:root {
      /* 画像を差し替える場合は none を url("画像パス") に変更 */
      --title-background-image: url("../image/title_sakura.png");
      --game-background-image: url("../image/tatami.jpg");
      --card-background-image: none;
      --life-image: url("../image/life_hand.png");
      --life-explosion-image: url("../image/life_explosion.png");

      --black: #000000;
      --white: #ffffff;
      --blue: #0057ff;
      --red: #ff1e00;
      --yellow: #ffd900;
      --green: #00a651;
      --purple: #7300ff;
      --app-max-width: 430px;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      border-radius: 0 !important;
      box-shadow: none !important;
    }

    html, body {
      width: 100%;
      height: 100%;
      margin: 0;
      overflow: hidden;
      background: var(--black);
      color: var(--black);
      font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
      -webkit-text-size-adjust: 100%;
    }

    body {
      display: flex;
      justify-content: center;
    }

    button {
      appearance: none;
      border: 3px solid var(--black);
      background: var(--white);
      color: var(--black);
      font: inherit;
      font-weight: 900;
      cursor: pointer;
      touch-action: manipulation;
    }

    /* 札を含む全ボタンを押下時に黄色へ変える処理は使わない。
       タッチ端末では :active が残り、誤答札が正解色に見えるため。 */

    button:focus-visible {
      outline: 4px solid var(--blue);
      outline-offset: 2px;
    }

    #app {
      position: relative;
      width: 100%;
      max-width: var(--app-max-width);
      height: 100vh;
      height: 100dvh;
      margin: 0 auto;
      overflow: hidden;
      background: var(--white);
    }

    .screen {
      display: none;
      width: 100%;
      height: 100%;
    }

    .screen.is-active {
      display: flex;
    }

    /* タイトル画面 */
    #titleScreen {
      flex-direction: column;
      justify-content: center;
      align-items: stretch;
      gap: 18px;
      padding: max(18px, env(safe-area-inset-top)) 18px max(18px, env(safe-area-inset-bottom));
      background-color: var(--white);
      background-image: var(--title-background-image);
      background-position: center;
      background-size: cover;
      background-repeat: no-repeat;
    }

    .title-box {
      border-top: 8px solid var(--black);
      border-bottom: 8px solid var(--black);
      padding: 18px 8px;
      text-align: center;
      background: var(--white);
    }

    .game-title {
      margin: 0;
      font-size: clamp(34px, 12vw, 58px);
      line-height: 1;
      letter-spacing: 0.08em;
      font-weight: 1000;
    }

    .title-sub {
      margin: 10px 0 0;
      font-size: 14px;
      font-weight: 800;
    }

    .difficulty-list {
      display: grid;
      gap: 10px;
    }

    .difficulty-button {
      min-height: 58px;
      padding: 10px 12px;
      font-size: 21px;
      background: var(--white);
    }

    .difficulty-button small {
      display: block;
      margin-top: 2px;
      font-size: 12px;
      font-weight: 800;
    }

    /* ゲーム画面 */
    #gameScreen {
      flex-direction: column;
      min-height: 0;
      padding: max(5px, env(safe-area-inset-top)) 5px max(5px, env(safe-area-inset-bottom));
      background-color: var(--white);
      background-image: var(--game-background-image);
      background-position: center;
      background-size: cover;
      background-repeat: no-repeat;
    }

    .hud {
      flex: 0 0 auto;
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 5px;
      min-height: 38px;
      border: 3px solid var(--black);
      background: var(--white);
      padding: 4px 6px;
    }

    .hud-left {
      display: flex;
      align-items: baseline;
      gap: 10px;
      min-width: 0;
      white-space: nowrap;
      font-weight: 900;
      font-size: 13px;
    }

    #scoreValue {
      color: var(--blue);
      font-size: 19px;
    }

    #remainingValue {
      color: var(--purple);
      font-size: 16px;
    }

    .lives {
      display: flex;
      align-items: center;
      gap: 3px;
    }

    .life-mark {
      display: grid;
      place-items: center;
      width: 24px;
      height: 24px;
      border: 2px solid var(--black);
      background-color: var(--red);
      background-image: var(--life-image);
      background-position: center;
      background-size: contain;
      background-repeat: no-repeat;
      color: var(--white);
      font-size: 12px;
      font-weight: 1000;
      line-height: 1;
    }

    .life-mark.is-lost {
      background-color: var(--white);
      color: var(--black);
    }

    .reader-panel {
      flex: 0 0 auto;
      min-height: 92px;
      margin-top: 5px;
      border: 3px solid var(--black);
      background: var(--white);
      padding: 6px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    #readerText {
      height: 76px;
      display: grid;
      grid-template-rows: 1fr 1fr;
      align-items: center;
      border: 2px solid var(--black);
      padding: 4px 6px;
      background: var(--white);
      font-weight: 500;
      font-size: clamp(19px, 6vw, 27px);
      line-height: 1.2;
      letter-spacing: 0.02em;
      text-align: center;
    }

    .reader-line {
      min-width: 0;
      min-height: 1.2em;
      display: flex;
      justify-content: center;
      align-items: center;
      white-space: nowrap;
      overflow: hidden;
    }

    .reader-char {
      display: inline-block;
    }

    .reader-space {
      display: inline-block;
      width: 0.7em;
      flex: 0 0 0.7em;
    }

    .reader-meta {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-top: 4px;
    }

    .timer-track {
      height: 13px;
      border: 2px solid var(--black);
      background: var(--white);
      overflow: hidden;
    }

    #timerBar {
      width: 100%;
      height: 100%;
      background: var(--red);
    }

    #cardGrid {
      flex: 1 1 auto;
      min-height: 0;
      display: grid;
      grid-template-columns: repeat(var(--columns), var(--card-width, 1fr));
      grid-template-rows: repeat(var(--rows), var(--card-height, 1fr));
      justify-content: center;
      align-content: start;
      gap: 3px;
      overflow: hidden;
    }

    .karuta-card {
      position: relative;
      width: var(--card-width, auto);
      height: var(--card-height, auto);
      min-width: 0;
      min-height: 0;
      max-width: var(--card-width, none);
      max-height: var(--card-height, none);
      aspect-ratio: 0.72 / 1;
      padding: 2px;
      border: 4px solid #075c28;
      background-color: var(--white);
      background-image: var(--card-background-image);
      background-position: center;
      background-size: 100% 100%;
      color: var(--black);
      display: grid;
      place-items: center;
      overflow: hidden;
      font-weight: 1000;
      -webkit-tap-highlight-color: transparent;
    }

    .karuta-card .card-text {
      writing-mode: vertical-rl;
      text-orientation: upright;
      line-height: 1;
      letter-spacing: 0;
      font-size: clamp(12px, 4vw, 20px);
      max-height: calc(100% - 10px);
      white-space: nowrap;
      overflow: hidden;
      pointer-events: none;
    }

    #cardGrid[data-columns="6"] .card-text {
      font-size: clamp(9px, 2.9vw, 12px);
    }

    #cardGrid[data-columns="4"] .card-text {
      font-size: clamp(12px, 4vw, 18px);
    }

    #cardGrid[data-columns="5"] .card-text {
      font-size: clamp(10px, 3.4vw, 15px);
    }

    #cardGrid[data-columns="3"] .card-text {
      font-size: clamp(16px, 5.5vw, 24px);
    }

    .karuta-card.is-taken {
      background-color: var(--yellow);
      pointer-events: none;
    }

    .karuta-card.is-taken .card-text {
      visibility: hidden;
    }

    .karuta-card.is-taken::after {
      content: "取得";
      font-size: clamp(10px, 3.5vw, 17px);
      font-weight: 1000;
      color: var(--black);
    }

    .karuta-card.is-wrong {
      animation: wrongCard 240ms steps(2, jump-none) 2;
    }

    @keyframes wrongCard {
      from { background-color: var(--red); color: var(--white); border-width: 5px; }
      to { background-color: var(--white); color: var(--black); border-width: 4px; border-color: #075c28; }
    }

    .karuta-card.is-correct {
      background-color: var(--green);
      color: var(--white);
      border-width: 5px;
    }

    @media (max-height: 600px) {
      #gameScreen { padding-top: max(3px, env(safe-area-inset-top)); padding-bottom: max(3px, env(safe-area-inset-bottom)); }
      .hud { min-height: 34px; padding: 2px 5px; }
      .life-mark { width: 23px; height: 23px; }
      .reader-panel { min-height: 78px; margin-top: 3px; padding: 3px 5px; }
      #readerText { height: 65px; min-height: 65px; font-size: clamp(17px, 5.5vw, 23px); }
      .reader-meta { margin-top: 1px; }
      #cardGrid { gap: 2px; }
      .karuta-card { border-width: 1.5px; }
    }

    @media (prefers-reduced-motion: reduce) {
      .reader-char, .karuta-card.is-wrong { animation-duration: 1ms; animation-iteration-count: 1; }
    }

    #handEffectLayer {
      position: fixed;
      inset: 0;
      overflow: hidden;
      pointer-events: none;
      z-index: 9999;
    }

    .take-hand {
      position: fixed;
      left: 0;
      top: 0;
      display: block;
      pointer-events: none;
      opacity: 1;
      transform-origin: 50% 100%;
    }

    .take-hand.is-leaving {
      opacity: 0;
      transition: opacity 80ms linear;
    }

    /* ===== 作例に合わせた素朴なWebゲーム調の上書き ===== */
    :root {
      --ui-gray: #c8c8c8;
      --ui-light-gray: #eeeeee;
      --board-green: #087a2f;
      --button-red: #ff3333;
      --button-orange: #ff9d2e;
      --button-cyan: #25b9ed;
      --button-blue: #3150ff;
    }

    html, body {
      font-family: Arial, "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
    }

    button {
      border-width: 2px;
      font-weight: 700;
    }

    /* 押下フィードバックは各操作ボタンにだけ個別指定する。 */

    /* タイトル画面：余計な装飾を避けて、見出しと選択肢を直接配置 */
    #titleScreen {
      justify-content: flex-start;
      gap: 0;
      padding: max(12px, env(safe-area-inset-top)) 12px max(12px, env(safe-area-inset-bottom));
      background-color: var(--white);
      background-image: var(--title-background-image);
      background-position: center;
      background-size: cover;
      background-repeat: no-repeat;
    }

    .title-box {
      width: 100%;
      margin-top: 2px;
      border: 0;
      padding: 5px 8px;
      background: var(--ui-gray);
    }

    .game-title {
      font-size: clamp(27px, 9vw, 42px);
      line-height: 1.15;
      letter-spacing: 0;
      font-weight: 500;
    }

    .title-sub {
      width: 100%;
      margin: 22px 0 10px;
      padding: 0;
      background: var(--white);
      color: var(--black);
      font-size: clamp(20px, 6.5vw, 29px);
      line-height: 1.3;
      font-weight: 500;
      text-align: center;
    }

    .difficulty-list {
      width: 100%;
      display: grid;
      gap: 12px;
      margin-top: 8px;
    }

    .difficulty-button {
      display: block;
      min-height: 72px;
      padding: 8px 15px;
      border: 2px solid var(--black);
      background: var(--white);
      color: var(--black);
      font-size: clamp(25px, 8vw, 34px);
      font-weight: 500;
      text-align: center;
    }

    .difficulty-button:active {
      background: var(--white);
      color: var(--black);
    }

    /* ゲーム画面：情報、読み札、盤面を明確なブロックとして配置 */
    #gameScreen {
      padding: max(3px, env(safe-area-inset-top)) 4px max(4px, env(safe-area-inset-bottom));
      background-color: var(--white);
      background-image: var(--game-background-image);
      background-position: center;
      background-size: cover;
      background-repeat: no-repeat;
    }

    .hud {
      grid-template-columns: auto 1fr auto;
      min-height: 42px;
      gap: 7px;
      border: 0;
      border-bottom: 3px solid var(--black);
      padding: 3px 4px 5px;
      background: var(--white);
    }

    .hud-name {
      align-self: stretch;
      display: grid;
      place-items: center;
      min-width: 48px;
      padding: 0 5px;
      background: var(--ui-gray);
      color: var(--black);
      font-size: 14px;
      font-weight: 700;
    }

    .hud-left {
      gap: 8px;
      font-size: 12px;
      font-weight: 500;
    }

    #scoreValue,
    #remainingValue {
      color: var(--black);
      font-size: 17px;
      font-weight: 700;
    }

    .lives {
      gap: 2px;
    }

    .life-mark {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      border: 0;
      padding: 0;
      background-color: transparent;
      background-image: var(--life-image);
      background-position: center;
      background-size: contain;
      background-repeat: no-repeat;
      color: transparent;
      font-size: 0;
      font-weight: 700;
      cursor: pointer;
    }

    .life-mark:disabled {
      cursor: default;
    }

    .life-mark.is-lost {
      opacity: 0.18;
      filter: grayscale(100%);
      background-color: transparent;
      color: transparent;
    }

    .life-mark.is-exploded {
      opacity: 1;
      filter: none;
      background-color: transparent;
      background-image: var(--life-explosion-image);
      background-size: contain;
      transform: scale(1.25);
      color: transparent;
    }

    .reader-panel {
      flex: 0 0 auto;
      min-height: 94px;
      margin-top: 2px;
      border: 0;
      padding: 0;
      background: transparent;
    }

    #readerText {
      height: 78px;
      min-height: 78px;
      border: 2px solid var(--black);
      padding: 4px 6px;
      background: var(--white);
      font-size: clamp(19px, 6vw, 27px);
      font-weight: 500;
      letter-spacing: 0.02em;
    }

    .reader-meta {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-top: 3px;
    }

    .timer-track {
      width: min(82%, 310px);
      height: 12px;
      border: 1px solid var(--black);
      background: var(--white);
    }

    #timerBar {
      background: var(--button-red);
    }

    #cardGrid {
      gap: 8px;
      border: 0;
      padding: 3px 9px 9px;
      background: transparent;
      justify-content: center;
      align-content: start;
    }

    .karuta-card {
      border: 4px solid #075c28;
      padding: 1px;
      background-color: var(--white);
      color: var(--black);
      font-weight: 500;
    }

    /* 取札は押しても黄色にしない。黄色は .is-correct のみ。 */
    .karuta-card:active,
    .karuta-card:focus,
    .karuta-card:focus-visible {
      background-color: var(--white) !important;
      color: var(--black) !important;
    }

    .karuta-card.is-wrong,
    .karuta-card.is-wrong:active,
    .karuta-card.is-wrong:focus {
      background-color: var(--button-red) !important;
      color: var(--white) !important;
    }

    .karuta-card.is-correct,
    .karuta-card.is-correct:active,
    .karuta-card.is-correct:focus {
      background-color: var(--yellow) !important;
      color: var(--black) !important;
    }

    .karuta-card .card-text {
      font-weight: 500;
      letter-spacing: 0;
    }

    .karuta-card.is-taken {
      background-color: var(--ui-gray);
    }

    .karuta-card.is-taken::after {
      content: "済";
      font-weight: 700;
    }

    .karuta-card.is-correct {
      background-color: var(--yellow);
      color: var(--black);
      border-width: 3px;
    }

    @keyframes wrongCard {
      from { background-color: var(--button-red); color: var(--white); border-width: 3px; }
      to { background-color: var(--white); color: var(--black); border-width: 4px; border-color: #075c28; }
    }

    @media (max-height: 600px) {
      .hud { min-height: 37px; padding-bottom: 3px; }
      .hud-name { min-width: 42px; font-size: 12px; }
      .life-mark { width: 23px; height: 23px; }
      .reader-panel { min-height: 82px; margin-top: 1px; }
      #readerText { height: 65px; min-height: 65px; padding: 2px 4px; font-size: clamp(17px, 5.4vw, 22px); }
      .reader-meta { margin-top: 2px; }
      #cardGrid { gap: 5px; padding: 2px 6px 6px; }
      .karuta-card { border-width: 3px; }
      #cardGrid[data-columns="6"] .card-text { font-size: clamp(8px, 2.7vw, 10px); }
    }

    @media (max-width: 350px) {
      .hud { gap: 4px; }
      .hud-name { min-width: 40px; padding-inline: 3px; font-size: 12px; }
      .hud-left { gap: 5px; font-size: 10px; }
      #scoreValue, #remainingValue { font-size: 15px; }
      .life-mark { width: 20px; height: 20px; }
    }


/* 読み上げ文字・取札 */
#readerText,
.karuta-card .card-text {
  font-family: "Yuji Boku", serif;
  font-weight: 400;
  font-style: normal;
}


/* ===== v4 最終調整 ===== */
.difficulty-button,
.difficulty-button[data-level="beginner"],
.difficulty-button[data-level="normal"],
.difficulty-button[data-level="advanced"] {
  border: 2px solid var(--black) !important;
}

#cardGrid {
  align-content: start;
}

.karuta-card .card-text {
  white-space: nowrap;
  overflow: hidden;
}


.title-guide-wrap {
  width: 100%;
  margin-top: 10px;
  display: flex;
  justify-content: center;
}

.title-guide-image {
  display: block;
  width: 100%;
  max-width: 380px;
  height: auto;
  max-height: min(42vh, 460px);
  object-fit: contain;
}

@media (max-height: 700px) {
  .title-guide-wrap {
    margin-top: 8px;
  }

  .title-guide-image {
    max-height: min(36vh, 320px);
  }
}


/* ===== v14 取得済み札の全文表示 ===== */
.karuta-card.is-taken,
.karuta-card.is-taken:active,
.karuta-card.is-taken:focus,
.karuta-card.is-taken:focus-visible {
  background-color: var(--ui-gray) !important;
  background-image: none !important;
  color: #000000 !important;
  border-color: #075c28 !important;
  pointer-events: none;
}

.karuta-card.is-taken .card-text {
  display: none;
}

.karuta-card.is-taken::after {
  content: none !important;
  display: none !important;
}

.taken-poem {
  width: 100%;
  height: 100%;
  padding: 3px 1px;
  display: flex;
  flex-direction: row-reverse;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  color: #000000;
  pointer-events: none;
}

.taken-poem-line {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: upright;
  white-space: nowrap;
  line-height: 1;
  letter-spacing: 0;
  font-family: "Yuji Boku", serif;
  font-weight: 400;
  color: #000000;
}


/* ===== v15 取得済み札の文字色修正 ===== */
.karuta-card.is-taken .taken-poem,
.karuta-card.is-taken .taken-poem-line {
  color: #000000 !important;
}