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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background: #f9fafb;
}

/* Header */
header {
    background: white;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #2563eb;
}

nav {
    display: flex;
    gap: 24px;
}

nav a {
    color: #374151;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

nav a:hover {
    color: #2563eb;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 24px;
}

.mobile-menu {
    display: none;
    background: white;
    border-top: 1px solid #e5e7eb;
    padding: 16px;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 12px 0;
    color: #374151;
    text-decoration: none;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 100px 0;
    color: white;
}

.hero-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 80px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 24px;
    font-size: 14px;
    margin-bottom: 24px;
}

h1 {
    font-size: 56px;
    font-weight: bold;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-pillars {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 800px;
    margin: 48px auto 40px;
}

.pillar-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
}

.pillar-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.pillar-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 8px;
}

.pillar-desc {
    font-size: 16px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: white;
    color: #667eea;
    padding: 16px 32px;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    padding: 16px 32px;
    border: 2px solid white;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-text {
    color: #2563eb;
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: none;
    font-weight: 500;
}

.btn-text:hover {
    text-decoration: underline;
}

/* Section */
section {
    padding: 80px 0;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 80px;
}

h2 {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 16px;
    color: #111827;
}

.section-subtitle {
    color: #6b7280;
    font-size: 18px;
    margin-bottom: 48px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

/* Case Studies */
.case-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.case-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: all 0.2s;
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.savings-badge {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
}

.case-title {
    font-weight: bold;
    font-size: 18px;
    margin-bottom: 20px;
    color: #111827;
}

.case-comparison {
    font-size: 14px;
    margin-bottom: 20px;
}

.case-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid #f3f4f6;
}

.case-row:last-child {
    border-bottom: none;
}

.text-red {
    color: #dc2626;
    font-weight: 500;
}

.text-green {
    color: #16a34a;
    font-weight: 500;
}

.case-note {
    background: #f9fafb;
    border-left: 3px solid #2563eb;
    padding: 16px 20px;
    font-size: 13px;
    color: #4b5563;
    margin-top: 16px;
    line-height: 1.8;
}

.case-note-title {
    font-weight: bold;
    color: #374151;
    margin-bottom: 8px;
}

.case-note-warning {
    background: #fef3c7;
    border-left: 3px solid #f59e0b;
    padding: 12px 16px;
    font-size: 13px;
    color: #92400e;
    margin-top: 12px;
    line-height: 1.6;
    border-radius: 0 8px 8px 0;
}

/* Before/After Bar Chart */
.case-bar-chart {
    margin: 20px 0;
}

.case-bar {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.case-bar-label {
    width: 50px;
    font-size: 13px;
    color: #6b7280;
    font-weight: 500;
}

.case-bar-track {
    flex: 1;
    height: 36px;
    background: #f3f4f6;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.case-bar-fill {
    height: 100%;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 12px;
    font-weight: bold;
    color: white;
    font-size: 14px;
    transition: width 0.5s ease;
}

.case-bar-fill.before {
    background: linear-gradient(90deg, #ef4444, #dc2626);
}

.case-bar-fill.after {
    background: linear-gradient(90deg, #10b981, #059669);
}

.case-bar-desc {
    font-size: 13px;
    color: #4b5563;
    margin-top: 4px;
    margin-bottom: 12px;
    padding-left: 50px;
}

/* Symptom Navigation */
.symptom-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.symptom-button {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    color: #111827;
}

.symptom-button:hover {
    border-color: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.1);
}

.symptom-button-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.symptom-button-title {
    font-weight: bold;
    font-size: 18px;
    margin-bottom: 8px;
}

.symptom-button-desc {
    font-size: 14px;
    color: #6b7280;
}

/* Video Section */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: box-shadow 0.2s;
    cursor: pointer;
}

.video-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.play-button:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.video-content {
    padding: 20px;
}

.video-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.badge {
    display: inline-block;
    background: #dbeafe;
    color: #2563eb;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.badge-category {
    background: #f3f4f6;
    color: #6b7280;
}

.badge-level {
    background: #fef3c7;
    color: #d97706;
}

.video-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 12px;
    color: #111827;
}

.video-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: #6b7280;
    margin-bottom: 12px;
}

/* Prevention Levels */
.prevention-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.prevention-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: all 0.2s;
}

.prevention-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.prevention-level {
    display: inline-block;
    background: #eff6ff;
    color: #2563eb;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.prevention-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 12px;
    color: #111827;
}

.prevention-desc {
    color: #6b7280;
    margin-bottom: 16px;
    line-height: 1.8;
}

.prevention-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.topic-tag {
    background: #f3f4f6;
    color: #4b5563;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: box-shadow 0.2s;
    cursor: pointer;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card-image {
    aspect-ratio: 16/9;
    background: linear-gradient(to bottom right, #dbeafe, #e0e7ff);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.card-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: #ef4444;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.card-content {
    padding: 16px;
}

.card-labels {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.card-title {
    font-weight: 500;
    margin-bottom: 12px;
}

/* News */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.news-item {
    background: #f9fafb;
    border-radius: 12px;
    padding: 24px;
    transition: background 0.2s;
    cursor: pointer;
}

.news-item:hover {
    background: #f3f4f6;
}

.news-header {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
    align-items: center;
}

.news-title {
    font-weight: bold;
    margin-bottom: 8px;
}

.news-summary {
    font-size: 14px;
    color: #6b7280;
}

/* Disclaimer */
.disclaimer {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 20px;
    border-radius: 8px;
    margin-top: 32px;
}

.disclaimer-title {
    font-weight: bold;
    color: #92400e;
    margin-bottom: 8px;
}

.disclaimer-text {
    font-size: 14px;
    color: #78350f;
    line-height: 1.6;
}

/* Footer */
footer {
    background: #111827;
    color: #9ca3af;
    padding: 64px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 32px;
}

.footer-column h4 {
    color: white;
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 8px;
}

.footer-column a {
    color: #9ca3af;
    text-decoration: none;
    font-size: 14px;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 32px;
    text-align: center;
    font-size: 14px;
}

/* Mobile Bottom Bar */
.mobile-bottom-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e5e7eb;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 40;
}

.mobile-bottom-bar-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    height: 64px;
}

.mobile-bottom-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #6b7280;
    text-decoration: none;
    font-size: 12px;
    transition: color 0.2s;
}

.mobile-bottom-btn:hover {
    color: #2563eb;
}

/* Responsive */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 24px;
    }

    .container {
        padding: 0 24px;
    }

    nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-container {
        padding: 0 24px;
    }

    .hero-pillars {
        grid-template-columns: 1fr;
    }

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

    .case-bar-label {
        width: 45px;
        font-size: 12px;
    }

    .case-bar-fill {
        font-size: 12px;
        padding-right: 8px;
    }

    .case-bar-desc {
        font-size: 12px;
        padding-left: 45px;
    }

    .symptom-nav {
        grid-template-columns: repeat(2, 1fr);
    }

    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }

    h2 {
        font-size: 28px;
    }

    section {
        padding: 48px 0;
    }

    .hero {
        padding: 60px 0;
    }

    .symptom-nav {
        grid-template-columns: 1fr;
    }

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

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

    .mobile-bottom-bar {
        display: block;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons a,
    .hero-buttons button {
        width: 100%;
        justify-content: center;
    }

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

/* Prevention Level Tabs */
.prevention-tabs-container {
    max-width: 900px;
    margin: 0 auto;
}

.prevention-tabs-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 32px;
}

.prevention-tab {
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    background: white;
    border: 2px solid #e5e7eb;
    font-size: 14px;
    font-weight: 600;
    color: #4b5563;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.prevention-tab:hover {
    border-color: #2563eb;
    color: #2563eb;
}

.prevention-tab.active {
    background: #2563eb;
    border-color: #2563eb;
    color: white;
}

.prevention-tab[data-level="0"].active {
    background: #2563eb;
    border-color: #2563eb;
}

.prevention-tab[data-level="1"].active {
    background: #16a34a;
    border-color: #16a34a;
}

.prevention-tab[data-level="2"].active {
    background: #f59e0b;
    border-color: #f59e0b;
}

.prevention-tab[data-level="3"].active {
    background: #dc2626;
    border-color: #dc2626;
}

.prevention-tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.prevention-tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.tab-section-badge {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    color: white;
}

.tab-section-badge.level-0 { background: #2563eb; }
.tab-section-badge.level-1 { background: #16a34a; }
.tab-section-badge.level-2 { background: #f59e0b; }
.tab-section-badge.level-3 { background: #dc2626; }

.tab-section-title {
    font-size: 24px;
    font-weight: bold;
    color: #111827;
}

.tab-content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tab-content-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.tab-content-card-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.tab-content-card-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 12px;
    color: #111827;
}

.tab-content-card-desc {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.8;
}

.tab-learn-more {
    margin-top: 32px;
    text-align: center;
}

.tab-learn-more-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
    padding: 12px 24px;
    background: #eff6ff;
    border-radius: 8px;
    transition: all 0.2s;
}

.tab-learn-more-link:hover {
    background: #dbeafe;
}

@media (max-width: 1024px) {
    .prevention-tabs-nav {
        gap: 6px;
    }
    
    .prevention-tab {
        padding: 10px 16px;
        font-size: 13px;
    }
    
    .tab-content-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .prevention-tabs-nav {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }
    
    .prevention-tab {
        flex-shrink: 0;
        padding: 10px 14px;
        font-size: 12px;
    }
    
    .tab-content-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .tab-section-title {
        font-size: 20px;
    }
}

/* FAQ Styles */
.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 24px;
    background: white;
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

.faq-question:hover {
    background: #f9fafb;
}

.faq-icon {
    font-size: 12px;
    color: #6b7280;
    transition: transform 0.3s;
}

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

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

.faq-answer p,
.faq-answer ul {
    padding: 0 24px;
    color: #4b5563;
    line-height: 1.8;
}

.faq-answer p:first-child {
    padding-top: 0;
}

.faq-answer p:last-child {
    padding-bottom: 24px;
}

@media (max-width: 768px) {
    .faq-question {
        padding: 16px;
        font-size: 14px;
    }
    
    .faq-answer p,
    .faq-answer ul {
        padding: 0 16px;
        font-size: 14px;
    }
    
    .faq-answer p:last-child {
        padding-bottom: 16px;
    }
}