51, 13, .88);
  box-shadow:
    inset 0 0 0 1px rgba(255, 247, 214, .72),
    0 0 0 2px rgba(154, 94, 28, .22);
}