/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-medium: #4b5563;
    --text-light: #6b7280;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-gray: #f3f4f6;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Merriweather', Georgia, serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

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

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
}

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

.journal-tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    opacity: 0.95;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.authors-list {
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0.9;
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
}

.affiliations {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 0.75rem;
    opacity: 0.85;
    margin-bottom: var(--spacing-xl);
}

.affiliation {
    background: rgba(255, 255, 255, 0.15);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Sections */
.section {
    padding: var(--spacing-2xl) 0;
}

.section.bg-light {
    background-color: var(--bg-light);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--text-dark);
}

/* Abstract Section */
.abstract-content {
    max-width: 900px;
    margin: 0 auto;
}

.highlight-box {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.highlight-box p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.key-points {
    margin-top: var(--spacing-xl);
}

.key-points h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.points-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.point-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.point-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.point-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

/* Two Column Layout */
.two-column-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.column h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.stat-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

.quote-box {
    border-left: 4px solid var(--accent-color);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--text-medium);
    font-size: 1.125rem;
}

.quote-box.large {
    font-size: 1.5rem;
    text-align: center;
    border-left: none;
    padding: var(--spacing-xl);
    background: var(--bg-gray);
    border-radius: 12px;
}

.approach-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.approach-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.approach-badge.first-aid {
    background: #fef3c7;
    color: #92400e;
}

.approach-badge.second-aid {
    background: #dbeafe;
    color: #1e40af;
}

.approach-card h4 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.approach-card ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.approach-card li {
    margin-bottom: var(--spacing-xs);
}

.approach-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-gray);
    border-radius: 6px;
    font-size: 0.95rem;
}

/* Process Steps */
.process-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.step {
    flex: 1;
    min-width: 200px;
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.step h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

/* Technology and Targets Grids */
.tech-grid,
.targets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.tech-card,
.target-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--primary-color);
}

.target-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.tech-card h4,
.target-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.example {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-gray);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-medium);
}

/* Case Study Tabs */
.case-study-tabs {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.tabs {
    display: flex;
    background: var(--bg-gray);
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    font-weight: 600;
    color: var(--text-medium);
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    background: rgba(37, 99, 235, 0.1);
}

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

.tab-content {
    display: none;
    padding: var(--spacing-xl);
}

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

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.case-header h3 {
    font-size: 2rem;
    color: var(--text-dark);
}

.iucn-badge,
.success-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.875rem;
}

.iucn-badge.vulnerable {
    background: #fef3c7;
    color: #92400e;
}

.success-badge {
    background: #d1fae5;
    color: #065f46;
}

.case-timeline {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.year {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 80px;
}

.case-challenge,
.case-solution,
.intervention-box,
.results-box {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: 8px;
}

.case-challenge {
    background: #fee2e2;
    border-left: 4px solid var(--danger-color);
}

.case-solution {
    background: #d1fae5;
    border-left: 4px solid var(--success-color);
}

.intervention-box {
    background: #dbeafe;
    border-left: 4px solid var(--primary-color);
}

.results-box.success {
    background: #d1fae5;
    border-left: 4px solid var(--success-color);
}

.erosion-case {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--warning-color);
}

.erosion-case h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.warning {
    color: var(--danger-color);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

.insight {
    color: var(--primary-color);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

.candidates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.candidate-card {
    background: white;
    border: 2px solid var(--border-color);
    padding: var(--spacing-lg);
    border-radius: 12px;
    transition: all 0.3s;
}

.candidate-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.candidate-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* Principles */
.principles-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    font-size: 1.125rem;
    color: var(--text-medium);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.principle-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    position: relative;
    padding-top: 3rem;
}

.principle-number {
    position: absolute;
    top: -15px;
    left: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.principle-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.consideration-box {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.consideration-box h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

/* Decision Framework */
.decision-framework {
    margin-top: var(--spacing-xl);
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: 12px;
}

.framework-flowchart {
    margin: var(--spacing-lg) 0;
}

.decision-node {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
}

.decision-path {
    margin-left: var(--spacing-lg);
    margin-top: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--primary-color);
}

.path-label {
    display: inline-block;
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.next-question {
    margin: var(--spacing-md) 0;
    font-weight: 600;
    color: var(--text-dark);
}

.outcome.success {
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: 8px;
    font-weight: 700;
    text-align: center;
    margin-top: var(--spacing-md);
}

.framework-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: white;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

/* Outlook Section */
.vision-statement {
    text-align: center;
    max-width: 900px;
    margin: 0 auto var(--spacing-xl);
}

.lead {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.challenge-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.challenge-item {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--warning-color);
}

.challenge-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.opportunity-timeline {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.timeline-phase {
    flex: 1;
    min-width: 250px;
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.timeline-phase h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.timeline-arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

.collaborators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.collaborator {
    background: white;
    padding: var(--spacing-sm);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

/* Authors Section */
.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.author-card,
.institutions-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.author-item {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.author-item:last-child {
    border-bottom: none;
}

.email {
    color: var(--primary-color);
    font-size: 0.9rem;
}

.institution-list {
    list-style: none;
}

.institution-list li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-color);
}

.citation-box {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 12px;
    margin-top: var(--spacing-xl);
    border-left: 4px solid var(--primary-color);
}

.citation-box h4 {
    margin-bottom: var(--spacing-sm);
}

.citation-box a {
    color: var(--primary-color);
    text-decoration: none;
}

.citation-box a:hover {
    text-decoration: underline;
}

.funding-note {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-gray);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-medium);
}

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

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

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

.footer-links a {
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.footer-links a:hover {
    opacity: 0.8;
}

.footer-info {
    opacity: 0.7;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.125rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
        font-size: 0.875rem;
    }
    
    .two-column-layout,
    .two-column {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        flex-direction: column;
    }
    
    .arrow {
        transform: rotate(90deg);
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        border-bottom: 1px solid var(--border-color);
        border-left: 3px solid transparent;
    }
    
    .tab-btn.active {
        border-left-color: var(--primary-color);
        border-bottom-color: var(--border-color);
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-actions,
    .footer {
        display: none;
    }
    
    .hero {
        background: white;
        color: var(--text-dark);
    }
    
    .section {
        page-break-inside: avoid;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #f9fafb;
        --text-medium: #d1d5db;
        --text-light: #9ca3af;
        --bg-white: #111827;
        --bg-light: #1f2937;
        --bg-gray: #374151;
        --border-color: #4b5563;
    }
    
    .hero {
        background: linear-gradient(135deg, #4c1d95 0%, #5b21b6 100%);
    }
}