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


/* 基本設定 */
:root {
--primary-color: #3b82f6;
--secondary-color: #1e40af;
--success-color: #10b981;
--danger-color: #ef4444;
--warning-color: #f59e0b;
--gray-100: #f3f4f6;
--gray-200: #e5e7eb;
--gray-300: #d1d5db;
--gray-400: #9ca3af;
--gray-500: #6b7280;
--gray-600: #4b5563;
--gray-700: #374151;
--gray-800: #1f2937;
--gray-900: #111827;
--white: #ffffff;
--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
--border-radius: 8px;
--border-radius-lg: 12px;
--transition: all 0.3s ease;
}
body {
font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
line-height: 1.6;
color: var(--gray-800);
 
min-height: 100vh;
}
/* ========================================
ヘッダー
======================================== */
.header1 {
background: rgba(255, 255, 255, 0.95);
backdrop-filter: blur(10px);
padding: 2rem 0;
text-align: center;
box-shadow: var(--shadow-md);
position: sticky;
top: 0;
/* z-index: 100; */
}
/* .header-content {
max-width: 1200px;
margin: 0 auto;
padding: 0 1rem;
} */
.site-title {
font-size: 2.5rem;
font-weight: 700;
 background: linear-gradient(135deg, #04569e 0%, #041c2e 100%);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
margin-bottom: 0.5rem;
}
.site-subtitle {
font-size: 1.2rem;
color: var(--gray-600);
font-weight: 400;
}
/* ========================================
メインコンテナ
======================================== */
.main-container {
/* max-width: 1200px; */
margin: 0 auto;
padding: 2rem 1rem;
background: linear-gradient(135deg, #04569e 0%, #041c2e 100%);
}
.section-title {
font-size: 2rem;
font-weight: 600;
text-align: center;
margin-bottom: 2rem;
color: #000;
text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}
/* ========================================
科目選択セクション
======================================== */
.selection-container {
background: rgba(255, 255, 255, 0.95);
backdrop-filter: blur(10px);
border-radius: var(--border-radius-lg);
padding: 3rem;
box-shadow: var(--shadow-xl);
}
.subject-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: 2rem;
margin-bottom: 3rem;
}
.subject-card {
background: var(--white);
border-radius: var(--border-radius-lg);
padding: 2rem;
text-align: center;
cursor: pointer;
transition: var(--transition);
box-shadow: var(--shadow-md);
border: 2px solid transparent;
position: relative;
overflow: hidden;
}
.subject-card::before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
height: 4px;
 background: linear-gradient(135deg, #04569e 0%, #041c2e 100%);
transform: scaleX(0);
transition: transform 0.3s ease;
}
.subject-card:hover {
transform: translateY(-5px);
box-shadow: var(--shadow-xl);
border-color: var(--primary-color);
}
.subject-card:hover::before {
transform: scaleX(1);
}
.subject-icon {
font-size: 3rem;
margin-bottom: 1rem;
}
.subject-name {
font-size: 1.5rem;
font-weight: 600;
margin-bottom: 0.5rem;
color: var(--gray-800);
}
.subject-description {
color: var(--gray-600);
margin-bottom: 1rem;
font-size: 0.9rem;
}
.card-count {
background: var(--primary-color);
color: var(--white);
padding: 0.5rem 1rem;
border-radius: 20px;
font-weight: 600;
display: inline-block;
margin-bottom: 1rem;
}
.progress-info {
color: var(--gray-500);
font-size: 0.9rem;
}
/* ========================================
学習統計
======================================== */
.stats-container {
background: var(--gray-100);
border-radius: var(--border-radius-lg);
padding: 2rem;
margin-top: 2rem;
}
.stats-container h3 {
text-align: center;
margin-bottom: 1.5rem;
color: var(--gray-800);
font-size: 1.3rem;
}
.stats-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
gap: 1.5rem;
}
.stat-item {
text-align: center;
background: var(--white);
padding: 1.5rem;
border-radius: var(--border-radius);
box-shadow: var(--shadow-sm);
}
.stat-number {
font-size: 2rem;
font-weight: 700;
color: var(--primary-color);
margin-bottom: 0.5rem;
}
.stat-label {
color: var(--gray-600);
font-size: 0.9rem;
}
/* ========================================
モード選択セクション
======================================== */
.mode-container {
background: rgba(255, 255, 255, 0.95);
backdrop-filter: blur(10px);
border-radius: var(--border-radius-lg);
padding: 3rem;
box-shadow: var(--shadow-xl);
}
.back-btn {
background: var(--gray-200);
color: var(--gray-700);
border: none;
padding: 0.75rem 1.5rem;
border-radius: var(--border-radius);
cursor: pointer;
transition: var(--transition);
font-weight: 500;
margin-bottom: 2rem;
}
.back-btn:hover {
background: var(--gray-300);
}
.selected-subject-info {
text-align: center;
margin-bottom: 2rem;
}
.subject-badge {
background: var(--primary-color);
color: var(--white);
padding: 0.5rem 1rem;
border-radius: 20px;
font-size: 0.9rem;
margin-right: 0.5rem;
}
.subject-title {
font-size: 1.2rem;
font-weight: 600;
color: var(--gray-800);
}
.mode-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 2rem;
}
.mode-card {
background: var(--white);
border-radius: var(--border-radius-lg);
padding: 2rem;
text-align: center;
cursor: pointer;
transition: var(--transition);
box-shadow: var(--shadow-md);
border: 2px solid transparent;
}
.mode-card:hover {
transform: translateY(-3px);
box-shadow: var(--shadow-lg);
border-color: var(--primary-color);
}
.mode-icon {
font-size: 2.5rem;
margin-bottom: 1rem;
}
.mode-name {
font-size: 1.3rem;
font-weight: 600;
margin-bottom: 0.5rem;
color: var(--gray-800);
}
.mode-description {
color: var(--gray-600);
font-size: 0.9rem;
}
/* ========================================
暗記カードセクション
======================================== */
.flashcard-container {
background: rgba(255, 255, 255, 0.95);
backdrop-filter: blur(10px);
border-radius: var(--border-radius-lg);
padding: 2rem;
box-shadow: var(--shadow-xl);
min-height: 80vh;
}
.study-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 2rem;
flex-wrap: wrap;
gap: 1rem;
}
.study-info {
text-align: center;
flex: 1;
}
.current-subject,
.current-mode {
background: var(--primary-color);
color: var(--white);
padding: 0.5rem 1rem;
border-radius: 20px;
font-size: 0.9rem;
margin: 0 0.25rem;
}
.card-counter {
font-size: 1.1rem;
font-weight: 600;
color: var(--gray-700);
}
/* 進捗バー */
.progress-container {
display: flex;
align-items: center;
gap: 1rem;
margin-bottom: 2rem;
}
.progress-bar {
flex: 1;
height: 8px;
background: var(--gray-200);
border-radius: 4px;
overflow: hidden;
}
.progress-fill {
height: 100%;
 background: linear-gradient(135deg, #04569e 0%, #041c2e 100%);
width: 0%;
transition: width 0.5s ease;
}
.progress-percentage {
font-weight: 600;
color: var(--gray-700);
min-width: 50px;
}
/* タイマー */
.timer-container {
text-align: center;
margin-bottom: 2rem;
}
.timer {
background: var(--warning-color);
color: var(--white);
padding: 1rem 2rem;
border-radius: var(--border-radius-lg);
font-size: 1.2rem;
font-weight: 600;
display: inline-block;
animation: pulse 1s infinite;
}
@keyframes pulse {
0%, 100% { transform: scale(1); }
50% { transform: scale(1.05); }
}
/* ========================================
フラッシュカード
======================================== */
.card-stage {
display: flex;
justify-content: center;
margin-bottom: 2rem;
perspective: 1000px;
}
.flashcard {
width: 100%;
max-width: 600px;
height: 400px;
position: relative;
transform-style: preserve-3d;
transition: transform 0.6s ease;
cursor: pointer;
}
.flashcard.flipped {
transform: rotateY(180deg);
}
.card-face {
position: absolute;
width: 100%;
height: 100%;
backface-visibility: hidden;
border-radius: var(--border-radius-lg);
display: flex;
align-items: center;
justify-content: center;
padding: 2rem;
box-shadow: var(--shadow-lg);
border: 3px solid var(--gray-200);
}
.card-front {
 background: linear-gradient(135deg, #04569e 0%, #041c2e 100%);
color: var(--white);
}
.card-back {
 background: linear-gradient(135deg, #e8edf0 0%, #46515a 100%);
color: #000;
transform: rotateY(180deg);
}
.card-content {
text-align: center;
width: 100%;
}
.card-type {
font-size: 1.5rem;
font-weight: 600;
margin-bottom: 1.5rem;
opacity: 0.9;
text-transform: uppercase;
letter-spacing: 1px;
}
.question-text,
.answer-text {
font-size: 1.5rem;
font-weight: 600;
line-height: 1.4;
margin-bottom: 1.5rem;
}
.explanation-text {
font-size: 1rem;
line-height: 1.6;
opacity: 0.9;
margin-top: 1rem;
padding-top: 1rem;
border-top: 1px solid rgba(255, 255, 255, 0.3);
}
.flip-instruction {
font-size: 0.9rem;
opacity: 0.8;
margin-top: 1rem;
animation: bounce 2s infinite;
}
@keyframes bounce {
0%, 20%, 53%, 80%, 100% { transform: translateY(0); }
40%, 43% { transform: translateY(-10px); }
70% { transform: translateY(-5px); }
90% { transform: translateY(-2px); }
}
/* ========================================
コントロールボタン
======================================== */
.control-buttons {
display: flex;
justify-content: center;
gap: 1rem;
margin-bottom: 2rem;
flex-wrap: wrap;
}
.control-btn {
padding: 1rem 2rem;
border: none;
border-radius: var(--border-radius-lg);
font-weight: 600;
cursor: pointer;
transition: var(--transition);
font-size: 1rem;
min-width: 120px;
}
.incorrect-btn {
background: var(--danger-color);
color: var(--white);
}
.incorrect-btn:hover {
background: #dc2626;
transform: translateY(-2px);
}
.flip-btn {
background: var(--gray-600);
color: var(--white);
}
.flip-btn:hover {
background: var(--gray-700);
transform: translateY(-2px);
}
.correct-btn {
background: var(--success-color);
color: var(--white);
}
.correct-btn:hover {
background: #059669;
transform: translateY(-2px);
}
/* ナビゲーションボタン */
.navigation-buttons {
display: flex;
justify-content: space-between;
gap: 1rem;
}
.nav-btn {
padding: 0.75rem 1.5rem;
background: var(--primary-color);
color: var(--white);
border: none;
border-radius: var(--border-radius);
cursor: pointer;
transition: var(--transition);
font-weight: 500;
}
.nav-btn:hover {
background: var(--secondary-color);
transform: translateY(-2px);
}
.nav-btn:disabled {
background: var(--gray-400);
cursor: not-allowed;
transform: none;
}
/* ========================================
モーダル
======================================== */
.modal-overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
display: flex;
justify-content: center;
align-items: center;
z-index: 1000;
backdrop-filter: blur(5px);
}
.modal-content {
background: var(--white);
border-radius: var(--border-radius-lg);
padding: 3rem;
max-width: 500px;
width: 90%;
text-align: center;
box-shadow: var(--shadow-xl);
}
.modal-content h3 {
font-size: 2rem;
margin-bottom: 2rem;
color: var(--gray-800);
}
.completion-stats {
margin-bottom: 2rem;
}
.completion-stat {
display: flex;
justify-content: space-between;
margin-bottom: 1rem;
padding: 0.5rem 0;
border-bottom: 1px solid var(--gray-200);
}
.stat-label {
color: var(--gray-600);
}
.stat-value {
font-weight: 600;
color: var(--gray-800);
}
.modal-buttons {
display: flex;
flex-direction: column;
gap: 1rem;
}
.modal-btn {
padding: 1rem 2rem;
border: none;
border-radius: var(--border-radius);
cursor: pointer;
font-weight: 600;
transition: var(--transition);
}
.retry-btn {
background: var(--primary-color);
color: var(--white);
}
.retry-btn:hover {
background: var(--secondary-color);
}
.review-incorrect-btn {
background: var(--warning-color);
color: var(--white);
}
.review-incorrect-btn:hover {
background: #d97706;
}
.back-to-subjects-btn {
background: var(--gray-600);
color: var(--white);
}
.back-to-subjects-btn:hover {
background: var(--gray-700);
}
/* ========================================
フッター
======================================== */
.footer {
text-align: center;
padding: 2rem;
color: var(--white);
margin-top: 2rem;
}
.footer-content {
max-width: 1200px;
margin: 0 auto;
}

/* 追加 */
.sub-categories {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e5e7eb;
}

.sub-category {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    margin: 5px 0;
    background: #f8f9fa;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sub-category:hover {
    background: #e3f2fd;
    transform: translateX(5px);
}

.sub-icon {
    margin-right: 8px;
}

.sub-name {
    flex: 1;
    font-weight: 500;
}

.sub-count {
    font-size: 0.9rem;
    color: #6b7280;
}


/* ========================================
レスポンシブデザイン
======================================== */
@media (max-width: 768px) {
.site-title {
font-size: 2rem;
}
.site-subtitle {
    font-size: 1rem;
}

.selection-container,
.mode-container,
.flashcard-container {
    padding: 1.5rem;
}

.subject-grid,
.mode-grid {
    grid-template-columns: 1fr;
}

.stats-grid {
    grid-template-columns: repeat(2, 1fr);
}

.study-header {
    flex-direction: column;
    text-align: center;
}

.flashcard {
    height: 350px;
}

.question-text,
.answer-text {
    font-size: 1.2rem;
}

.control-buttons {
    flex-direction: column;
    align-items: center;
}

.control-btn {
    width: 100%;
    max-width: 250px;
}

.navigation-buttons {
    flex-direction: column;
}

.modal-content {
    padding: 2rem;
}
}
@media (max-width: 480px) {
.main-container {
padding: 1rem;
}
.site-title {
    font-size: 1.5rem;
}

.selection-container,
.mode-container,
.flashcard-container {
    padding: 1rem;
}

.flashcard {
    height: 300px;
}

.card-face {
    padding: 1rem;
}

.question-text,
.answer-text {
    font-size: 1.1rem;
}

.stats-grid {
    grid-template-columns: 1fr;
}
}
/* ========================================
アニメーション・エフェクト
======================================== */
.fade-in {
animation: fadeIn 0.5s ease-in;
}
@keyframes fadeIn {
from { opacity: 0; transform: translateY(20px); }
to { opacity: 1; transform: translateY(0); }
}
.slide-in {
animation: slideIn 0.5s ease-out;
}
@keyframes slideIn {
from { opacity: 0; transform: translateX(-50px); }
to { opacity: 1; transform: translateX(0); }
}
.scale-in {
animation: scaleIn 0.3s ease-out;
}
@keyframes scaleIn {
from { transform: scale(0.9); opacity: 0; }
to { transform: scale(1); opacity: 1; }
}
/* 成功・失敗のフィードバック */
.success-flash {
animation: successFlash 0.5s ease;
}
@keyframes successFlash {
0% { background-color: var(--success-color); }
100% { background-color: transparent; }
}
.error-flash {
animation: errorFlash 0.5s ease;
}
@keyframes errorFlash {
0% { background-color: var(--danger-color); }
100% { background-color: transparent; }
}
/* ローディングスピナー */
.loading-spinner {
border: 4px solid var(--gray-200);
border-top: 4px solid var(--primary-color);
border-radius: 50%;
width: 50px;
height: 50px;
animation: spin 1s linear infinite;
margin: 2rem auto;
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}