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

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #fafafa;
}

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

.hero {
    text-align: center;
    padding: 80px 20px 60px;
    background: white;
    margin-bottom: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.25rem;
    color: #666;
    font-weight: 400;
}

.problem-statement {
    margin-bottom: 60px;
}

.card {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.card h2 {
    font-size: 1.75rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.card p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #333;
}

.framework {
    margin-bottom: 60px;
}

.framework > h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 600;
}

.axis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.axis-card {
    background: white;
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.axis-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.axis-number {
    font-size: 3rem;
    font-weight: 700;
    color: #e0e0e0;
    margin-bottom: 10px;
    line-height: 1;
}

.axis-card h3 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    font-weight: 600;
}

.methods {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.method {
    padding: 16px;
    background: #f8f8f8;
    border-radius: 6px;
    border-left: 3px solid #333;
}

.method h4 {
    font-size: 1rem;
    margin-bottom: 6px;
    font-weight: 600;
}

.method p {
    font-size: 0.9rem;
    color: #666;
}

.checklist {
    margin-bottom: 60px;
}

.checklist > h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 600;
}

.check-card {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    max-width: 800px;
    margin: 0 auto;
}

.instruction {
    font-size: 1.1rem;
    margin-bottom: 30px;
    font-weight: 500;
}

.checks {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: #f8f8f8;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.check-item:hover {
    background: #f0f0f0;
}

.check-item input[type="checkbox"] {
    margin-top: 4px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.check-item span {
    flex: 1;
    font-size: 1rem;
}

.result {
    margin-top: 30px;
    padding: 20px;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.result.show {
    opacity: 1;
}

.action-plan {
    margin-bottom: 60px;
}

.action-plan > h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 600;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.step {
    background: white;
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: #1a1a1a;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.step p {
    color: #666;
    line-height: 1.6;
}

footer {
    text-align: center;
    padding: 60px 20px;
    color: #666;
    font-size: 1.1rem;
    font-style: italic;
}

.pre-customer {
    margin-bottom: 60px;
}

.pre-customer > h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 600;
}

.pre-customer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto 30px;
}

.pre-customer-card {
    background: white;
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.pre-customer-card h3 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    font-weight: 600;
}

.warning-box {
    background: #fff3e0;
    border-left: 4px solid #f57c00;
    padding: 24px;
    border-radius: 6px;
    max-width: 900px;
    margin: 0 auto;
}

.warning-box p {
    font-size: 1rem;
    line-height: 1.8;
    color: #e65100;
}

.warning-box strong {
    font-weight: 700;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .card {
        padding: 30px 20px;
    }
    
    .axis-grid {
        grid-template-columns: 1fr;
    }
    
    .tree-container,
    .steps {
        grid-template-columns: 1fr;
    }
}