/* ========================
   CSS Variables & Reset
   ======================== */

:root {
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #E5E5E5;
    --color-gray-300: #CCCCCC;
    --color-gray-700: #333333;
    --color-green: #2d5016;
    --color-green-dark: #1f3810;

    --font-display: 'Fraunces', serif;
    --font-body: 'Crimson Text', serif;
    --font-mono: 'Space Mono', monospace;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-2xl: 8rem;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-white);
    color: var(--color-black);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
}

/* ========================
   Navigation
   ======================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-green);
    z-index: 1000;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
}

.nav-menu {
    display: flex;
    gap: 3rem;
    align-items: center;
}

.nav-link {
    color: var(--color-white);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-white);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 28px;
    height: 2px;
    background-color: var(--color-white);
    transition: var(--transition);
}

/* ========================
   Hero Section
   ======================== */

.hero {
    min-height: 100vh;
    padding: 140px 3rem 4rem;
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--color-white);
}

.hero-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 400px;
    grid-template-rows: auto auto;
    gap: 4rem;
    width: 100%;
}

.hero-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 900;
    line-height: 0.9;
    margin-bottom: 2rem;
}

.title-line {
    display: block;
    font-size: 4.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.title-line:nth-child(1) {
    animation-delay: 0.1s;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

.title-large {
    font-size: 7rem;
    letter-spacing: -0.02em;
}

.hero-roles {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-family: var(--font-body);
    font-size: 1.5rem;
    font-style: italic;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.3s;
}

.role-divider {
    font-size: 2rem;
    opacity: 0.3;
}

.hero-image-wrapper {
    grid-row: 1 / 3;
    grid-column: 2;
    position: relative;
    opacity: 0;
    animation: fadeIn 1s ease forwards 0.5s;
}

.image-frame {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
    border: 8px solid var(--color-black);
    background-color: var(--color-gray-100);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.image-frame:hover .hero-image {
    transform: scale(1.05);
}

.image-caption {
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.6;
    letter-spacing: 0.03em;
}

.hero-statement {
    grid-column: 1;
    font-size: 1.25rem;
    line-height: 1.8;
    max-width: 600px;
    border-left: 3px solid var(--color-black);
    padding-left: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.4s;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeIn 1s ease forwards 1s;
}

.scroll-line {
    width: 60px;
    height: 1px;
    background-color: var(--color-black);
}

/* ========================
   Section Numbers
   ======================== */

.section-number {
    position: absolute;
    top: 3rem;
    left: 3rem;
    font-family: var(--font-display);
    font-size: 8rem;
    font-weight: 300;
    color: var(--color-gray-200);
    line-height: 1;
    z-index: 1;
}

/* ========================
   About Section
   ======================== */

.about {
    position: relative;
    padding: var(--spacing-2xl) 3rem;
    background-color: var(--color-black);
    color: var(--color-white);
}

.about-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    gap: 4rem;
    align-items: start;
}

.about-header {
    position: sticky;
    top: 140px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 1rem;
}

.title-decoration {
    width: 80px;
    height: 4px;
    background-color: var(--color-white);
    margin-top: 2rem;
}

.about-intro {
    margin-bottom: 3rem;
}

.lead-text {
    font-size: 1.8rem;
    line-height: 1.5;
    font-weight: 300;
    margin-bottom: 2rem;
}

.about-body {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.content-block {
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    padding-left: 2rem;
}

.content-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.content-block p {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-cta {
    margin-top: 3rem;
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 1rem 2rem;
    border: 2px solid var(--color-white);
    background-color: transparent;
    color: var(--color-white);
    transition: var(--transition);
}

.btn-link:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.btn-link svg {
    transition: transform 0.3s ease;
}

.btn-link:hover svg {
    transform: translate(4px, -4px);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.highlight-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.highlight-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 300;
    opacity: 0.3;
    line-height: 1;
}

.highlight-content h4 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.highlight-content p {
    font-size: 0.95rem;
    opacity: 0.8;
}

/* ========================
   Research Timeline
   ======================== */

.research {
    position: relative;
    padding: var(--spacing-2xl) 3rem;
    background-color: var(--color-white);
}

.section-number {
    color: var(--color-gray-200);
}

.research-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 6rem;
}

.research-header {
    position: sticky;
    top: 140px;
}

.research-header .section-title {
    color: var(--color-black);
}

.timeline {
    position: relative;
    padding-left: 4rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-black), var(--color-gray-300));
}

.timeline-item {
    position: relative;
    margin-bottom: 4rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid var(--color-gray-200);
}

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

.timeline-marker {
    position: absolute;
    left: -4.5rem;
    top: 0;
    width: 14px;
    height: 14px;
    background-color: var(--color-black);
    border: 3px solid var(--color-white);
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--color-black);
}

.timeline-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    color: var(--color-gray-700);
}

.timeline-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.timeline-institution {
    font-size: 1.2rem;
    font-style: italic;
    margin-bottom: 1rem;
    color: var(--color-gray-700);
}

.timeline-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-gray-700);
}

.timeline-list {
    list-style: none;
    margin-top: 1rem;
}

.timeline-list li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
    line-height: 1.6;
}

.timeline-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-gray-700);
}

/* ========================
   MitSna Section
   ======================== */

.mitsna {
    position: relative;
    padding: var(--spacing-2xl) 3rem;
    background-color: var(--color-gray-100);
}

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

.mitsna-hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.mitsna-title {
    font-family: var(--font-display);
    line-height: 1;
    margin-bottom: 1.5rem;
}

.mitsna-label {
    display: block;
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.05em;
}

.mitsna-large {
    display: block;
    font-size: 6rem;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.mitsna-tagline {
    font-family: var(--font-body);
    font-size: 1.8rem;
    font-style: italic;
    color: var(--color-gray-700);
}

.mitsna-content {
    max-width: 900px;
    margin: 0 auto;
}

.mitsna-intro {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.intro-text {
    font-size: 1.4rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.mitsna-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-gray-700);
}

.mitsna-pillars {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    margin: var(--spacing-lg) 0;
}

.pillar-item {
    text-align: center;
    padding: 3rem 2rem;
    background-color: var(--color-white);
    border: 2px solid var(--color-black);
    transition: var(--transition);
}

.pillar-item:hover {
    transform: translateY(-8px);
    box-shadow: 12px 12px 0 var(--color-black);
}

.pillar-icon {
    margin: 0 auto 1.5rem;
    width: 48px;
    height: 48px;
}

.pillar-item h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.pillar-item p {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--color-gray-700);
}

.mitsna-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.btn-mitsna {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 1.5rem 3rem;
    background-color: var(--color-black);
    color: var(--color-white);
    border: none;
    transition: var(--transition);
}

.btn-mitsna:hover {
    background-color: var(--color-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

/* ========================
   Contact Section
   ======================== */

.contact {
    position: relative;
    padding: var(--spacing-2xl) 3rem;
    background-color: var(--color-white);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-title {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    line-height: 1;
}

.contact-intro {
    font-size: 1.3rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-700);
}

.contact-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.contact-item {
    text-align: left;
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    opacity: 0.6;
}

.contact-value {
    font-size: 1.3rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.contact-value:hover {
    color: var(--color-green);
    transform: translateX(4px);
}

.construction-note {
    margin-top: var(--spacing-lg);
    padding: 2rem;
    background-color: var(--color-gray-100);
    border-left: 4px solid var(--color-green);
    text-align: center;
}

.construction-note p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-gray-700);
}

.construction-note a {
    color: var(--color-green);
    font-weight: 600;
    text-decoration: underline;
    transition: var(--transition);
}

.construction-note a:hover {
    color: var(--color-black);
}

/* ========================
   Footer
   ======================== */

.footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 3rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-role {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-right {
    text-align: right;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* ========================
   Animations
   ======================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================
   Responsive Design
   ======================== */

@media (max-width: 1200px) {
    .hero-grid {
        grid-template-columns: 1fr 350px;
        gap: 3rem;
    }

    .title-large {
        font-size: 5.5rem;
    }

    .about-grid {
        grid-template-columns: 250px 1fr 300px;
        gap: 3rem;
    }

    .research-container {
        grid-template-columns: 300px 1fr;
        gap: 4rem;
    }
}

@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 85px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 85px);
        background-color: var(--color-green);
        flex-direction: column;
        justify-content: flex-start;
        padding: 3rem;
        gap: 2rem;
        transition: left 0.3s ease;
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: 1rem;
        padding: 1rem 0;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 120px 2rem 3rem;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 3rem;
    }

    .hero-image-wrapper {
        grid-row: 2;
        grid-column: 1;
    }

    .image-frame {
        height: 450px;
        max-width: 500px;
        margin: 0 auto;
    }

    .hero-statement {
        grid-row: 3;
        max-width: 100%;
    }

    .title-line {
        font-size: 3rem;
    }

    .title-large {
        font-size: 4.5rem;
    }

    .hero-roles {
        font-size: 1.3rem;
    }

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

    .about-header {
        position: static;
        margin-bottom: 2rem;
    }

    .section-title {
        font-size: 3.5rem;
    }

    .lead-text {
        font-size: 1.6rem;
    }

    .about-highlights {
        margin-top: 3rem;
    }

    .research-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .research-header {
        position: static;
        margin-bottom: 2rem;
    }

    .timeline {
        padding-left: 3rem;
    }

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

    .mitsna-label {
        font-size: 2.2rem;
    }

    .mitsna-large {
        font-size: 5rem;
    }

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

    .contact-item {
        text-align: center;
    }

    .construction-note {
        padding: 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

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

    .section-number {
        font-size: 4.5rem;
        opacity: 0.5;
    }

    .scroll-indicator {
        bottom: 2.5rem;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 0 1.5rem;
    }

    .hero {
        padding: 100px 1.5rem 2rem;
        min-height: auto;
    }

    .hero-grid {
        gap: 2rem;
    }

    .title-line {
        font-size: 2rem;
    }

    .title-large {
        font-size: 3rem;
    }

    .hero-label {
        font-size: 0.75rem;
        margin-bottom: 1rem;
    }

    .hero-roles {
        font-size: 1.1rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .role-divider {
        font-size: 1.5rem;
    }

    .hero-statement {
        font-size: 1rem;
        padding-left: 1rem;
        border-left-width: 2px;
    }

    .image-frame {
        height: 400px;
    }

    .image-caption {
        font-size: 0.7rem;
    }

    .about,
    .research,
    .mitsna,
    .contact {
        padding: var(--spacing-lg) 1.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .lead-text {
        font-size: 1.3rem;
    }

    .content-block {
        padding-left: 1rem;
    }

    .content-label {
        font-size: 0.7rem;
    }

    .content-block p {
        font-size: 1rem;
    }

    .btn-link {
        font-size: 0.8rem;
        padding: 0.8rem 1.5rem;
    }

    .highlight-number {
        font-size: 2rem;
    }

    .highlight-content h4 {
        font-size: 1.1rem;
    }

    .highlight-content p {
        font-size: 0.85rem;
    }

    .timeline {
        padding-left: 2.5rem;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-marker {
        left: -3rem;
        width: 12px;
        height: 12px;
    }

    .timeline-year {
        font-size: 0.75rem;
    }

    .timeline-title {
        font-size: 1.5rem;
    }

    .timeline-institution {
        font-size: 1rem;
    }

    .timeline-desc,
    .timeline-list li {
        font-size: 0.95rem;
    }

    .contact-title {
        font-size: 3rem;
    }

    .contact-intro {
        font-size: 1.1rem;
    }

    .contact-label {
        font-size: 0.7rem;
    }

    .contact-value {
        font-size: 1.1rem;
    }

    .construction-note {
        padding: 1.5rem 1rem;
    }

    .construction-note p {
        font-size: 1rem;
    }

    .mitsna-label {
        font-size: 2rem;
    }

    .mitsna-large {
        font-size: 3.5rem;
    }

    .mitsna-tagline {
        font-size: 1.4rem;
    }

    .intro-text {
        font-size: 1.2rem;
    }

    .mitsna-intro p {
        font-size: 1rem;
    }

    .pillar-item {
        padding: 2rem 1.5rem;
    }

    .pillar-item h3 {
        font-size: 1.3rem;
    }

    .pillar-item p {
        font-size: 0.95rem;
    }

    .btn-mitsna {
        font-size: 0.9rem;
        padding: 1.2rem 2rem;
    }

    .section-number {
        font-size: 3rem;
        top: 1rem;
        left: 1rem;
    }

    .scroll-indicator {
        left: 1.5rem;
        bottom: 2rem;
        font-size: 0.7rem;
    }

    .scroll-line {
        width: 40px;
    }

    .footer {
        padding: 2rem;
    }

    .footer-name {
        font-size: 1.2rem;
    }

    .footer-role {
        font-size: 0.75rem;
    }

    .footer-right {
        font-size: 0.8rem;
    }
}