body {
    font-family: sans-serif;
    display: flex; /* ★修正: bodyをflexコンテナに */
    flex-direction: column; /* ★追加: 子要素を縦方向に配置 */
    align-items: center; /* ★追加: 子要素をクロス軸（横軸）方向で中央に配置 */
    min-height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
    padding-top: 20px;
    padding-bottom: 20px;
}

.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center; /* 中のインライン要素やテキストの中央寄せ */
    width: 90%;
    max-width: 600px;   /* メインコンテンツの最大幅 */
    /* margin-left: auto;  bodyがflexコンテナでalign-items:centerなら不要 */
    /* margin-right: auto; bodyがflexコンテナでalign-items:centerなら不要 */
    /* clear: both; を削除、または必要に応じて再検討 */
}

/* ツール説明文用のスタイル */
.tool-description {
    margin-top: 15px;
    margin-bottom: 25px;
    padding: 15px;
    background-color: #f0f8ff;
    border-left: 5px solid #007bff;
    border-radius: 0 5px 5px 0;
    text-align: left;
    font-size: 0.9em;
    line-height: 1.6;
    color: #333;
}

.tool-description p {
    margin-top: 0;
    margin-bottom: 0.75em;
}

.tool-description p:last-child {
    margin-bottom: 0;
}

.probability-settings {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.probability-settings h2 {
    margin-top: 0;
}

.probability-settings label {
    margin-right: 5px;
}

.probability-settings input[type="number"] {
    width: 50px;
    margin-right: 15px;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

.probability-settings button {
    padding: 8px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.probability-settings button:hover:not(:disabled) {
    background-color: #0056b3;
}

.error-message {
    color: red;
    font-size: 0.9em;
    margin-top: 5px;
}

.game-area {
    margin-bottom: 20px;
}

.cards-container {
    display: flex;
    justify-content: space-around;
    margin-bottom: 15px;
    perspective: 1000px;
}

.card {
    width: 100px;
    height: 150px;
    cursor: pointer;
    position: relative;
}

.card-inner {
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    position: absolute;
    top: 0;
    left: 0;
}

.card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    width: 100%;
    height: 100%;
    position: absolute;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
}

.card-back {
    background-color: #6c757d;
    color: white;
}

.card-front {
    background-color: #f8f9fa;
    transform: rotateY(180deg);
    color: #333;
    font-weight: bold;
}

/* レアリティごとの色 */
.card-front.UR { background-color: #ff69b4; color: white; }
.card-front.SR { background-color: #ffd700; color: #8B4513; }
.card-front.R  { background-color: #87ceeb; color: #000080; }
.card-front.N  { background-color: #d3d3d3; color: #333; }


.controls {
    margin-bottom: 20px;
}

.control-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

#manual-controls-row {
    margin-bottom: 15px;
}

.auto-controls-group {
    border: 1px solid #007bff;
    border-radius: 8px;
    padding: 15px 10px 10px 10px;
    margin-top: 10px;
    background-color: #f8f9fa;
    width: 100%; /* 親(.container)の幅に合わせる */
    box-sizing: border-box; /* paddingとborderを幅計算に含める */
}

.auto-controls-title {
    font-weight: bold;
    font-size: 1.1em;
    padding: 0 10px;
    margin-left: 15px;
    color: #0056b3;
    background-color: #f8f9fa;
}

#auto-controls-row {
    margin-bottom: 0;
}

.controls button {
    padding: 10px 15px;
    margin: 5px;
    font-size: 14px;
    cursor: pointer;
    border-radius: 5px;
    border: none;
    transition: background-color 0.2s ease;
    min-width: 120px;
    text-align: center;
}

.auto-button {
    background-color: #ffc107;
    color: #212529;
}

.auto-button:hover:not(:disabled) {
    background-color: #e0a800;
}

/* 全てのボタンの :disabled スタイル */
.controls button:disabled,
#reset-inventory-btn:disabled,
.probability-settings button:disabled { /* 確率設定ボタンも対象に */
    background-color: #ccc !important;
    color: #666 !important;
    cursor: not-allowed !important;
    border-color: #bbb !important;
}

#update-cards-btn {
    background-color: #28a745;
    color: white;
}
#update-cards-btn:hover:not(:disabled) {
    background-color: #1e7e34;
}

#reset-inventory-btn {
    background-color: #dc3545;
    color: white;
    display: block;
    width: fit-content;
    min-width: 180px;
    padding: 10px 15px;
    margin: 20px auto 10px auto; /* .container の text-align:center の影響を受けないようにautoで中央寄せ */
    font-size: 14px;
    text-align: center;
    cursor: pointer;
    border-radius: 5px;
    border: none;
    transition: background-color 0.2s ease;
}

#reset-inventory-btn:hover:not(:disabled) {
    background-color: #c82333;
}


.inventory {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 10px; /* リセットボタンとの間に少しマージン */
    width: 100%; /* 親(.container)の幅に合わせる */
    box-sizing: border-box;
}

.inventory h2 {
    margin-top: 0;
}

/* モーダル関連のCSS */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0s linear 0s;
}

.modal-content {
    background-color: #fefefe;
    margin: auto;
    padding: 25px 30px;
    border: 1px solid #888;
    width: 80%;
    max-width: 400px;
    border-radius: 8px;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-close-button {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 28px;
    font-weight: bold;
    line-height: 1;
}

.modal-close-button:hover,
.modal-close-button:focus {
    color: #333;
    text-decoration: none;
    cursor: pointer;
}

#modal-message {
    font-size: 1.1em;
    margin-top: 10px;
    margin-bottom: 10px;
}

/* 広告画像用のスタイル */
.ad-container {
    width: 100%; /* 画面幅いっぱいに */
    /* max-width: 1000px; */ /* 広告の最大幅を指定する場合 */
    /* max-width: 600px; */ /* もしメインコンテンツの幅に合わせたい場合 */
    text-align: center;
    padding: 0;
    background-color: #f0f0f0; /* ボディ背景と合わせる */
    margin-top: 20px; /* 上の .container との間隔 */
    /* margin-left: auto; bodyがflexコンテナでalign-items:centerなら不要 */
    /* margin-right: auto; bodyがflexコンテナでalign-items:centerなら不要 */
    /* clear: both; */ /* float対策（通常は不要なはず） */
}

#ad-image {
    max-width: 100%; /* 親要素(.ad-container)の幅に収まるように */
    height: auto;
    display: inline-block; /* text-align:centerで中央寄せするため */
}


/* ==========================================================================
   レスポンシブ対応スタイル
   ========================================================================== */

@media screen and (max-width: 768px) {
    .container {
        /* width: 90%; */ /* bodyがalign-items:centerなら不要 */
        padding: 15px;
    }

    h1 { font-size: 1.8em; }
    h2 { font-size: 1.3em; }

    .probability-settings input[type="number"] {
        width: 45px;
        margin-right: 10px;
    }

    .controls button,
    #reset-inventory-btn {
        min-width: 110px;
    }

    .card {
        width: 90px;
        height: 135px;
    }
    .card-front, .card-back {
        font-size: 22px;
    }
}

@media screen and (max-width: 600px) {
    body {
        padding-top: 10px;
        padding-bottom: 10px;
        font-size: 15px;
    }

    .container {
        width: 95%; /* bodyがalign-items:centerなので、この指定が効く */
        padding: 10px;
    }

    h1 { font-size: 1.6em; }
    h2 { font-size: 1.2em; }

    .tool-description {
        padding: 10px;
        font-size: 0.9em;
        margin-bottom: 20px;
    }

    .probability-settings {
        padding: 10px;
    }
    .probability-settings label {
        display: block;
        margin-bottom: 3px;
        text-align: left;
    }
    .probability-settings input[type="number"] {
        display: inline-block;
        width: calc(25% - 10px);
        min-width: 40px;
        margin-right: 5px;
        margin-bottom: 10px;
        padding: 6px;
    }
     .probability-settings label[for="prob-n"] + input[type="number"]{
        margin-right: 0;
    }
    .probability-settings button {
        width: 100%;
        padding: 10px;
        font-size: 1em;
    }

    .card {
        width: 70px;
        height: 105px;
    }
    .card-front, .card-back {
        font-size: 18px;
    }
    .game-area p {
        font-size: 0.95em;
    }

    .controls button,
    #reset-inventory-btn {
        font-size: 0.9em;
        min-width: unset;
        width: calc(50% - 10px);
        padding: 8px 5px;
        margin: 4px;
    }
    .auto-button,
    #reset-inventory-btn { /* リセットボタンも1列に */
        width: calc(100% - 8px);
    }
     #manual-controls-row {
         margin-bottom: 8px;
     }
     .auto-controls-group {
        margin-bottom: 10px;
        padding: 10px 5px 5px 5px;
    }
    .auto-controls-title {
        font-size: 1em;
        margin-left: 5px;
        padding: 0 5px;
    }


    .inventory p {
        font-size: 0.95em;
        margin: 5px 0;
    }
    #reset-inventory-btn {
        margin-top: 15px;
    }

    .modal-content {
        width: 90%;
        padding: 20px 15px;
    }
    #modal-message {
        font-size: 1em;
    }

    .ad-container {
        padding: 15px 0;
        width: 100%; /* bodyがalign-items:centerなので、この指定がなくても中央になるが念のため */
    }
}

@media screen and (max-width: 380px) {
    body {
        font-size: 14px;
    }
    h1 { font-size: 1.4em; }
    h2 { font-size: 1.1em; }

    .tool-description {
        font-size: 0.85em;
        padding: 8px;
        border-left-width: 4px;
    }

    .probability-settings input[type="number"] {
        width: calc(50% - 8px); /* 2x2にする */
        padding: 5px;
        margin-right: 4px;
    }

    .card {
        width: 60px;
        height: 90px;
    }
    .card-front, .card-back {
        font-size: 15px;
    }

    .controls button,
    #reset-inventory-btn {
        width: calc(100% - 8px);
        margin: 4px auto;
    }
     #manual-controls-row button:last-child {
        margin-bottom: 10px;
    }


    .game-area p, .inventory p {
        font-size: 0.9em;
    }
    #reset-inventory-btn {
        margin-top: 15px;
    }

    .ad-container {
        padding: 10px 0;
    }
}

.auto-target-points-setting {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center; /* 中央寄せする場合 */
    /* justify-content: flex-start; */ /* 左寄せにする場合 */
    gap: 8px; /* ラベルと入力欄の間隔 */
}

.auto-target-points-setting label {
    /* margin-right: 8px; */ /* gapを使用する場合は不要 */
    font-size: 0.9em;
}

.auto-target-points-setting input[type="number"] {
    width: 80px; /* 幅を調整 */
    padding: 6px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.9em;
}

/* レスポンシブ対応（必要に応じて調整） */
@media screen and (max-width: 600px) {
    .auto-target-points-setting {
        flex-direction: column; /* 小画面では縦並びも考慮 */
        align-items: stretch; /* 縦並びの場合、幅を揃える */
        gap: 5px;
    }
    .auto-target-points-setting input[type="number"] {
        width: auto; /* 親要素に合わせる */
    }
    .auto-controls-group .control-row { /* ボタンとの間隔調整 */
        margin-top: 5px;
    }
}