/* リセット・基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 71, 87, 0.08) 0%, transparent 50%),
        linear-gradient(135deg, var(--warm-cream) 0%, #f8f4ff 100%);
    overflow-x: hidden;
    position: relative;
}

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

/* エモーショナル色パレット */
:root {
    --sunset-orange: #ff6b35;
    --sunset-pink: #ff4757;
    --sunset-purple: #5f27cd;
    --sunset-yellow: #feca57;
    --warm-cream: #fff5f5;
    --soft-brown: #2c2c54;
    --deep-orange: #ff3838;
    --light-peach: #fff2e6;
    --shadow-dark: rgba(44, 44, 84, 0.3);
    --shadow-light: rgba(255, 255, 255, 0.8);
    --text-dark: #2c2c54;
    --text-light: rgba(255, 255, 255, 0.95);
}

/* イントロ・ローディングセクション */
.intro-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 9999;
    background: linear-gradient(135deg, var(--sunset-orange) 0%, var(--sunset-pink) 50%, var(--sunset-purple) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 1s ease, visibility 1s ease;
}

.intro-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.intro-content {
    text-align: center;
    color: white;
}

.intro-text {
    font-family: 'Noto Serif JP', serif;
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1.5s ease;
}

.intro-subtitle {
    font-family: 'Noto Serif JP', serif;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--sunset-yellow);
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1.5s ease 0.5s both;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-placeholder-content {
    text-align: center;
    color: white;
}

#intro-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.sunset-animation {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--sunset-orange), var(--sunset-yellow));
    margin: 0 auto 1rem;
    animation: sunsetPulse 2s ease-in-out infinite;
    box-shadow: 0 0 30px rgba(255, 202, 87, 0.6);
}

@keyframes sunsetPulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.2); opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ヒーローセクション */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--sunset-orange) 0%, var(--sunset-pink) 50%, var(--sunset-purple) 100%);
    transition: opacity 1.5s ease;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 123, 58, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 107, 148, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(157, 78, 221, 0.2) 0%, transparent 70%);
    animation: sunsetShimmer 8s ease-in-out infinite;
}

.sunset-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        180deg, 
        rgba(255, 123, 58, 0.1) 0%, 
        rgba(255, 167, 38, 0.2) 30%, 
        rgba(255, 107, 148, 0.3) 70%, 
        rgba(157, 78, 221, 0.4) 100%
    );
    opacity: 0.8;
}

@keyframes sunsetShimmer {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 70vh;
    backdrop-filter: blur(10px);
    background: 
        linear-gradient(135deg, 
            rgba(255, 255, 255, 0.15) 0%, 
            rgba(255, 255, 255, 0.05) 100%);
    border-radius: 30px;
    padding: 3rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 40px 80px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.4);
    position: relative;
    overflow: hidden;
}

.hero-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 202, 87, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 71, 87, 0.1) 0%, transparent 50%);
    z-index: -1;
}

.hero-catchphrase {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.2rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-style: italic;
}

.hero-title {
    font-family: 'Noto Serif JP', serif;
    font-size: 2.8rem;
    font-weight: 700;
    color: white;
    line-height: 1.3;
    margin-bottom: 2rem;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.4);
}

.hero-title-small {
    font-size: 0.7em; /* 2レベルダウン */
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    display: inline-block;
    margin-bottom: 0.5rem;
}

.hero-title-large {
    font-size: 1.2em; /* 2レベルアップ */
    font-weight: 900;
    color: var(--sunset-yellow);
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.5), 0 0 20px rgba(255, 167, 38, 0.3);
    display: inline-block;
    line-height: 1.2;
}

.hero-subtitle {
    margin-bottom: 2rem;
}

.hero-subtitle p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle .emphasis {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--sunset-yellow);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
}

/* 書籍カバー */
.book-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-cover {
    perspective: 1000px;
    animation: bookFloat 6s ease-in-out infinite;
    display: block;
    text-decoration: none;
    transition: all 0.3s ease;
}

.book-cover:hover {
    transform: scale(1.02);
}

@keyframes bookFloat {
    0%, 100% { transform: translateY(0px) rotateY(-5deg); }
    50% { transform: translateY(-20px) rotateY(5deg); }
}

.book-cover-img {
    width: 280px;
    height: auto;
    max-height: 380px;
    border-radius: 15px;
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.4),
        0 10px 20px rgba(0, 0, 0, 0.2),
        inset 0 1px 3px rgba(255, 255, 255, 0.3);
    border: 3px solid rgba(255, 255, 255, 0.9);
    transition: all 0.3s ease;
    object-fit: cover;
}

.book-cover-img:hover {
    transform: scale(1.05) rotateY(10deg);
    box-shadow: 
        0 35px 70px rgba(0, 0, 0, 0.5),
        0 15px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 3px rgba(255, 255, 255, 0.4);
}

.book-placeholder {
    width: 280px;
    height: 380px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.3),
        inset 0 2px 10px rgba(255, 255, 255, 0.8);
    border: 3px solid rgba(255, 255, 255, 0.9);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.book-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        45deg, 
        rgba(255, 123, 58, 0.1) 0%, 
        rgba(255, 107, 148, 0.1) 50%, 
        rgba(157, 78, 221, 0.1) 100%
    );
    z-index: 1;
}

.book-placeholder > * {
    position: relative;
    z-index: 2;
}

.book-placeholder h3 {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--sunset-orange);
    line-height: 1.3;
    margin-bottom: 1rem;
    text-align: center;
}

.book-placeholder p {
    font-size: 1rem;
    color: var(--soft-brown);
    line-height: 1.4;
    text-align: center;
    margin-bottom: 2rem;
}

.book-placeholder .author {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--sunset-pink);
    text-align: center;
    margin-bottom: 0.5rem;
}

.book-placeholder .publisher {
    font-size: 0.9rem;
    color: var(--soft-brown);
    text-align: center;
}

/* CTA ボタン */
.hero-cta {
    position: relative;
    z-index: 2;
    text-align: center;
    margin-top: 2rem;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--sunset-yellow) 0%, var(--deep-orange) 100%);
    color: white;
    padding: 1.2rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    box-shadow: 0 10px 30px rgba(255, 167, 38, 0.4);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(255, 167, 38, 0.6);
    background: linear-gradient(135deg, var(--deep-orange) 0%, var(--sunset-orange) 100%);
}

.publication-date {
    margin-top: 1.5rem;
    font-size: 1.2rem;
    color: var(--sunset-yellow);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
    font-weight: 600;
    font-family: 'Noto Serif JP', serif;
    text-align: center;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    border: 1px solid rgba(255, 202, 87, 0.4);
    backdrop-filter: blur(10px);
    display: inline-block;
}

/* セクション共通スタイル */
.section-title {
    font-family: 'Noto Serif JP', serif;
    font-size: 2.8rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--sunset-orange) 0%, var(--sunset-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    text-shadow: none;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--sunset-orange) 0%, var(--sunset-pink) 100%);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* 著者セクション */
.author-section {
    padding: 100px 0;
    background: 
        linear-gradient(135deg, 
            rgba(255, 255, 245, 0.9) 0%, 
            rgba(248, 244, 255, 0.9) 100%),
        radial-gradient(circle at 10% 20%, rgba(255, 107, 53, 0.05) 0%, transparent 60%),
        radial-gradient(circle at 90% 80%, rgba(95, 39, 205, 0.05) 0%, transparent 60%);
    position: relative;
    overflow: hidden;
    border-top: 3px solid transparent;
    border-image: linear-gradient(90deg, var(--sunset-orange), var(--sunset-pink)) 1;
}

.author-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(255, 123, 58, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(255, 107, 148, 0.1) 0%, transparent 50%);
}

.author-content {
    position: relative;
    z-index: 2;
}

.author-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 3rem;
}

.author-profile-image {
    margin-bottom: 1.5rem;
}

.profile-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid rgba(255, 107, 53, 0.8);
    box-shadow: 
        0 15px 35px rgba(0, 0, 0, 0.2),
        0 0 20px rgba(255, 107, 53, 0.3);
    transition: all 0.3s ease;
}

.profile-img:hover {
    transform: scale(1.05);
    border-color: var(--sunset-yellow);
    box-shadow: 
        0 20px 45px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(255, 202, 87, 0.5);
}

.author-header h3 {
    font-family: 'Noto Serif JP', serif;
    font-size: 2.2rem;
    color: var(--sunset-orange);
    text-align: center;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.transformation {
    margin: 3rem 0;
    background: 
        linear-gradient(135deg, 
            rgba(255, 255, 255, 0.95) 0%, 
            rgba(248, 244, 255, 0.95) 100%);
    border-radius: 25px;
    padding: 3rem;
    box-shadow: 
        0 20px 50px rgba(0, 0, 0, 0.15),
        inset 0 1px 3px rgba(255, 255, 255, 0.8);
    border: 2px solid rgba(255, 255, 255, 0.6);
    position: relative;
    overflow: hidden;
}

.transformation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--sunset-orange) 0%, var(--sunset-pink) 50%, var(--sunset-purple) 100%);
}

.before-after {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: center;
}

.before, .after {
    text-align: center;
    padding: 2rem;
    border-radius: 20px;
    background: 
        linear-gradient(135deg, 
            rgba(255, 255, 255, 0.98) 0%, 
            rgba(255, 245, 245, 0.98) 100%);
    box-shadow: 
        0 15px 35px rgba(0, 0, 0, 0.12),
        inset 0 1px 2px rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.before:hover, .after:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.18),
        inset 0 1px 2px rgba(255, 255, 255, 0.9);
}

.before {
    border-left: 5px solid var(--sunset-pink);
}

.after {
    border-left: 5px solid var(--sunset-yellow);
}

.before h4, .after h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--soft-brown);
}

.overtime {
    font-size: 1.1rem;
    margin-top: 1rem;
}

.number {
    font-size: 2rem;
    font-weight: 900;
    color: var(--sunset-orange);
}

.arrow {
    font-size: 2rem;
    color: var(--sunset-orange);
    font-weight: bold;
}

.social-growth {
    margin: 3rem 0;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.social-growth h4 {
    font-size: 1.5rem;
    color: var(--sunset-orange);
    margin-bottom: 1.5rem;
    text-align: center;
}

.social-growth ul {
    list-style: none;
}

.social-growth li {
    padding: 0.5rem 0;
    font-size: 1rem;
    position: relative;
    padding-left: 2rem;
}

.social-growth li::before {
    content: '📈';
    position: absolute;
    left: 0;
    top: 0.5rem;
}

.author-message {
    background: linear-gradient(135deg, var(--sunset-orange) 0%, var(--sunset-pink) 100%);
    color: white;
    padding: 2rem;
    border-radius: 20px;
    font-family: 'Noto Serif JP', serif;
    font-size: 1.2rem;
    line-height: 1.8;
    text-align: center;
    margin: 3rem 0;
    box-shadow: 0 15px 35px rgba(255, 123, 58, 0.3);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* 書籍詳細セクション */
.book-details {
    padding: 80px 0;
    background: linear-gradient(135deg, #ffffff 0%, var(--warm-cream) 100%);
    position: relative;
}

.book-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.book-details h3 {
    font-family: 'Noto Serif JP', serif;
    font-size: 2rem;
    color: var(--sunset-orange);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.book-subtitle {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.8rem;
    color: var(--sunset-pink);
    margin-bottom: 2rem;
    font-weight: 500;
}

.story-intro {
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(255, 123, 58, 0.1);
    border-radius: 20px;
    border-left: 5px solid var(--sunset-orange);
}

.story-intro p {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    color: var(--soft-brown);
}

.book-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-10px);
}

.feature h4 {
    color: var(--sunset-orange);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.target-audience {
    margin: 3rem 0;
    text-align: left;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.target-audience h4 {
    font-size: 1.5rem;
    color: var(--sunset-orange);
    margin-bottom: 1.5rem;
    text-align: center;
}

.target-audience ul {
    list-style: none;
}

.target-audience li {
    padding: 0.8rem 0;
    font-size: 1.1rem;
    position: relative;
    padding-left: 2rem;
    line-height: 1.6;
}

.target-audience li::before {
    content: '🌅';
    position: absolute;
    left: 0;
    top: 0.8rem;
}

.book-promise {
    margin: 4rem 0;
    padding: 3rem;
    background: linear-gradient(135deg, var(--sunset-pink) 0%, var(--sunset-purple) 100%);
    border-radius: 30px;
    color: white;
    text-align: center;
    box-shadow: 0 20px 40px rgba(255, 107, 148, 0.3);
}

.promise-text {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.8rem;
    line-height: 1.6;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.promise-text .highlight {
    color: var(--sunset-yellow);
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
}

/* レビューセクション */
.reviews {
    padding: 100px 0;
    background: 
        linear-gradient(135deg, 
            rgba(255, 107, 53, 0.08) 0%, 
            rgba(255, 71, 87, 0.08) 50%,
            rgba(95, 39, 205, 0.08) 100%),
        linear-gradient(135deg, var(--warm-cream) 0%, #f0f8ff 100%);
    position: relative;
    border-top: 3px solid transparent;
    border-image: linear-gradient(90deg, var(--sunset-pink), var(--sunset-purple)) 1;
}

.reviews::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 15% 25%, rgba(255, 202, 87, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 85% 75%, rgba(255, 71, 87, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.review-card {
    background: 
        linear-gradient(135deg, 
            rgba(255, 255, 255, 0.98) 0%, 
            rgba(255, 250, 250, 0.98) 100%);
    padding: 2.5rem;
    border-radius: 25px;
    box-shadow: 
        0 20px 50px rgba(0, 0, 0, 0.12),
        inset 0 1px 3px rgba(255, 255, 255, 0.9);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 2px solid rgba(255, 255, 255, 0.8);
    position: relative;
    z-index: 2;
    overflow: hidden;
}

.review-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--sunset-orange) 0%, var(--sunset-pink) 100%);
}

.review-card::after {
    content: '💭';
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    opacity: 0.3;
    z-index: 1;
}

.review-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 
        0 35px 70px rgba(0, 0, 0, 0.18),
        inset 0 1px 3px rgba(255, 255, 255, 0.9);
}

.review-card:hover::after {
    opacity: 0.6;
    transform: scale(1.2);
    transition: all 0.3s ease;
}

.review-text p {
    font-size: 1rem;
    line-height: 1.7;
    color: #555;
    margin-bottom: 1.5rem;
}

.review-star {
    color: var(--sunset-yellow);
    font-size: 1.2rem;
}

/* 購入セクション */
.purchase-section {
    padding: 100px 0;
    background: 
        linear-gradient(135deg, var(--sunset-orange) 0%, var(--sunset-pink) 50%, var(--sunset-purple) 100%),
        radial-gradient(circle at 30% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.purchase-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 202, 87, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    animation: backgroundShimmer 8s ease-in-out infinite;
}

@keyframes backgroundShimmer {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

.purchase-section .section-title {
    color: white;
}

.purchase-section .section-title::after {
    background: linear-gradient(90deg, var(--sunset-yellow) 0%, white 100%);
}

.purchase-content {
    max-width: 600px;
    margin: 0 auto 3rem;
}

.book-info h3 {
    font-family: 'Noto Serif JP', serif;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.book-info .subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.book-details-info p {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.purchase-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
    margin: 2rem auto;
}

.btn-purchase {
    display: block;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-purchase.amazon {
    background: #ff9500;
    color: white;
    box-shadow: 0 8px 25px rgba(255, 149, 0, 0.4);
    border: 3px solid #ffffff;
}

.btn-purchase.amazon:hover {
    background: #e8850e;
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(255, 149, 0, 0.6);
    border-color: #ffd700;
}

.btn-purchase.rakuten {
    background: #bf0000;
    color: white;
    box-shadow: 0 8px 25px rgba(191, 0, 0, 0.4);
    border: 3px solid #ffffff;
}

.btn-purchase.rakuten:hover {
    background: #a60000;
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(191, 0, 0, 0.6);
    border-color: #ffd700;
}

.voicy-info {
    margin-top: 3rem;
    padding: 3rem;
    background: 
        linear-gradient(
            rgba(0, 0, 0, 0.6),
            rgba(0, 0, 0, 0.6)
        ),
        url('images/voicy.jpg') center 20%/cover;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.voicy-content {
    position: relative;
    z-index: 2;
}

.voicy-content h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8);
    font-weight: 700;
}

.voicy-content p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    font-weight: 500;
}

.btn-voicy {
    display: inline-block;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-dark);
    padding: 1rem 2.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: 3px solid rgba(255, 255, 255, 0.9);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-voicy:hover {
    background: var(--sunset-yellow);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
    border-color: var(--sunset-yellow);
}

/* フッター */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-book h4 {
    font-family: 'Noto Serif JP', serif;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--sunset-yellow);
}

.footer-author h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--sunset-pink);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    color: #bdc3c7;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    transform: translateY(-2px);
}

.social-icon {
    font-size: 1.1rem;
}

.footer-bottom {
    border-top: 1px solid #455a64;
    padding-top: 1rem;
    text-align: center;
    color: #bdc3c7;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-title-small {
        font-size: 0.65em;
    }
    
    .hero-title-large {
        font-size: 1.15em;
    }
    
    .book-placeholder {
        width: 220px;
        height: 300px;
        padding: 1.5rem;
    }
    
    .before-after {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .arrow {
        transform: rotate(90deg);
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .purchase-buttons {
        gap: 0.8rem;
    }
    
    .voicy-info {
        padding: 2rem;
    }
    
    .voicy-content h4 {
        font-size: 1.3rem;
    }
    
    .voicy-content p {
        font-size: 1rem;
    }
    
    .author-header {
        margin-bottom: 2rem;
    }
    
    .profile-img {
        width: 120px;
        height: 120px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-title-small {
        font-size: 0.6em;
    }
    
    .hero-title-large {
        font-size: 1.1em;
    }
    
    .publication-date {
        font-size: 1rem;
        padding: 0.8rem 1.5rem;
    }
    
    .hero-catchphrase {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .book-placeholder {
        width: 180px;
        height: 250px;
        padding: 1rem;
    }
    
    .book-placeholder h3 {
        font-size: 1.4rem;
    }
    
    .voicy-info {
        padding: 1.5rem;
    }
    
    .voicy-content h4 {
        font-size: 1.2rem;
    }
    
    .btn-voicy {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
}