:root {
    --primary-teal: #4FD1C7;
    --primary-teal-dark: #38B2AC;
    --primary-teal-light: #B2F5EA;
    --secondary-blue: #4299E1;
    --text-primary: #2D3748;
    --text-secondary: #4A5568;
    --text-tertiary: #718096;
    --background-white: #FFFFFF;
    --background-gray: #F7FAFC;
    --background-light: #EDF2F7;
    --border-color: #E2E8F0;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.12);
    --radius-small: 8px;
    --radius-medium: 16px;
    --radius-large: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: #FFFFFF;
    min-height: 100vh;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--background-white);
    min-height: 100vh;
    box-shadow: var(--shadow-light);
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 18px;
    position: relative;
    z-index: 101;
}

.hamburger span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text-primary);
    margin-bottom: 4px;
    transition: all 0.3s ease;
    border-radius: 1px;
}

.hamburger span:last-child {
    margin-bottom: 0;
}

/* ハンバーガーメニューのアニメーション */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--primary-teal);
}

/* Hero Section */
.hero {
    padding: 80px 32px 120px;
    text-align: center;
    background: var(--primary-teal);
    display: flex;
    align-items: center;
    min-height: 60vh;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    width: 100%;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    color: #FFFFFF;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-meta {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-bottom: 40px;
}

.hero-intro {
    background: var(--background-white);
    padding: 32px;
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-medium);
    font-size: 18px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    margin-bottom: -3%;
}

/* Main Content */
.main-content {
    padding: 80px 32px;
    max-width: 800px;
    margin: 0 auto;
}

.section {
    margin-bottom: 80px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.section-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.reference-link {
    color: var(--primary-teal);
    text-decoration: none;
    border-bottom: 1px dotted var(--primary-teal);
    transition: all 0.2s ease;
}

.reference-link:hover {
    color: var(--primary-teal-dark);
    border-bottom-style: solid;
}

.highlight-card {
    background: var(--primary-teal-light);
    border: 1px solid rgba(79, 209, 199, 0.3);
    border-radius: var(--radius-medium);
    padding: 32px;
    margin: 32px 0;
}

.highlight-card strong {
    color: var(--primary-teal-dark);
    font-weight: 600;
}

.warning-box {
    background: #FFF5F5;
    border: 2px solid #FEB2B2;
    border-radius: var(--radius-medium);
    padding: 32px;
    margin: 30px 0;
    margin-bottom: 100px; /* 下のマージンのみ60pxに変更 */
}

.warning-box .warning-title {
    color: #C53030;
    font-weight: 600;
    margin-bottom: 16px;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.warning-box p {
    color: #C53030;
    line-height: 1.7;
    margin-bottom: 12px;
}

.evidence-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.evidence-card {
    background: var(--background-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 32px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%; /* カード全体の高さを統一 */
}

.evidence-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-teal);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.evidence-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-teal);
}

.evidence-card:hover::before {
    transform: scaleX(1);
}

.evidence-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-teal-light);
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.evidence-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.evidence-description {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 16px;
    flex-grow: 1; /* 説明文が残りのスペースを埋める */
}

.evidence-link {
    display: inline-block;
    color: var(--primary-teal);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    background: var(--primary-teal-light);
    border-radius: var(--radius-small);
    transition: all 0.3s ease;
    margin-top: auto; /* ボタンを下に配置 */
}

.evidence-link:hover {
    background: var(--primary-teal);
    color: white;
}

.quote-box {
    background: var(--background-gray);
    border-left: 4px solid var(--primary-teal);
    padding: 24px 32px;
    margin: 32px 0;
    border-radius: var(--radius-small);
    font-style: italic;
    color: var(--text-secondary);
}

.list-styled {
    list-style: none;
    margin: 24px 0;
}

.list-styled li {
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.6;
}

.list-styled li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 12px;
    color: var(--primary-teal);
    font-weight: 600;
    font-size: 16px;
}

/* Author Section */
.author-section {
    background: var(--background-gray);
    padding: 40px;
    border-radius: var(--radius-medium);
    margin: 60px 0;
    border: 1px solid var(--border-color);
}

.author-section h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.author-content {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.author-image {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-medium);
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid var(--border-color);
}

.author-text {
    flex: 1;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

/* Reference Section */
.references {
    background: var(--background-gray);
    padding: 40px;
    border-radius: var(--radius-medium);
    margin: 60px 0;
}

.references h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.references ol {
    counter-reset: ref-counter;
    list-style: none;
    padding-left: 0;
}

.references li {
    counter-increment: ref-counter;
    margin-bottom: 12px;
    padding-left: 30px;
    position: relative;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-secondary);
}

.references li::before {
    content: counter(ref-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary-teal);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--background-gray);
    border-top: 1px solid var(--border-color);
    padding: 40px 32px 30px;
    text-align: center;
    color: var(--text-secondary);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-text {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.footer-copyright {
    font-size: 12px;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .header-inner {
        padding: 16px 20px;
    }

    .nav-links {
        gap: 16px;
        font-size: 14px;
    }

    .logo-text {
        font-size: 16px;
    }

    .hamburger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--background-white);
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 100;
        padding-top: 80px;
    }

    .nav.active {
        right: 0;
    }

    .nav-links {
        flex-direction: column;
        gap: 0;
        padding: 20px;
    }

    .nav-links li {
        padding: 0;
    }

    .nav-links a {
        display: block;
        padding: 15px 20px;
        font-size: 16px;
        border-bottom: 1px solid var(--border-color);
        color: var(--text-primary);
    }

    .nav-links a:hover {
        background: var(--background-gray);
        color: var(--primary-teal);
    }

    /* オーバーレイ */
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .hero {
        padding: 60px 20px 80px;
    }

    .main-content {
        padding: 60px 20px;
    }

    .footer {
        padding: 30px 20px 20px;
    }

    .evidence-grid {
        grid-template-columns: 1fr;
    }

    .author-content {
        flex-direction: column;
        text-align: center;
    }
    
    .author-image {
        align-self: center;
    }
}

/* Animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}