:root {
    --primary-color: #1a4d7a;
    --secondary-color: #2d6a9f;
    --accent-color: #4a90d9;
    --dark-bg: #0f2439;
    --light-bg: #f4f7fa;
    --text-dark: #1e2938;
    --text-light: #5a6c7d;
    --border-color: #d1dce5;
    --success-color: #2e7d32;
    --warning-color: #f57c00;
    --danger-color: #c62828;
    --white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--light-bg);
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color);
}

.site-header {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.container-header {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo-img {
    width: 70px;
    height: 70px;
    border-radius: 8px;
    border: 3px solid var(--white);
    object-fit: cover;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.site-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.5px;
}

.site-tagline {
    font-size: 0.95rem;
    opacity: 0.9;
    margin-top: 0.25rem;
    font-weight: 300;
}

.header-meta {
    display: flex;
    gap: 2rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.95;
}

.meta-item i {
    font-size: 1.1rem;
}

.main-nav {
    background-color: rgba(0,0,0,0.2);
}

.container-nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.nav-menu li {
    flex: 1;
}

.nav-menu a {
    display: block;
    padding: 1rem;
    color: var(--white);
    text-align: center;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: rgba(255,255,255,0.1);
    border-bottom-color: var(--accent-color);
}

.nav-menu a i {
    margin-right: 0.4rem;
    font-size: 0.9rem;
}

.main-content {
    min-height: calc(100vh - 400px);
}

.portal-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

section {
    margin-bottom: 4rem;
    background: var(--white);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
}

.section-header {
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 1rem;
}

.section-header h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-header h2 i {
    font-size: 1.8rem;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1.05rem;
    font-weight: 400;
}

.featured-study {
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 100%);
    border: 2px solid var(--accent-color);
    position: relative;
    overflow: hidden;
}

.study-badge {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.study-badge i {
    margin-right: 0.5rem;
}

.study-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: start;
}

.study-title {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.study-meta {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.95rem;
    color: var(--text-light);
}

.study-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.study-abstract {
    margin: 1.5rem 0;
}

.study-abstract h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.study-abstract p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.study-visual {
    position: relative;
}

.study-image {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.visual-caption {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
    font-style: italic;
    text-align: center;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary i {
    margin-right: 0.5rem;
}

.indicators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.indicator-card {
    background: linear-gradient(135deg, var(--white) 0%, var(--light-bg) 100%);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 1.5rem;
    align-items: center;
    transition: all 0.3s ease;
}

.indicator-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.indicator-icon {
    width: 70px;
    height: 70px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.indicator-icon i {
    font-size: 2rem;
    color: var(--white);
}

.indicator-data h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.indicator-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0.5rem 0;
}

.indicator-desc {
    font-size: 0.9rem;
    color: var(--text-light);
}

.behavior-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
}

.insight-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.insight-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    opacity: 0.3;
    flex-shrink: 0;
}

.insight-text h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.insight-text p {
    line-height: 1.7;
    color: var(--text-dark);
}

.behavior-image {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.chart-description {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
}

.chart-description h4 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.participation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.participation-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.participation-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.card-header i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.card-header h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
}

.participation-card p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.link-study {
    color: var(--accent-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.link-study:hover {
    gap: 1rem;
}

.risk-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
}

.risk-categories {
    display: grid;
    gap: 1.5rem;
}

.risk-category {
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--light-bg);
}

.risk-level {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.risk-level i {
    font-size: 1.2rem;
}

.risk-medium {
    background: #fff3e0;
    color: var(--warning-color);
}

.risk-high {
    background: #ffebee;
    color: var(--danger-color);
}

.risk-category p {
    margin-top: 1rem;
    line-height: 1.7;
}

.risk-category strong {
    color: var(--primary-color);
}

.disclaimer-box {
    background: #e8f5e9;
    border: 2px solid var(--success-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.disclaimer-box h3 {
    color: var(--success-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.disclaimer-box p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.risk-image {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.mistakes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.mistake-card {
    background: linear-gradient(135deg, #fff3e0 0%, #ffffff 100%);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--warning-color);
    transition: all 0.3s ease;
}

.mistake-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.mistake-icon {
    width: 50px;
    height: 50px;
    background: var(--warning-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.mistake-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.mistake-card p {
    line-height: 1.7;
    color: var(--text-dark);
}

.facts-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.fact-item {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 100%);
    border-radius: 8px;
    border: 1px solid var(--accent-color);
    transition: all 0.3s ease;
}

.fact-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.fact-number {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.fact-number i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.fact-number span {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.3;
}

.fact-content h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.fact-content p {
    line-height: 1.8;
    color: var(--text-dark);
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.publication-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--white);
}

.publication-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.pub-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.pub-content {
    padding: 1.5rem;
}

.pub-date {
    display: inline-block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.pub-date i {
    margin-right: 0.4rem;
}

.pub-content h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.pub-content p {
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--white);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.commentary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.comment-box {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    position: relative;
}

.comment-text {
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.comment-author {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.comment-author strong {
    color: var(--primary-color);
    font-size: 1.05rem;
}

.comment-author span {
    color: var(--text-light);
    font-size: 0.9rem;
}

.site-footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: 3rem 0 0;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section p {
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.footer-reg {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: var(--white);
    opacity: 0.85;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-section ul li a:hover {
    opacity: 1;
    transform: translateX(5px);
    color: var(--accent-color);
}

.footer-section i {
    margin-right: 0.5rem;
    color: var(--accent-color);
}

.footer-bottom {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.disclaimer-footer {
    background: rgba(0,0,0,0.3);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent-color);
}

.disclaimer-footer h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.disclaimer-footer p {
    line-height: 1.8;
    opacity: 0.9;
    font-size: 0.95rem;
}

.copyright {
    text-align: center;
    opacity: 0.8;
    font-size: 0.95rem;
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
    padding: 1.5rem;
    z-index: 10000;
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.cookie-text h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.cookie-text p {
    color: var(--text-dark);
    font-size: 0.95rem;
    line-height: 1.6;
}

.cookie-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.btn-cookie-accept,
.btn-cookie-decline {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.btn-cookie-accept {
    background: var(--success-color);
    color: var(--white);
}

.btn-cookie-accept:hover {
    background: #1b5e20;
    transform: translateY(-2px);
}

.btn-cookie-decline {
    background: var(--light-bg);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-cookie-decline:hover {
    background: var(--border-color);
}

.cookie-link {
    color: var(--accent-color);
    font-size: 0.9rem;
    text-decoration: underline;
}

@media (max-width: 1200px) {
    .study-content {
        grid-template-columns: 1fr;
    }
    
    .behavior-content {
        grid-template-columns: 1fr;
    }
    
    .risk-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container-header {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .header-brand {
        flex-direction: column;
    }
    
    .nav-menu {
        flex-direction: column;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .portal-container {
        padding: 2rem 1rem;
    }
    
    section {
        padding: 1.5rem;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .study-title {
        font-size: 1.6rem;
    }
    
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
    }
}