body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    background-color: #ffffff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin: 10px;
    box-sizing: border-box;
    position: relative;
}

header {
    text-align: center;
    margin-bottom: 15px;
    color: #007bff;
}
header h1 {
    margin-bottom: 5px;
}
header p {
    font-size: 0.9em;
    color: #6c757d;
    margin-top: 0;
}

#reset-button-container {
    position: fixed;
    bottom: 15px;
    right: 15px;
    z-index: 1050;
}

#reset-hand-button {
    padding: 8px 12px;
    font-size: 0.85em;
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    opacity: 0.8;
    transition: opacity 0.2s, background-color 0.2s;
}
#reset-hand-button:hover {
    background-color: #5a6268;
    opacity: 1;
}

.controls-bottom {
    text-align: center;
    margin-top: 20px;
}
.controls-bottom button {
    padding: 12px 25px;
    font-size: 1.05em;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}
.controls-bottom button:hover {
    background-color: #0056b3;
}

.hand-container {
    display: flex;
    gap: 12px;
    padding: 30px 15px 15px;
    background-color: #e9ecef;
    border-radius: 6px;
    min-height: 220px;
    align-items: flex-start;
    overflow-x: auto;
    border: 1px solid #dee2e6;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
}

.card {
    border: 1px solid #adb5bd;
    background-color: #fff;
    border-radius: 8px;
    padding: 12px;
    min-width: 120px;
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: relative;
    transition: transform 0.3s ease-out, opacity 0.3s ease-out;
}
.card:hover {
    transform: translateY(-3px) !important;
}
.card.removing {
    transform: translateY(-60px) scale(0.95);
    opacity: 0;
}

.card-position-indicator {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75em;
    font-weight: bold;
    background-color: rgba(0,0,0,0.65);
    color: white;
    padding: 3px 6px;
    border-radius: 10px;
    white-space: nowrap;
    z-index: 10;
}

.card-hints {
    font-size: 0.9em;
    overflow-y: auto;
    max-height: 140px;
    margin-bottom: 8px;
    padding-right: 5px;
    display: grid;
    grid-template-columns: auto auto;
    gap: 0px 10px;
    align-items: baseline;
}

.card-hints::-webkit-scrollbar { width: 5px; }
.card-hints::-webkit-scrollbar-thumb { background: #ccc; border-radius: 3px; }
.card-hints::-webkit-scrollbar-track { background: #f0f0f0; }

.hint-item {
    padding: 1px 3px;
    margin: 1.5px 0;
    border-radius: 3px;
    font-size: 1em;
    transition: all 0.3s ease;
    text-align: center;
    white-space: nowrap;
    line-height: 1.3;
}
.hint-possible {
    color: #aaa;
    font-weight: normal;
}
.hint-confirmed {
    font-weight: bold;
}
.hint-confirmed.color-red    { color: #d32f2f; background-color: #ffebee;}
.hint-confirmed.color-blue   { color: #1976d2; background-color: #e3f2fd;}
.hint-confirmed.color-yellow { color: #fbc02d; background-color: #fffde7;}
.hint-confirmed.color-green  { color: #388e3c; background-color: #e8f5e9;}
.hint-confirmed.color-white  { color: #757575; background-color: #fafafa;}
.hint-confirmed.number       { color: #333;    background-color: #e0e0e0;}
.hint-negated {
    color: #ccc;
    text-decoration: line-through;
    font-style: italic;
    opacity: 0.7;
}

.card-actions button {
    width: 100%;
    padding: 8px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease-in-out;
}
.card-actions button:hover {
    background-color: #c82333;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
}
.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 25px;
    border: 1px solid #dee2e6;
    width: 90%;
    max-width: 550px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    position: relative;
}
.close-button {
    color: #aaa;
    float: right;
    font-size: 32px;
    font-weight: bold;
    line-height: 1;
}
.close-button:hover,
.close-button:focus {
    color: #333;
    text-decoration: none;
    cursor: pointer;
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}
.hint-type-selection {
    display: flex;
    align-items: center;
}
.hint-type-selection input[type="radio"] {
    margin-right: 5px;
}
.hint-type-selection label {
    font-weight: normal;
    margin-right: 20px;
    margin-bottom: 0;
}
.hint-input-row {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    margin-bottom: 18px;
}
.hint-input-row > .form-group {
    margin-bottom: 0;
}
.target-cards-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 4px;
    border: 1px solid #dee2e6;
}
.target-card-label {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    cursor: pointer;
    background-color: #fff;
    transition: background-color 0.2s;
    width: 165px;
    min-width: 165px;
    max-width: 165px;
    box-sizing: border-box;
}
.target-card-label:hover {
    background-color: #e9ecef;
}
.target-card-label input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.1);
}

#record-hint-button {
    padding: 12px 20px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s ease-in-out;
    /* ▼▼▼ 修正箇所 ▼▼▼ */
    display: block;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    /* ▲▲▲ 修正箇所 ▲▲▲ */
}
#record-hint-button:hover {
    background-color: #218838;
}

.orientation-notice {
    display: none;
    background-color: #fff3cd;
    color: #856404;
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid #ffeeba;
    width: 100%;
    box-sizing: border-box;
    font-weight: 500;
}

@media (max-width: 767px) and (orientation: portrait) {
    .app-container {
        margin: 0;
        padding: 10px;
        border-radius: 0;
        min-height: calc(100vh - 45px);
    }
    .hand-container {
        flex-direction: column;
        align-items: center;
        overflow-x: hidden;
        overflow-y: auto;
        max-height: calc(100vh - 280px);
        padding: 25px 10px 10px;
        width: fit-content;
        margin-left: auto;
        margin-right: auto;
        max-width: 100%;
    }
    .card {
        width: 90%;
        min-width: unset;
        margin-bottom: 12px;
        height: auto;
        min-height: 180px;
    }
    .card:last-child {
        margin-bottom: 0;
    }
    .card-hints {
        max-height: 120px;
        gap: 0px 8px;
    }
    .card-position-indicator {
        top: 8px;
        left: 8px;
        transform: none;
        font-size: 0.7em;
    }
    .modal-content {
        width: 95%;
        margin: 15% auto;
        padding: 20px;
    }
    .hint-input-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }
    .hint-input-row > .form-group {
        margin-bottom: 18px;
    }
    .hint-input-row > .form-group:last-child {
        margin-bottom: 0;
    }
    /* スマホ縦画面でもボタンが中央寄せされるように、
       #record-hint-button のスタイルはメディアクエリ外で共通化されているため、
       ここでの追加変更は不要です。 */
    #reset-button-container {
        bottom: 10px;
        right: 10px;
    }
    #reset-hand-button {
        padding: 6px 10px;
        font-size: 0.8em;
    }
}