/* ============================================
   CADIA — Modern Research Center Stylesheet
   ============================================ */

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Design Tokens */
:root {
    --cadia-dark: #00695C;
    --cadia-green: #00897B;
    --cadia-light: #E0F2EF;
    --cadia-mint: #B2DFDB;
    --cadia-accent: #4DB6AC;
    --dark: #1a1a2e;
    --dark-secondary: #2d2d44;
    --text-primary: #1a1a2e;
    --text-secondary: #555;
    --text-light: #888;
    --white: #ffffff;
    --off-white: #f8fafa;
    --border: #e0e0e0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
    --font-body: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    font-size: 17px;
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--cadia-green);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--cadia-dark);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.97);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logos {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo img {
    height: 36px;
    width: auto;
    opacity: 0;
    transition: opacity var(--transition);
}

.ru-logo img {
    height: 40px;
}

.navbar.scrolled .nav-logo img {
    opacity: 1;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    padding: 0.25rem 0;
    position: relative;
    transition: color var(--transition);
}

.navbar.scrolled .nav-links a {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--cadia-accent);
    transition: width var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: all var(--transition);
}

.navbar.scrolled .nav-toggle span {
    background: var(--text-primary);
}

/* ============================================
   Hero
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark) 0%, #16213e 50%, var(--cadia-dark) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(77, 182, 172, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 137, 123, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    text-align: center;
    padding: 2rem;
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-logo {
    width: 280px;
    margin: 0 auto 2.5rem;
    filter: brightness(0) invert(1);
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--white);
    line-height: 1.3;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.hero-tagline {
    font-size: 1.15rem;
    color: var(--cadia-mint);
    font-weight: 400;
    margin-bottom: 2.5rem;
}

.hero-cta {
    display: inline-block;
    padding: 0.8rem 2rem;
    border: 1.5px solid var(--cadia-accent);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: 50px;
    transition: all var(--transition);
}

.hero-cta:hover {
    background: var(--cadia-accent);
    color: var(--white);
}

/* ============================================
   Section Base
   ============================================ */
.section {
    padding: 4rem 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.section-line {
    width: 50px;
    height: 3px;
    background: var(--cadia-green);
    margin: 0 auto 1rem;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ============================================
   About
   ============================================ */
.about {
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat {
    background: var(--cadia-light);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    transition: transform var(--transition);
}

.stat:hover {
    transform: translateY(-2px);
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--cadia-dark);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    font-weight: 500;
}

/* ============================================
   Labs
   ============================================ */
.labs {
    background: var(--off-white);
}

.labs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

a.lab-card {
    text-decoration: none;
    color: inherit;
}

.lab-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.lab-image {
    overflow: hidden;
    background-color: #1a1a2e;
}

.lab-image img {
    width: 100%;
    display: block;
    transition: transform 0.5s ease;
}

.lab-card:hover .lab-image img {
    transform: scale(1.05);
}

.lab-info {
    padding: 1.25rem 1.5rem 1.5rem;
}

.lab-info h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.lab-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Project Showcase (Marquee)
   ============================================ */
.showcase {
    background: var(--dark);
    padding: 3rem 0;
    overflow: hidden;
}

.showcase .section-header {
    margin-bottom: 2rem;
    padding: 0 2rem;
}

.showcase .section-header h2 {
    color: var(--white);
}

.showcase .section-line {
    background: var(--cadia-accent);
}

.showcase .section-subtitle {
    color: rgba(255, 255, 255, 0.6);
}

.marquee-wrapper {
    position: relative;
    padding: 0 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.marquee-track {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 0.5rem;
}

.marquee-track::-webkit-scrollbar {
    display: none;
}

.showcase-controls {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding: 0 2rem;
}

.showcase-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: var(--white);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.showcase-btn:hover {
    background: var(--cadia-accent);
    border-color: var(--cadia-accent);
}

.marquee-item {
    flex-shrink: 0;
    width: 280px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--dark-secondary);
    transition: transform var(--transition);
    cursor: pointer;
}

.marquee-item:hover {
    transform: scale(1.03);
}

.marquee-item img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.marquee-item-info {
    padding: 0.85rem 1rem;
}

.marquee-item-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.2rem;
}

.marquee-item-info p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   People
   ============================================ */
.people {
    background: var(--white);
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

a.person-card {
    text-decoration: none;
    color: inherit;
    display: block;
}

.person-card {
    text-align: center;
    padding: 1.5rem 1rem;
    border-radius: var(--radius);
    transition: background var(--transition);
}

.person-card:hover {
    background: var(--cadia-light);
}


.person-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1rem;
    display: block;
    filter: grayscale(100%);
    letter-spacing: 0.02em;
}

.person-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.person-title {
    font-size: 0.88rem;
    color: var(--cadia-green);
    font-weight: 500;
    margin-bottom: 0.15rem;
}

.person-dept {
    font-size: 0.85rem;
    color: var(--text-light);
}

.labs-notice {
    background: #fff8e1;
    border: 1px solid #ffe082;
    border-radius: var(--radius);
    padding: 0.6rem 1.2rem;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #7b6b2e;
    display: inline-block;
}

.people-note {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-light);
    font-style: italic;
}

/* ============================================
   Events
   ============================================ */
.events {
    background: var(--off-white);
}

.events-grid {
    display: grid;
    gap: 1.25rem;
}

.event-card {
    display: flex;
    gap: 1.5rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
    align-items: flex-start;
}

.event-card:hover {
    box-shadow: var(--shadow-md);
}

.event-featured {
    border-left: 4px solid var(--cadia-green);
}

.event-date {
    flex-shrink: 0;
    text-align: center;
    min-width: 60px;
    padding-top: 0.15rem;
}

.event-month {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--cadia-green);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.event-year {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.event-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}

.event-info p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0.6rem;
}

.event-tag {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    background: var(--cadia-light);
    color: var(--cadia-dark);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.events-subheading {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-light);
    margin-bottom: 1rem;
    margin-top: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.events-subheading:first-of-type {
    margin-top: 0;
}

.events-see-all {
    text-align: center;
    margin-top: 2.5rem;
}

.events-see-all a {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border: 1.5px solid var(--cadia-green);
    color: var(--cadia-green);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all var(--transition);
}

.events-see-all a:hover {
    background: var(--cadia-green);
    color: var(--white);
}

/* ============================================
   Partners
   ============================================ */
.partners {
    background: var(--white);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    align-items: center;
    justify-items: center;
}

.partner-logo {
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: grayscale(40%);
    opacity: 0.7;
    transition: all var(--transition);
}

.partner-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-logo img {
    max-height: 75px;
    width: auto;
    object-fit: contain;
}

/* ============================================
   Facilities
   ============================================ */
.facilities {
    background: var(--white);
}

.facilities-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
    align-items: start;
}

.facilities-text h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.facilities-text p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.facilities-link {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border: 1.5px solid var(--cadia-green);
    color: var(--cadia-green);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all var(--transition);
}

.facilities-link:hover {
    background: var(--cadia-green);
    color: var(--white);
}

.facilities-calendar {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.facilities-calendar iframe {
    width: 100%;
    height: 400px;
    border: 0;
}

/* ============================================
   Contact
   ============================================ */
.contact {
    background: var(--dark);
    color: var(--white);
}

.contact .section-header h2 {
    color: var(--white);
}

.contact .section-line {
    background: var(--cadia-accent);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-item h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--cadia-accent);
    margin-bottom: 0.75rem;
}

.contact-item p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
}

.contact-item a {
    color: var(--cadia-mint);
}

.contact-item a:hover {
    color: var(--white);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Contact Form */
.contact-form h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--cadia-accent);
    margin-bottom: 1.25rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 0.35rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    color: var(--white);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cadia-accent);
}

.form-group textarea {
    resize: vertical;
}

.form-submit {
    display: inline-block;
    padding: 0.7rem 1.8rem;
    background: var(--cadia-green);
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background var(--transition);
    margin-top: 0.5rem;
}

.form-submit:hover {
    background: var(--cadia-accent);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--dark);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 1.5rem 2rem;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-ru-logo {
    height: 30px;
    width: auto;
    opacity: 0.7;
}

.footer-text {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-center {
    display: flex;
    align-items: center;
}

.footer-cadia-logo {
    height: 24px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.5;
}

.footer-right p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .labs-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .people-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about-stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .facilities-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem 2rem 1.5rem;
        gap: 0;
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        color: var(--text-primary) !important;
        padding: 0.6rem 0;
        display: block;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-logo {
        width: 200px;
    }

    .section {
        padding: 3.5rem 1.25rem;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

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

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

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .event-card {
        flex-direction: column;
        gap: 0.75rem;
    }

    .event-date {
        text-align: left;
        display: flex;
        gap: 0.5rem;
        align-items: baseline;
    }

    .footer-inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .people-grid {
        grid-template-columns: 1fr;
    }

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

    .hero h1 {
        font-size: 1.5rem;
    }
}