:root {
    --color-primary: #0A4F3C;
    --color-secondary: #F59E0B;
    --color-success: #059669;
    --color-background: #FAF8F3;
    --color-surface: #FFFFFF;
    --color-text: #1C1917;
    --color-text-secondary: #78716C;
    --color-border: #E7E5E4;
    --color-hover: #083A2E;
    
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Navigation */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 248, 243, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 20px;
    color: var(--color-primary);
}

.brand-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text);
    cursor: pointer;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-menu.active {
    max-height: 300px;
}

.mobile-menu ul {
    list-style: none;
    padding: var(--spacing-sm);
}

.mobile-menu a {
    display: block;
    padding: var(--spacing-sm);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mobile-menu a:hover {
    background: var(--color-background);
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    margin-top: 65px;
    padding: var(--spacing-3xl) 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.hero-content {
    max-width: 600px;
}

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

.hero-time {
    display: block;
    font-size: 96px;
    font-weight: 900;
    line-height: 1;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    display: block;
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

.hero-description {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 48px;
}

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

.btn-primary:hover {
    background: var(--color-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 900;
    color: var(--color-primary);
    font-family: 'Roboto Mono', monospace;
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 2px;
    height: 40px;
    background: var(--color-border);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.clock-diagram {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.clock-label-main {
    font-size: 24px;
    font-weight: 700;
    fill: var(--color-primary);
}

.clock-label-sub {
    font-size: 16px;
    fill: var(--color-text-secondary);
}

.clock-label-eating {
    font-size: 16px;
    font-weight: 600;
    fill: var(--color-secondary);
}

/* Method Section */
.method-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-header p {
    font-size: 18px;
    color: var(--color-text-secondary);
}

.method-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.method-card {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

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

.method-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
}

.method-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.method-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Timeline */
.timeline-container {
    background: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.timeline-container h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.timeline-time {
    position: absolute;
    left: -80px;
    font-family: 'Roboto Mono', monospace;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.timeline-dot {
    position: absolute;
    left: -28px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 3px solid var(--color-border);
}

.timeline-dot.active {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
}

.timeline-content {
    flex: 1;
    padding-left: var(--spacing-lg);
}

.timeline-content strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.timeline-content p {
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* Calculator Section */
.calculator-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-surface) 100%);
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.calculator-inputs {
    padding: var(--spacing-md);
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text);
}

.input-group input,
.input-group select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--color-surface);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.calculator-result {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.calculator-result h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.result-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.result-item.fasting {
    background: rgba(10, 79, 60, 0.1);
    border: 2px solid var(--color-primary);
}

.result-item.eating {
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid var(--color-secondary);
}

.result-item i {
    font-size: 24px;
}

.result-item.fasting i {
    color: var(--color-primary);
}

.result-item.eating i {
    color: var(--color-secondary);
}

.result-item strong {
    display: block;
    margin-bottom: 4px;
}

.result-item span {
    font-family: 'Roboto Mono', monospace;
    font-size: 18px;
    font-weight: 500;
}

.result-tips h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.result-tips ul {
    list-style: none;
    padding-left: 0;
}

.result-tips li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
}

.result-tips li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* Guide Section */
.guide-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.guide-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--color-primary);
}

.tab-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.tab-content {
    background: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    min-height: 400px;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.tab-panel h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.week-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.week-card {
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 2px solid var(--color-border);
    transition: var(--transition);
}

.week-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.week-number {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.week-card h4 {
    font-size: 18px;
    margin-bottom: var(--spacing-xs);
}

.week-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.food-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.food-category {
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.food-category h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.food-category ul {
    list-style: none;
}

.food-category li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
}

.drinks-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.drink-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
}

.drink-card.allowed {
    border-color: var(--color-success);
}

.drink-card.not-allowed {
    border-color: #DC2626;
}

.drink-card i {
    font-size: 32px;
    margin-bottom: var(--spacing-sm);
}

.drink-card.allowed i {
    color: var(--color-success);
}

.drink-card.not-allowed i {
    color: #DC2626;
}

.drink-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.drink-card ul {
    list-style: none;
}

.drink-card li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
}

.tips-list {
    display: grid;
    gap: var(--spacing-md);
}

.tip-item {
    display: flex;
    gap: var(--spacing-md);
    background: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.tip-number {
    font-size: 24px;
    font-weight: 900;
    color: var(--color-primary);
    font-family: 'Roboto Mono', monospace;
}

.tip-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.tip-item p {
    color: var(--color-text-secondary);
}

/* Science Section */
.science-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-background);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.benefit-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid transparent;
    transition: var(--transition);
}

.benefit-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-primary);
}

.benefit-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.benefit-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.benefit-stat {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(10, 79, 60, 0.1);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.research-section {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.research-section h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.research-list {
    display: grid;
    gap: var(--spacing-md);
}

.research-item {
    padding: var(--spacing-md);
    background: var(--color-background);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.research-item cite {
    font-weight: 600;
    color: var(--color-text);
    font-style: normal;
}

.research-item p {
    margin-top: var(--spacing-xs);
    color: var(--color-text-secondary);
}

/* FAQ Section */
.faq-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--color-background);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(10, 79, 60, 0.05);
}

.faq-question i {
    transition: transform 0.3s ease;
}

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

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

.faq-answer.active {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-hover) 100%);
}

.cta-content {
    text-align: center;
    color: white;
}

.cta-content h2 {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 18px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

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

.cta-content .btn:hover {
    background: var(--color-background);
}

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

.footer-content {
    text-align: center;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-disclaimer {
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    opacity: 0.8;
    line-height: 1.6;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        margin-top: var(--spacing-xl);
    }
    
    .method-grid,
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .week-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero-time {
        font-size: 64px;
    }
    
    .hero-subtitle {
        font-size: 24px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stat-divider {
        width: 40px;
        height: 2px;
    }
    
    .method-grid,
    .benefits-grid,
    .faq-grid,
    .food-categories {
        grid-template-columns: 1fr;
    }
    
    .calculator-container {
        grid-template-columns: 1fr;
    }
    
    .week-grid {
        grid-template-columns: 1fr;
    }
    
    .drinks-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-time {
        position: static;
        margin-bottom: var(--spacing-xs);
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .cta-content h2 {
        font-size: 28px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}