/* ===================================
   人生の主題歌 LP - ライトテーマ
   楽曲制作サービス版
   =================================== */

/* ----- Reset & Base ----- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-navy: #0F172A;
    --color-gold: #FBBF24;
    --color-light-gray: #E5E7EB;
    --color-bg: #F9FAFB;
    --color-white: #FFFFFF;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-success: #10B981;
    --color-error: #EF4444;
    
    /* Elegant Accents - 上質感のあるトーン */
    --color-dark-gold: #D4A574;
    --color-bronze: #CD7F32;
    --color-copper: #B87333;
    --color-champagne: #F7E7CE;
    --color-ivory: #FFFFF0;
    --color-warm-gray: #A89F91;
    
    /* Typography */
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

img {
    max-width: 100%;
    height: auto;
}

/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-navy);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, 
        var(--color-dark-gold), 
        var(--color-bronze), 
        var(--color-copper));
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* ----- Buttons ----- */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-sans);
}

.primary-cta {
    background: linear-gradient(135deg, 
        var(--color-dark-gold) 0%, 
        var(--color-bronze) 50%, 
        var(--color-gold) 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.4);
}

.primary-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(212, 165, 116, 0.6);
    background: linear-gradient(135deg, 
        var(--color-bronze) 0%, 
        var(--color-copper) 50%, 
        var(--color-gold) 100%);
}

.cta-center {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ----- Hero Section ----- */
.hero {
    position: relative;
    overflow: hidden;
    padding: 0;
    margin: 0;
}

.hero-image-link {
    display: block;
    width: 100%;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.hero-image-link:hover {
    opacity: 0.95;
}

.hero-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* デスクトップ・タブレット: 横長画像を表示 */
.hero-image-desktop {
    display: block;
}

.hero-image-mobile {
    display: none;
}

/* ----- Problem Section ----- */
.problem-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FDFBF7 0%, #F7F3ED 100%);
}

/* ----- Why Not AI Section ----- */
.why-not-ai-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #F5F1E8 0%, #EBE6DC 100%);
    position: relative;
}

.why-not-ai-section .section-intro {
    margin-bottom: var(--spacing-xl);
}

.why-not-ai-section .section-intro strong {
    color: var(--color-gold);
    font-size: 1.15rem;
}

.ai-comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.comparison-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(212, 165, 116, 0.3);
    transition: all 0.3s ease;
    position: relative;
    backdrop-filter: blur(10px);
}

/* AI比較カードに異なる淡い色 - ゴールド・ベージュ・セピア系のみ */
.comparison-card:nth-child(1) {
    background: rgba(255, 250, 240, 0.7); /* 淡いクリームゴールド */
}

.comparison-card:nth-child(2) {
    background: rgba(250, 240, 230, 0.7); /* 淡いセピアベージュ */
}

.comparison-card:nth-child(3) {
    background: rgba(245, 235, 224, 0.7); /* 淡いブロンズ */
}

.comparison-card:hover {
    border-color: var(--color-dark-gold);
    box-shadow: 0 8px 30px rgba(212, 165, 116, 0.25);
    transform: translateY(-5px);
}

.comparison-card:nth-child(1):hover {
    background: rgba(255, 250, 240, 0.95);
}

.comparison-card:nth-child(2):hover {
    background: rgba(250, 240, 230, 0.95);
}

.comparison-card:nth-child(3):hover {
    background: rgba(245, 235, 224, 0.95);
}

.comparison-icon {
    font-size: 3rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.comparison-card:nth-child(1) .comparison-icon {
    color: var(--color-bronze);
}

.comparison-card:nth-child(2) .comparison-icon {
    color: var(--color-dark-gold);
}

.comparison-card:nth-child(3) .comparison-icon {
    color: var(--color-copper);
}

.comparison-card h3 {
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
    text-align: center;
    font-weight: 600;
    border-bottom: 2px solid var(--color-light-gray);
    padding-bottom: var(--spacing-sm);
}

.comparison-content {
    text-align: left;
}

.comparison-content p {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.comparison-content strong {
    color: var(--color-navy);
    font-weight: 600;
}

.highlight-box {
    background: rgba(251, 191, 36, 0.1);
    border-left: 3px solid var(--color-gold);
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    font-weight: 600;
    color: var(--color-navy) !important;
}

.comparison-content .conclusion {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px dashed var(--color-light-gray);
    font-weight: 500;
    color: var(--color-navy) !important;
    font-style: italic;
}

.ai-conclusion {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    border: 2px solid var(--color-gold);
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.1);
}

.conclusion-text {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.conclusion-text strong {
    color: var(--color-navy);
    font-weight: 700;
}

.conclusion-emphasis {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-top: var(--spacing-md);
    font-family: var(--font-serif);
    line-height: 1.7;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.problem-card {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(212, 165, 116, 0.3);
    backdrop-filter: blur(10px);
}

/* 各カードに異なる淡い色を適用 - ゴールド・ベージュ・セピア系のみ */
.problem-card:nth-child(1) {
    background: rgba(255, 248, 235, 0.6); /* 淡いゴールドクリーム */
}

.problem-card:nth-child(2) {
    background: rgba(255, 243, 224, 0.6); /* 淡いゴールド */
}

.problem-card:nth-child(3) {
    background: rgba(250, 240, 230, 0.6); /* 淡いセピア */
}

.problem-card:nth-child(4) {
    background: rgba(252, 245, 235, 0.6); /* 淡いベージュ */
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(212, 165, 116, 0.2);
    border-color: var(--color-dark-gold);
}

.problem-card:nth-child(1):hover {
    background: rgba(255, 248, 235, 0.9);
}

.problem-card:nth-child(2):hover {
    background: rgba(255, 243, 224, 0.9);
}

.problem-card:nth-child(3):hover {
    background: rgba(250, 240, 230, 0.9);
}

.problem-card:nth-child(4):hover {
    background: rgba(252, 245, 235, 0.9);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.problem-card:nth-child(1) .problem-icon {
    color: var(--color-dark-gold);
}

.problem-card:nth-child(2) .problem-icon {
    color: var(--color-bronze);
}

.problem-card:nth-child(3) .problem-icon {
    color: var(--color-copper);
}

.problem-card:nth-child(4) .problem-icon {
    color: var(--color-dark-gold);
}

.problem-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.problem-card p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-light);
}

/* ----- About Section ----- */
.about-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FDFBF7 0%, #F9F6F0 100%);
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-dark-gold);
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
    transition: all 0.3s ease;
}

/* 診断紹介の各アイテムに淡い色 - ゴールド・ベージュ・セピア系のみ */
.feature-item:nth-child(1) {
    background: rgba(255, 251, 240, 0.7); /* 淡いアンバークリーム */
}

.feature-item:nth-child(2) {
    background: rgba(255, 250, 240, 0.7); /* 淡いクリーム */
}

.feature-item:nth-child(3) {
    background: rgba(250, 245, 235, 0.7); /* 淡いウォームベージュ */
}

.feature-item:hover {
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.15);
    transform: translateY(-3px);
}

.feature-number {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-gold);
    background: rgba(251, 191, 36, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    margin-bottom: var(--spacing-sm);
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.feature-item p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

/* ----- Benefits Section ----- */
.benefits-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #F7F3ED 0%, #F0EBE1 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.benefit-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(212, 165, 116, 0.2);
}

/* Benefitsカードに淡い色 - ゴールド・ベージュ・セピア系のみ */
.benefit-card:nth-child(1) {
    background: rgba(252, 245, 235, 0.7); /* 淡いゴールデンベージュ */
}

.benefit-card:nth-child(2) {
    background: rgba(255, 248, 230, 0.7); /* 淡いハニーゴールド */
}

.benefit-card:nth-child(3) {
    background: rgba(248, 240, 230, 0.7); /* 淡いサンドベージュ */
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(212, 165, 116, 0.2);
}

.benefit-card:nth-child(1):hover {
    background: rgba(252, 245, 235, 0.95);
}

.benefit-card:nth-child(2):hover {
    background: rgba(255, 248, 230, 0.95);
}

.benefit-card:nth-child(3):hover {
    background: rgba(248, 240, 230, 0.95);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.benefit-card:nth-child(1) .benefit-icon {
    color: var(--color-dark-gold);
}

.benefit-card:nth-child(2) .benefit-icon {
    color: var(--color-bronze);
}

.benefit-card:nth-child(3) .benefit-icon {
    color: var(--color-copper);
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.benefit-card p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-light);
}

/* ----- How It Works Section ----- */
.how-it-works-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FDFBF7 0%, #F7F3ED 100%);
}

.steps {
    max-width: 700px;
    margin: var(--spacing-lg) auto 0;
}

.step-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(212, 165, 116, 0.2);
}

/* ステップアイテムに淡い色 - ゴールド・ベージュ・セピア系のみ */
.step-item:nth-child(1) {
    background: rgba(255, 251, 240, 0.7); /* 淡いアンバー */
}

.step-item:nth-child(3) {
    background: rgba(252, 246, 238, 0.7); /* 淡いエクリュ */
}

.step-item:nth-child(5) {
    background: rgba(250, 240, 230, 0.7); /* 淡いベージュ */
}

.step-item:hover {
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.15);
    transform: translateY(-3px);
}

.step-number {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.step-item:nth-child(1) .step-number {
    background: linear-gradient(135deg, var(--color-dark-gold), var(--color-bronze));
}

.step-item:nth-child(3) .step-number {
    background: linear-gradient(135deg, var(--color-bronze), var(--color-copper));
}

.step-item:nth-child(5) .step-number {
    background: linear-gradient(135deg, var(--color-copper), var(--color-gold));
}

.step-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-navy);
}

.step-content p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-light);
}

.step-arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--color-gold);
    margin: var(--spacing-sm) 0;
}

/* ----- Who Is For Section ----- */
.who-is-for-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #F5F1E8 0%, #EBE6DC 100%);
}

.who-list {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

.who-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
}

.who-item:hover {
    background: var(--color-white);
    box-shadow: 0 4px 15px rgba(15, 23, 42, 0.08);
    transform: translateX(5px);
}

.who-item i {
    color: var(--color-gold);
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 0.2rem;
}

.who-item p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
}

/* ----- Author Section ----- */
.author-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FDFBF7 0%, #F9F6F0 100%);
}

.author-profiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.author-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(212, 165, 116, 0.2);
}

/* 監修者カードに淡い色 - ゴールド・ベージュ・セピア系のみ */
.author-card:nth-child(1) {
    background: rgba(255, 248, 225, 0.7); /* 淡いゴールデンイエロー */
}

.author-card:nth-child(2) {
    background: rgba(250, 243, 230, 0.7); /* 淡いクリームベージュ */
}

.author-card:hover {
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.15);
    transform: translateY(-3px);
}

.author-image-placeholder {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-light-gray), var(--color-bg));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--color-gold);
    opacity: 0.3;
}

.author-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-navy);
}

.author-role {
    display: block;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
    font-family: var(--font-sans);
}

.author-bio {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text-light);
    text-align: left;
    margin-top: var(--spacing-sm);
}

.author-link {
    margin-top: var(--spacing-sm);
    text-align: left;
}

.author-link a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-navy);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border-bottom: 2px solid var(--color-dark-gold);
    padding-bottom: 0.2rem;
}

.author-link a:hover {
    color: var(--color-bronze);
    border-bottom-color: var(--color-bronze);
    transform: translateX(3px);
}

.author-link a i {
    font-size: 0.85rem;
}

.concept-story {
    background: rgba(255, 250, 245, 0.7); /* 淡いアイボリーゴールド */
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-dark-gold);
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
    transition: all 0.3s ease;
}

.concept-story:hover {
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.15);
}

.concept-story h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.concept-story h3 i {
    color: var(--color-gold);
    font-size: 1rem;
}

.concept-story p {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--color-text-light);
}

/* ----- FAQ Section ----- */
.faq-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #F7F3ED 0%, #F0EBE1 100%);
}

.faq-list {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

.faq-item {
    background: rgba(250, 248, 246, 0.7); /* 淡いウォームホワイト */
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
    border: 1px solid rgba(212, 165, 116, 0.2);
    transition: all 0.3s ease;
}

.faq-item:hover {
    background: rgba(250, 248, 246, 0.95);
    box-shadow: 0 4px 15px rgba(212, 165, 116, 0.15);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-navy);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-sans);
}

.faq-question:hover {
    background: var(--color-white);
}

.faq-question i {
    color: var(--color-gold);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

/* ----- Form Section ----- */
.form-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FDFBF7 0%, #F7F3ED 100%);
}

.form-container {
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
    background: rgba(255, 253, 248, 0.8); /* 淡いアイボリークリーム */
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(212, 165, 116, 0.3);
    backdrop-filter: blur(10px);
}

.diagnosis-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.required {
    color: var(--color-error);
    font-size: 0.85rem;
    margin-left: var(--spacing-xs);
}

.form-group input,
.form-group select {
    padding: 0.9rem;
    border: 2px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-gold);
    box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.1);
}

.checkbox-group {
    flex-direction: row;
    align-items: flex-start;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-weight: 400;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 0.2rem;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.error-message {
    color: var(--color-error);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    display: none;
}

.form-group.error .error-message {
    display: block;
}

.form-group.error input,
.form-group.error select {
    border-color: var(--color-error);
}

.submit-button {
    margin-top: var(--spacing-sm);
    width: 100%;
    padding: 1.2rem;
    font-size: 1.1rem;
}

.form-note {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-md);
}

.thank-you-message {
    text-align: center;
    padding: var(--spacing-lg);
}

.thank-you-icon {
    font-size: 4rem;
    color: var(--color-success);
    margin-bottom: var(--spacing-md);
}

.thank-you-message h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.thank-you-message p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

/* ----- Footer ----- */
.footer {
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    margin-bottom: var(--spacing-sm);
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-white);
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.3s ease;
    font-size: 0.9rem;
}

.footer-links a:hover {
    opacity: 1;
}

/* ----- Animations ----- */
.fade-in-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
    .hero {
        padding: 0;
    }
    
    .hero-image {
        width: 100%;
        height: auto;
    }
    
    /* モバイル: 縦長画像を表示 */
    .hero-image-desktop {
        display: none;
    }
    
    .hero-image-mobile {
        display: block;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .sub-headline {
        font-size: 1.1rem;
    }
    
    .section-intro {
        font-size: 1rem;
    }
    
    .composer-credit {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
    }
    
    .composer-credit i {
        font-size: 2rem;
    }
    
    .credit-content {
        text-align: center;
    }
    
    .trust-elements {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .problem-grid,
    .benefits-grid,
    .author-profiles {
        grid-template-columns: 1fr;
    }
    
    .step-item {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto;
    }
    
    .cta-button {
        padding: 1rem 1.8rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .hero {
        padding: 0;
    }
    
    .hero-image {
        width: 100%;
        height: auto;
    }
    
    .problem-section,
    .about-section,
    .benefits-section,
    .how-it-works-section,
    .who-is-for-section,
    .author-section,
    .faq-section,
    .form-section {
        padding: var(--spacing-lg) 0;
    }
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}