/* ========================================
   About Page Specific Styles
   ======================================== */

/* Header adjustments */
.logo h1 {
    font-size: var(--font-size-xl);
    margin: 0;
}

/* Hero Secondary */
.hero-secondary {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-secondary .hero-title {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.hero-secondary .hero-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-lg);
}

/* Navigation Active State */
.nav a.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* ========================================
   Mission, Vision, Value Section
   ======================================== */
.mvv-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

.mvv-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.purpose-card .mvv-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: var(--color-white);
}

.vision-card .mvv-icon {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: var(--color-white);
}

.mission-card .mvv-icon {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: var(--color-white);
}

.mvv-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.mvv-subtitle {
    font-size: var(--font-size-base);
    font-weight: 400;
    color: var(--color-gray-600);
    margin-left: var(--spacing-sm);
}

.mvv-description {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-top: var(--spacing-lg);
}

.mvv-list {
    list-style: none;
    text-align: left;
    margin-top: var(--spacing-lg);
}

.mvv-list li {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.mvv-list li i {
    font-size: 1.5rem;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.mvv-list li strong {
    display: block;
    font-size: var(--font-size-lg);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.mvv-list li p {
    color: var(--color-gray-700);
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   Challenges Section
   ======================================== */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    width: 100%;
}

.challenge-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    width: 100%;
    box-sizing: border-box;
}

.challenge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.challenge-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-white);
}

.body-icon {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.mind-icon {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.society-icon {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.challenge-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.challenge-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
}

.challenge-list {
    list-style: none;
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.challenge-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-gray-700);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.challenge-list li i {
    color: var(--color-warning);
    flex-shrink: 0;
}

.challenge-impact {
    padding: var(--spacing-md);
    background-color: var(--color-gray-100);
    border-left: 4px solid var(--color-danger);
    border-radius: var(--radius-md);
    color: var(--color-gray-700);
    font-weight: 500;
    line-height: 1.6;
}

/* Solution Message */
.solution-message {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--color-white);
}

.solution-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.solution-message h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.solution-message p {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    line-height: 1.7;
}

/* ========================================
   Data Usage Section
   ======================================== */
.usage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    width: 100%;
}

.usage-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    width: 100%;
    box-sizing: border-box;
}

.usage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.usage-number {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-gray-200);
    line-height: 1;
}

.usage-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-white);
}

.usage-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.usage-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.usage-description strong {
    color: var(--color-primary);
}

.usage-example {
    padding: var(--spacing-md);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-md);
    color: var(--color-gray-700);
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.usage-example i {
    color: var(--color-success);
    margin-right: var(--spacing-xs);
}

/* ========================================
   CTA Section
   ======================================== */
.section-cta {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: var(--color-white);
}

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

.cta-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.cta-content p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    transform: translateY(-2px);
}

/* ========================================
   Responsive Design - Tablet
   ======================================== */
@media (max-width: 768px) {
    .challenges-grid {
        grid-template-columns: 1fr;
    }
    
    .usage-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    /* Tablet size adjustments */
    .section-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
        line-height: 1.3;
    }
}

/* ========================================
   Responsive Design - Mobile
   ======================================== */
@media (max-width: 480px) {
    /* Hero */
    .hero-secondary {
        padding: 2rem 0;
    }
    
    .hero-secondary .hero-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
        word-break: keep-all;
    }
    
    .hero-secondary .hero-subtitle {
        font-size: var(--font-size-base);
        line-height: 1.6;
    }
    
    /* Section Title - index.htmlと同じサイズに */
    .section-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
        word-break: keep-all;
    }
    
    /* MVV Cards */
    .mvv-card {
        padding: var(--spacing-lg);
    }
    
    .mvv-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
    }
    
    .mvv-title {
        font-size: var(--font-size-lg);
        line-height: 1.3;
        word-break: keep-all;
    }
    
    .mvv-subtitle {
        font-size: var(--font-size-sm);
        display: block;
        margin-left: 0;
        margin-top: var(--spacing-xs);
    }
    
    .mvv-description {
        font-size: var(--font-size-sm);
        line-height: 1.7;
    }
    
    .mvv-list {
        margin-top: var(--spacing-md);
    }
    
    .mvv-list li {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }
    
    .mvv-list li i {
        font-size: 1.25rem;
    }
    
    .mvv-list li strong {
        font-size: var(--font-size-base);
    }
    
    .mvv-list li p {
        font-size: var(--font-size-sm);
    }
    
    /* Challenge Cards */
    .challenge-card {
        padding: var(--spacing-lg);
    }
    
    .challenge-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
    }
    
    .challenge-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-xs);
        line-height: 1.3;
    }
    
    .challenge-subtitle {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-md);
    }
    
    .challenge-list {
        margin-bottom: var(--spacing-md);
    }
    
    .challenge-list li {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) 0;
    }
    
    .challenge-impact {
        font-size: var(--font-size-sm);
        padding: var(--spacing-sm);
        line-height: 1.6;
    }
    
    /* Solution Message */
    .solution-message {
        padding: var(--spacing-lg);
    }
    
    .solution-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .solution-message h3 {
        font-size: var(--font-size-lg);
        line-height: 1.4;
        margin-bottom: var(--spacing-sm);
        word-break: keep-all;
    }
    
    .solution-message p {
        font-size: var(--font-size-sm);
        line-height: 1.6;
    }
    
    /* Usage Cards */
    .usage-card {
        padding: var(--spacing-lg);
    }
    
    .usage-number {
        font-size: 2rem;
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .usage-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
        margin-bottom: var(--spacing-md);
    }
    
    .usage-title {
        font-size: var(--font-size-base);
        line-height: 1.3;
        margin-bottom: var(--spacing-sm);
        word-break: keep-all;
    }
    
    .usage-description {
        font-size: var(--font-size-sm);
        line-height: 1.6;
        margin-bottom: var(--spacing-md);
    }
    
    .usage-example {
        font-size: 0.75rem;
        padding: var(--spacing-sm);
        line-height: 1.7;
    }
    
    /* CTA Section */
    .section-cta {
        padding: 2rem 0;
    }
    
    .cta-content h2 {
        font-size: var(--font-size-xl);
        line-height: 1.3;
        margin-bottom: var(--spacing-sm);
        word-break: keep-all;
    }
    
    .cta-content p {
        font-size: var(--font-size-sm);
        line-height: 1.6;
        margin-bottom: var(--spacing-xl);
    }
    
    .cta-buttons {
        gap: var(--spacing-md);
    }
    
    .cta-buttons .btn-large {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
}