/* リセットとベース設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - 薄いピンク色を基調 */
    --primary-pink: #FFE4E1;
    --light-pink: #FFF0F5;
    --medium-pink: #FFB6C1;
    --dark-pink: #FF69B4;
    --accent-pink: #FF1493;
    
    /* テキストカラー */
    --text-dark: #333333;
    --text-medium: #666666;
    --text-light: #999999;
    
    /* その他のカラー */
    --white: #FFFFFF;
    --gray-light: #F5F5F5;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* フォント */
    --font-main: 'Noto Sans JP', sans-serif;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--light-pink);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー */
.header {
    background: linear-gradient(135deg, var(--primary-pink) 0%, var(--medium-pink) 100%);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.1); }
}

.header-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.header-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--white);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.header-description {
    font-size: 1.1rem;
    color: var(--white);
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* セクションタイトル */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: var(--dark-pink);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--medium-pink), transparent);
}

/* 統計セクション */
.stats-section {
    padding: 80px 0;
    background-color: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--light-pink) 0%, var(--primary-pink) 100%);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: rotate(45deg);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(255, 105, 180, 0.2);
}

.chart-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart {
    transform: rotate(-90deg);
}

.chart-background {
    stroke: rgba(255, 255, 255, 0.5);
}

.chart-bar {
    stroke: var(--accent-pink);
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset 2s ease-out;
    stroke-linecap: round;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-pink);
    position: absolute;
    /* top, left, width, height, display, align-items, justify-content は chart-container で制御 */
    margin: 0;
}

.stat-label {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 10px;
    margin-top: 10px; /* chart-containerとの間にスペースを確保 */
}

.stat-description {
    font-size: 0.9rem;
    color: var(--text-medium);
}

/* 受講生の声セクション */
.testimonials-section {
    padding: 80px 0;
    background-color: var(--gray-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

.testimonial-card {
    background: var(--white);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 5px 20px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.testimonial-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    padding: 2px;
    background: linear-gradient(135deg, var(--medium-pink), var(--primary-pink));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.testimonial-card:hover::before {
    opacity: 1;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(255, 105, 180, 0.15);
}

.testimonial-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--primary-pink);
}

.student-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark-pink);
}

.rating {
    display: flex;
    align-items: center;
    gap: 10px;
}

.rating-label {
    font-size: 0.9rem;
    color: var(--text-medium);
}

.stars {
    color: var(--accent-pink);
}

.stars i {
    margin: 0 2px;
}

.highlight-quote {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-dark);
    background: linear-gradient(135deg, var(--light-pink) 0%, var(--primary-pink) 100%);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    position: relative;
}

.highlight-quote::before {
    content: '"';
    font-size: 3rem;
    color: var(--medium-pink);
    position: absolute;
    top: -10px;
    left: 10px;
    opacity: 0.5;
}

.testimonial-details {
    margin-top: 20px;
}

.detail-item {
    margin-bottom: 15px;
    padding: 10px;
    background-color: var(--gray-light);
    border-radius: 8px;
    border-left: 3px solid var(--medium-pink);
}

.detail-item strong {
    color: var(--dark-pink);
}

.testimonial-text {
    margin-top: 20px;
    line-height: 1.8;
    color: var(--text-medium);
}

/* まとめセクション */
.summary-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-pink) 0%, var(--light-pink) 100%);
}

.summary-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.summary-text {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
}

.summary-text p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--text-dark);
}

.key-points {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
}

.key-points h3 {
    font-size: 1.5rem;
    color: var(--dark-pink);
    margin-bottom: 20px;
}

.key-points ul {
    list-style: none;
}

.key-points li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-medium);
}

.key-points li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-pink);
    font-weight: bold;
    font-size: 1.2rem;
}

/* フッター */
.footer {
    background-color: var(--dark-pink);
    color: var(--white);
    text-align: center;
    padding: 30px 0;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .header-title {
        font-size: 2rem;
    }
    
    .header-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .summary-content {
        grid-template-columns: 1fr;
    }

    .chart-container {
        width: 100px;
        height: 100px;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card,
.testimonial-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.2s; }
.stat-card:nth-child(3) { animation-delay: 0.3s; }
.stat-card:nth-child(4) { animation-delay: 0.4s; }

.testimonial-card:nth-child(1) { animation-delay: 0.1s; }
.testimonial-card:nth-child(2) { animation-delay: 0.2s; }
.testimonial-card:nth-child(3) { animation-delay: 0.3s; }
.testimonial-card:nth-child(4) { animation-delay: 0.4s; }
.testimonial-card:nth-child(5) { animation-delay: 0.5s; }
.testimonial-card:nth-child(6) { animation-delay: 0.6s; }