:root {
    --color-primary: #1a3c34;
    --color-primary-light: #2d5f50;
    --color-accent: #c8a96e;
    --color-accent-light: #e0cfa0;
    --color-bg: #faf9f6;
    --color-bg-alt: #f0ede6;
    --color-text: #2c2c2c;
    --color-text-light: #6b6b6b;
    --color-white: #ffffff;
    --font-serif: 'Noto Serif SC', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius: 8px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 16px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    font-family: var(--font-sans);
}

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

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(250, 249, 246, 0.95);
    backdrop-filter: blur(12px);
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-white);
    text-decoration: none;
    letter-spacing: 2px;
}

.navbar.scrolled .nav-logo {
    color: var(--color-primary);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    transition: color var(--transition);
}

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

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

.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(--color-white);
    border-radius: 2px;
    transition: all var(--transition);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #1a3c34 0%, #2d5f50 40%, #3a7a66 70%, #1a3c34 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30z' fill='%23ffffff' fill-opacity='0.02'/%3E%3C/svg%3E");
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(26,60,52,0.4) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-tagline {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.75);
    max-width: 540px;
    margin: 0 auto 36px;
    font-weight: 300;
    line-height: 1.8;
}

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

.hero .btn-primary:hover {
    background: var(--color-accent-light);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255,255,255,0.4);
    border-bottom: 2px solid rgba(255,255,255,0.4);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translate(0,0); opacity: 1; }
    50% { transform: rotate(45deg) translate(4px,4px); opacity: 0.5; }
}

.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 60px;
    align-items: start;
    margin-top: 48px;
}

.image-placeholder {
    width: 280px;
    height: 340px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--color-text-light);
    border: 2px dashed var(--color-accent);
}

.image-placeholder svg {
    width: 80px;
    height: 80px;
    color: var(--color-accent);
}

.about-text .lead {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text p {
    color: var(--color-text-light);
    margin-bottom: 16px;
}

.about-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-bg-alt);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-light);
}

.detail-value {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.95rem;
}

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

.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 48px;
}

.research-card {
    padding: 36px 28px;
    background: var(--color-bg);
    border-radius: var(--radius);
    transition: all var(--transition);
    border: 1px solid transparent;
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.research-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: 50%;
    margin-bottom: 20px;
}

.research-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

.research-card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.research-card p {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.gallery-item {
    aspect-ratio: var(--aspect, 4/3);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition);
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-placeholder {
    width: 100%;
    height: 100%;
    background: var(--color-bg-alt);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--color-text-light);
    border: 2px dashed var(--color-accent);
    border-radius: var(--radius);
}

.gallery-placeholder svg {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
}

.gallery-placeholder span {
    font-size: 0.9rem;
    font-weight: 500;
}

.timeline-section {
    background: linear-gradient(135deg, #1a3c34 0%, #2d5f50 100%);
    color: var(--color-white);
}

.timeline-section .section-title {
    color: var(--color-white);
}

.timeline-section .section-title::after {
    background: var(--color-accent);
}

.timeline {
    position: relative;
    margin-top: 48px;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(200, 169, 110, 0.3);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-marker {
    position: absolute;
    left: -36px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-primary);
}

.timeline-content {
    background: rgba(255,255,255,0.08);
    padding: 24px 28px;
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.1);
    transition: background var(--transition);
}

.timeline-content:hover {
    background: rgba(255,255,255,0.12);
}

.timeline-content h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.8);
    line-height: 1.7;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 48px;
    margin-top: 48px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 28px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: var(--color-bg-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.contact-item h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.95rem;
    color: var(--color-text);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    background: var(--color-white);
    transition: border-color var(--transition);
    color: var(--color-text);
}

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

.form-group textarea {
    resize: vertical;
}

.contact-form .btn-primary {
    align-self: flex-start;
}

.footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.7);
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: var(--color-white);
    margin-bottom: 4px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(250,249,246,0.98);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
    }

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

    .nav-links a {
        color: var(--color-text) !important;
    }

    .nav-toggle {
        display: flex;
    }

    .about-grid {
        grid-template-columns: 1fr;
        justify-items: center;
    }

    .about-details {
        grid-template-columns: 1fr;
    }

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

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

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

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .section {
        padding: 72px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 1024px) {
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.4rem;
    }

    .hero-tagline {
        font-size: 1rem;
    }

    .about-text .lead {
        font-size: 1.05rem;
    }

    .image-placeholder {
        width: 220px;
        height: 280px;
    }
}