/* ========================================
   漢字れんしゅう - スタイルシート
   ======================================== */

:root {
    /* カラーパレット */
    --color-primary: #4a90d9;
    --color-primary-dark: #3a7bc8;
    --color-primary-light: #e8f2fc;
    --color-accent: #ff7b54;
    --color-accent-dark: #e56a45;
    --color-success: #4caf50;
    --color-success-light: #e8f5e9;
    --color-warning: #ffc107;
    --color-bg: #faf9f7;
    --color-card: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #e0e0e0;
    
    /* フォント */
    --font-main: 'Zen Maru Gothic', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    
    /* サイズ */
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

/* ========================================
   ヘッダー
   ======================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0 1.5rem;
    border-bottom: 2px solid var(--color-border);
    margin-bottom: 1.5rem;
}

.title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
}

.admin-link {
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: all 0.2s;
}

.admin-link:hover {
    background: var(--color-card);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ========================================
   ステップセクション
   ======================================== */

.step {
    display: none;
    animation: fadeIn 0.3s ease;
}

.step.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1.25rem;
    color: var(--color-text);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 700;
}

/* ========================================
   チェックボックス・ラジオボタングリッド
   ======================================== */

.radio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.checkbox-card,
.radio-card {
    display: block;
    position: relative;
    cursor: pointer;
}

.checkbox-card input,
.radio-card input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.radio-label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s;
    min-height: 60px;
}

.checkbox-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s;
    min-height: 70px;
}

.checkbox-card input:checked + .checkbox-label,
.radio-card input:checked + .radio-label {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.checkbox-label:hover,
.radio-label:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.checkbox-label .unit-name {
    display: block;
    font-size: 1rem;
    line-height: 1.4;
}

.checkbox-label .grade-badge {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

/* ========================================
   ボタン
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--color-card);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-accent {
    background: var(--color-accent);
    color: white;
}

.btn-accent:hover:not(:disabled) {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ========================================
   情報テキスト
   ======================================== */

.info-text {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--color-primary-light);
    border-radius: var(--radius);
}

/* ========================================
   問題表示
   ======================================== */

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--color-border);
}

.quiz-progress {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-primary);
}

.question-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.question-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--color-primary-light);
    border-bottom: 1px solid var(--color-border);
}

.question-number {
    font-weight: 700;
    color: var(--color-primary);
}

.question-meta {
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

.question-content {
    padding: 1.25rem;
    font-size: 1.375rem;
    line-height: 2;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.question-content:hover {
    background: #f9f9f9;
}

.question-content:active {
    background: #f0f0f0;
}

/* 空欄表示（マス目） */
.blank-box {
    display: inline-block;
    text-align: center;
    vertical-align: baseline;
    margin: 0 4px;
    position: relative;
}

.blank-box .reading {
    position: absolute;
    bottom: calc(100% + 1px);
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65em;
    color: var(--color-accent);
    white-space: nowrap;
    line-height: 1;
}

.blank-box .boxes {
    display: inline-flex;
    gap: 2px;
}

.blank-box .box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5em;
    height: 1.5em;
    border: 2px solid var(--color-primary);
    background: white;
    vertical-align: middle;
    line-height: 1;
    padding-bottom: 0.05em;
}

.blank-box .answer-char {
    color: transparent;
    font-weight: 500;
    transition: color 0.3s;
    line-height: 1;
    margin-top: -0.05em;
}

/* 空欄表示（かっこ） */
.blank-bracket {
    display: inline-block;
    text-align: center;
    vertical-align: baseline;
    margin: 0 4px;
    position: relative;
}

.blank-bracket .reading {
    position: absolute;
    bottom: calc(100% + 1px);
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65em;
    color: var(--color-accent);
    white-space: nowrap;
    line-height: 1;
}

.blank-bracket .bracket-content {
    color: var(--color-primary);
    font-weight: 500;
}

.blank-bracket .answer-text {
    color: transparent;
    transition: color 0.3s;
    display: inline-block;
    min-width: 1.5em;
}

/* 解答表示時 */
.question-card.revealed .answer-char,
.question-card.revealed .answer-text {
    color: var(--color-accent);
}

.question-card.revealed .blank-box .box {
    background: var(--color-success-light);
    border-color: var(--color-success);
}

.question-card.revealed .blank-bracket .bracket-content {
    color: var(--color-success);
}

.tap-hint-header {
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

/* ========================================
   フッター
   ======================================== */

.quiz-footer {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
    padding-top: 1rem;
    border-top: 2px solid var(--color-border);
}

/* ========================================
   管理画面
   ======================================== */

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.admin-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.admin-nav {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    padding: 0.625rem 1.25rem;
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.tab-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.admin-section {
    display: none;
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.admin-section.active {
    display: block;
}

.section-title {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
}

/* テーブル */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.data-table th {
    background: var(--color-primary-light);
    font-weight: 500;
    color: var(--color-primary-dark);
}

.data-table tr:hover {
    background: #f9f9f9;
}

.data-table .actions {
    display: flex;
    gap: 0.5rem;
}

.data-table .btn-icon {
    padding: 0.375rem 0.625rem;
    font-size: 0.8125rem;
}

/* フォーム */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    font-family: inherit;
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

/* モーダル */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 2px solid var(--color-border);
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 500;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-light);
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-body {
    padding: 1.25rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--color-border);
}

/* アラート */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.alert-success {
    background: var(--color-success-light);
    color: #2e7d32;
    border: 1px solid #a5d6a7;
}

.alert-error {
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ef9a9a;
}

/* CSVセクション */
.csv-section {
    padding: 1.25rem;
    background: #f5f5f5;
    border-radius: var(--radius);
    margin-top: 1rem;
}

.csv-section h4 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.csv-format {
    font-family: monospace;
    font-size: 0.8125rem;
    background: var(--color-card);
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    overflow-x: auto;
}

/* ========================================
   レスポンシブ
   ======================================== */

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .checkbox-grid,
    .radio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .question-content {
        font-size: 1.25rem;
    }
    
    .admin-header {
        flex-direction: column;
        text-align: center;
    }
    
    .admin-nav {
        width: 100%;
        justify-content: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .data-table {
        font-size: 0.875rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.5rem;
    }
}