/* 基本スタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Hiragino Kaku Gothic ProN', 'メイリオ', Meiryo, sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
    font-size: 16px;
}

/* コンテナ */
.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 言語選択 */
.language-selector {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

.language-selector select {
    padding: 10px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.2s;
    background-color: white;
}

.language-selector select:hover {
    border-color: #999;
}

.language-selector select:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 32px;
    font-weight: bold;
}

/* クイックスタートパネル */
.quick-start-panel {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.quick-start-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    min-width: 160px;
}

.quick-start-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.quick-start-btn:active {
    transform: translateY(-1px);
}

.quick-start-icon {
    font-size: 32px;
    margin-bottom: 8px;
    font-weight: bold;
}

/* 各ボタンの色 */
.quick-start-btn:nth-child(1) {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.quick-start-btn:nth-child(2) {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.quick-start-btn:nth-child(3) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.quick-start-btn:nth-child(1):hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.quick-start-btn:nth-child(2):hover {
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.6);
}

.quick-start-btn:nth-child(3):hover {
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .quick-start-btn {
        min-width: 140px;
        padding: 16px 24px;
        font-size: 14px;
    }
    
    .quick-start-icon {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .quick-start-panel {
        flex-direction: column;
        align-items: stretch;
    }
    
    .quick-start-btn {
        width: 100%;
    }
}

/* 設定パネル */
.settings-panel {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* 基本設定（横並び） */
.basic-settings {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

/* タブレット・スマホ対応 */
@media (max-width: 768px) {
    .basic-settings {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}

/* アコーディオン */
.accordion {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

.accordion-toggle {
    width: 100%;
    padding: 15px 20px;
    background: #f8f8f8;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: bold;
    color: #333;
    transition: background 0.2s;
    text-align: left;
}

.accordion-toggle:hover {
    background: #ececec;
}

.accordion-icon {
    font-size: 12px;
    transition: transform 0.3s ease;
    display: inline-block;
}

.accordion.open .accordion-icon {
    transform: rotate(-180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: white;
}

.accordion.open .accordion-content {
    max-height: 2000px;
    padding: 20px;
}

.setting-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 5px 0;
}

.setting-group label {
    font-weight: bold;
    color: #333;
    min-width: 200px;
    font-size: 17px;
}

.setting-group select,
.setting-group input[type="number"],
.setting-group input[type="text"] {
    padding: 12px 16px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    transition: border-color 0.2s;
}

.setting-group select:hover,
.setting-group input[type="number"]:hover,
.setting-group input[type="text"]:hover {
    border-color: #999;
}

.setting-group select:focus,
.setting-group input[type="number"]:focus,
.setting-group input[type="text"]:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.setting-group input[type="number"] {
    width: 100px;
}

.setting-group input[type="text"] {
    flex: 1;
    min-width: 200px;
}

.setting-group small {
    color: #999;
    font-size: 14px;
    width: 100%;
    margin-left: 212px;
}

/* チェックボックスのスタイル改善 */
.setting-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    margin-right: 8px;
}

.setting-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    min-width: auto;
    font-size: 17px;
    cursor: pointer;
    user-select: none;
}

/* インラインチェックボックス（括弧内） */
#randomNegativeInline,
#randomShuffleInline {
    margin-left: 8px;
    font-size: 15px;
    color: #666;
}

#randomNegativeInline input[type="checkbox"],
#randomShuffleInline input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 6px;
    margin-left: 4px;
}

/* 固定数値パネル */
.fixed-numbers-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
}

.fixed-number-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.fixed-number-group label {
    font-weight: bold;
    color: #333;
    font-size: 16px;
}

/* 割り算プリセットパネル */
.division-preset-panel {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    width: 100%;
    max-width: 900px;
    box-sizing: border-box;
    margin: 10px 0;
}

.division-preset-panel > label:first-child {
    font-weight: bold;
    color: #333;
    font-size: 16px;
    margin-bottom: 8px;
}

.preset-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-top: 8px;
    margin-bottom: 12px;
    width: 100%;
}

.preset-options .radio-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 12px;
    padding: 6px 8px;
    border: 2px solid #ddd;
    border-radius: 6px;
    background-color: white;
    transition: all 0.2s;
    white-space: nowrap;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preset-options .radio-label:hover {
    border-color: #4CAF50;
    background-color: #f0f8f0;
}

.preset-options .radio-label input[type="radio"] {
    cursor: pointer;
    margin: 0;
}

.preset-options .radio-label input[type="radio"]:checked + span {
    color: #4CAF50;
    font-weight: 600;
}

/* レスポンシブ対応: 小さい画面では1列に */
@media (max-width: 768px) {
    .preset-options {
        grid-template-columns: 1fr;
    }
}

.integer-ratio-setting {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    width: 100%;
}

.integer-ratio-setting label {
    font-weight: 600;
    color: #333;
    font-size: 15px;
    min-width: auto;
}

.integer-ratio-setting select {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    background-color: white;
}

.integer-ratio-setting small {
    color: #666;
    font-size: 13px;
    margin-left: 0;
    width: auto;
}

/* ボタングループ */
.button-group {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
}

.btn {
    padding: 16px 40px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background-color: #4CAF50;
    color: white;
}

.btn-primary:hover {
    background-color: #45a049;
}

.btn-secondary {
    background-color: #2196F3;
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #0b7dda;
}

.btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

/* 印刷エリア */
.print-area {
    display: none;
    background-color: white;
}

.print-area.active {
    display: block;
    margin-top: 30px;
}

.page-section {
    background-color: white;
    padding: 20px;
}

.section-header {
    margin-bottom: 15px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.section-header h2 {
    font-size: 20px;
    color: #333;
    margin: 0;
}

.info {
    font-size: 14px;
    color: #666;
    margin: 0;
}

.table-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 百マス計算の表 */
.calculation-table {
    border-collapse: collapse;
    margin: 0 auto;
}

.calculation-table td {
    border: 1px solid #333;
    text-align: center;
    vertical-align: middle;
    font-weight: bold;
}

/* 左上のセル（空白） */
.calculation-table td.corner {
    background-color: #333;
    border: 1px solid #333;
}

/* ヘッダー行・列 */
.calculation-table td.header {
    background-color: #e0e0e0;
    font-weight: bold;
}

/* 通常のセル */
.calculation-table td.cell {
    background-color: white;
}

/* 斜線のセル（わり算で割り切れない場合） */
.calculation-table td.disabled {
    background-color: #f5f5f5;
    position: relative;
}

.calculation-table td.disabled::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top right,
        transparent 0%,
        transparent calc(50% - 1px),
        #999 calc(50% - 1px),
        #999 calc(50% + 1px),
        transparent calc(50% + 1px),
        transparent 100%);
}

/* マスサイズの動的調整 */
.calculation-table.size-3 td { width: 50px; height: 50px; font-size: 18px; }
.calculation-table.size-4 td { width: 45px; height: 45px; font-size: 17px; }
.calculation-table.size-5 td { width: 40px; height: 40px; font-size: 16px; }
.calculation-table.size-6 td { width: 38px; height: 38px; font-size: 15px; }
.calculation-table.size-7 td { width: 35px; height: 35px; font-size: 14px; }
.calculation-table.size-8 td { width: 33px; height: 33px; font-size: 14px; }
.calculation-table.size-9 td { width: 31px; height: 31px; font-size: 13px; }
.calculation-table.size-10 td { width: 30px; height: 30px; font-size: 13px; }
.calculation-table.size-11 td { width: 30px; height: 30px; font-size: 12px; }
.calculation-table.size-12 td { width: 28px; height: 28px; font-size: 11px; }
.calculation-table.size-13 td { width: 26px; height: 26px; font-size: 11px; }
.calculation-table.size-14 td { width: 24px; height: 24px; font-size: 10px; }
.calculation-table.size-15 td { width: 23px; height: 23px; font-size: 10px; }

/* 印刷スタイル */
@media print {
    * {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    html, body {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
        background-color: white;
        overflow: hidden;
    }

    .no-print {
        display: none !important;
    }

    .print-area {
        display: block !important;
        width: 100%;
        height: 100vh;
        page-break-after: avoid;
        page-break-before: avoid;
        overflow: hidden;
    }

    .page-section {
        page-break-inside: avoid;
        page-break-after: avoid;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        padding: 10px;
        margin: 0;
        box-sizing: border-box;
    }

    .problem-section {
        page-break-after: avoid;
        border-bottom: 1px dashed #ccc;
        height: 66vh;
    }

    .answer-section {
        page-break-before: avoid;
        page-break-after: avoid;
        height: 33vh;
    }

    .section-header {
        margin-bottom: 10px;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 10px;
        flex-wrap: nowrap;
    }

    .section-header h2 {
        font-size: 18px;
        margin: 0;
        white-space: nowrap;
    }

    .info {
        font-size: 12px;
        text-align: center;
        margin: 0;
        white-space: nowrap;
    }

    .table-container {
        flex: 1;
        display: flex;
        justify-content: center;
        align-items: flex-start;
        padding-top: 10px;
    }

    /* 印刷時のマスサイズ調整 - 問題セクション（大きめ） */
    .problem-section .calculation-table.size-3 td { width: 70px; height: 70px; font-size: 24px; }
    .problem-section .calculation-table.size-4 td { width: 60px; height: 60px; font-size: 22px; }
    .problem-section .calculation-table.size-5 td { width: 55px; height: 55px; font-size: 20px; }
    .problem-section .calculation-table.size-6 td { width: 50px; height: 50px; font-size: 18px; }
    .problem-section .calculation-table.size-7 td { width: 46px; height: 46px; font-size: 17px; }
    .problem-section .calculation-table.size-8 td { width: 42px; height: 42px; font-size: 16px; }
    .problem-section .calculation-table.size-9 td { width: 38px; height: 38px; font-size: 15px; }
    .problem-section .calculation-table.size-10 td { width: 36px; height: 36px; font-size: 14px; }
    .problem-section .calculation-table.size-11 td { width: 35px; height: 35px; font-size: 14px; }
    .problem-section .calculation-table.size-12 td { width: 33px; height: 33px; font-size: 13px; }
    .problem-section .calculation-table.size-13 td { width: 31px; height: 31px; font-size: 12px; }
    .problem-section .calculation-table.size-14 td { width: 29px; height: 29px; font-size: 12px; }
    .problem-section .calculation-table.size-15 td { width: 28px; height: 28px; font-size: 11px; }

    /* 印刷時のマスサイズ調整 - 答えセクション（小さめ） */
    .answer-section .calculation-table.size-3 td { width: 50px; height: 50px; font-size: 18px; }
    .answer-section .calculation-table.size-4 td { width: 42px; height: 42px; font-size: 16px; }
    .answer-section .calculation-table.size-5 td { width: 38px; height: 38px; font-size: 15px; }
    .answer-section .calculation-table.size-6 td { width: 34px; height: 34px; font-size: 14px; }
    .answer-section .calculation-table.size-7 td { width: 32px; height: 32px; font-size: 13px; }
    .answer-section .calculation-table.size-8 td { width: 30px; height: 30px; font-size: 12px; }
    .answer-section .calculation-table.size-9 td { width: 27px; height: 27px; font-size: 11px; }
    .answer-section .calculation-table.size-10 td { width: 25px; height: 25px; font-size: 11px; }
    .answer-section .calculation-table.size-11 td { width: 25px; height: 25px; font-size: 10px; }
    .answer-section .calculation-table.size-12 td { width: 24px; height: 24px; font-size: 10px; }
    .answer-section .calculation-table.size-13 td { width: 23px; height: 23px; font-size: 10px; }
    .answer-section .calculation-table.size-14 td { width: 22px; height: 22px; font-size: 9px; }
    .answer-section .calculation-table.size-15 td { width: 21px; height: 21px; font-size: 9px; }

    @page {
        size: A4 portrait;
        margin: 8mm;
    }

    /* 余分なページを防ぐ */
    body::after {
        content: none;
    }
}

/* アラビア語（RTL）対応 */
html[lang="ar"] body,
html[lang="ar"] .container,
html[lang="ar"] .language-selector,
html[lang="ar"] .setting-group,
html[lang="ar"] .fixed-numbers-container {
    direction: rtl;
    text-align: right;
}

html[lang="ar"] .language-selector {
    justify-content: flex-start;
}

html[lang="ar"] label {
    text-align: right;
}

html[lang="ar"] .button-group {
    display: flex;
    flex-direction: row-reverse;
}

/* アラビア語でも数字と表は左から右（LTR）を維持 */
html[lang="ar"] .calculation-table,
html[lang="ar"] .calculation-table td,
html[lang="ar"] input[type="number"],
html[lang="ar"] input[type="text"] {
    direction: ltr;
    text-align: center;
}

html[lang="ar"] .section-header h2,
html[lang="ar"] .info {
    direction: rtl;
    text-align: right;
}

/* レスポンシブ対応 */
@media screen and (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .setting-group {
        flex-direction: column;
        align-items: flex-start;
    }

    .setting-group label {
        min-width: auto;
    }

    .setting-group small {
        margin-left: 0;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}