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

:root {
    --color-bg: #FAF8F5;
    --color-bg-alt: #F3F0EB;
    --color-text: #2D2D2D;
    --color-text-secondary: #5C5C5C;
    --color-accent: #8B7355;
    --color-accent-hover: #6B5A45;
    --color-border: #E5E0D8;
    --color-white: #FFFFFF;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

p {
    color: var(--color-text-secondary);
}

.large-text {
    font-size: 1.25rem;
    line-height: 1.8;
}

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

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

.text-link {
    font-weight: 500;
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
}

.text-link:hover {
    border-bottom-color: transparent;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    background-color: var(--color-text);
    color: var(--color-white);
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.9375rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.btn:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-white);
    transform: translateY(-1px);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--color-text);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 100%;
    height: 1.5px;
    background-color: var(--color-text);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 12rem 0 6rem;
    text-align: center;
}

.hero h1 {
    max-width: 800px;
    margin: 0 auto 1.5rem;
}

.hero-lead {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--color-text-secondary);
}

/* Page Hero */
.page-hero {
    padding: 10rem 0 4rem;
}

.page-hero h1 {
    margin-bottom: 1rem;
}

.page-lead {
    font-size: 1.125rem;
    max-width: 650px;
    color: var(--color-text-secondary);
}

/* Intro Section */
.intro {
    padding: 4rem 0 6rem;
    border-top: 1px solid var(--color-border);
}

.intro-content {
    max-width: 750px;
}

/* Pillars Section */
.pillars {
    padding: 6rem 0;
    background-color: var(--color-bg-alt);
}

.pillars h2 {
    margin-bottom: 3rem;
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.pillar {
    display: block;
    padding: 2rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: var(--transition);
    text-decoration: none;
}

.pillar:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.pillar:hover .pillar-icon {
    transform: scale(1.05);
}

.pillar-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    margin-bottom: 1.25rem;
    color: var(--color-accent);
    transition: var(--transition);
}

.pillar-icon svg {
    width: 100%;
    height: 100%;
}

.pillar-number {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
}

.pillar h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.pillar p {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    border-top: 1px solid var(--color-border);
}

.cta-content {
    max-width: 550px;
}

.cta-content h2 {
    margin-bottom: 1rem;
}

.cta-content p {
    margin-bottom: 2rem;
}

/* Content Sections */
.content-section {
    padding: 5rem 0;
    border-top: 1px solid var(--color-border);
}

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

.content-block {
    max-width: 750px;
}

.content-block p {
    margin-bottom: 1.5rem;
}

.content-block p:last-child {
    margin-bottom: 0;
}

/* Principles */
.principles-list {
    margin-top: 2.5rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.principle h3 {
    font-family: var(--font-serif);
    margin-bottom: 0.5rem;
}

.principle p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* Research Areas */
.research-areas {
    padding: 4rem 0 5rem;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.research-item {
    padding: 2rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: var(--transition);
}

.research-item:hover {
    border-color: var(--color-accent);
}

.research-item h3 {
    font-family: var(--font-serif);
    margin-bottom: 0.75rem;
}

.research-item p {
    font-size: 0.9375rem;
    margin-bottom: 1.25rem;
}

/* Publications */
.publications-list {
    margin-top: 2.5rem;
}

.publication {
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-border);
}

.publication:first-child {
    padding-top: 0;
}

.publication:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.publication-date {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.publication h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.publication p {
    font-size: 0.9375rem;
    margin-bottom: 1rem;
}

/* Team Section */
.team-section {
    padding: 4rem 0 5rem;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.team-member {
    padding: 2rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.member-photo {
    width: 80px;
    height: 80px;
    background-color: var(--color-bg-alt);
    border-radius: 50%;
    margin-bottom: 1.5rem;
}

.team-member h3 {
    font-family: var(--font-serif);
    margin-bottom: 0.25rem;
}

.member-role {
    display: block;
    font-size: 0.875rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.team-member p {
    font-size: 0.9375rem;
}

/* Advisors */
.advisors-list {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.advisor h3 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.advisor p {
    font-size: 0.875rem;
}

/* Footer */
.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.footer-logo .logo-icon {
    width: 24px;
    height: 24px;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

/* Research Areas List (Approach page) */
.research-areas-list {
    margin-top: 2.5rem;
}

.research-area {
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-border);
}

.research-area:first-child {
    padding-top: 0;
}

.research-area:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.area-number {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.research-area h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.research-area p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* Section Number (Research page) */
.section-number {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
}

/* Project List */
.project-list {
    margin-top: 1.5rem;
    padding-left: 1.25rem;
}

.project-list li {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.project-list li:last-child {
    margin-bottom: 0;
}

/* Responsive */
@media (max-width: 900px) {
    .pillars-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .principles-list {
        grid-template-columns: 1fr;
    }

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

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

    .advisors-list {
        grid-template-columns: 1fr;
    }
}

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

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

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:first-child {
        transform: rotate(45deg) translate(4px, 4px);
    }

    .nav-toggle.active span:last-child {
        transform: rotate(-45deg) translate(4px, -4px);
    }

    .hero {
        padding: 9rem 0 4rem;
        text-align: left;
    }

    .hero h1 {
        margin: 0 0 1.5rem;
    }

    .page-hero {
        padding: 8rem 0 3rem;
    }

    .intro {
        padding: 3rem 0 4rem;
    }

    .pillars {
        padding: 4rem 0;
    }

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

    .content-section {
        padding: 4rem 0;
    }

    .cta-section {
        padding: 4rem 0;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    .large-text {
        font-size: 1.125rem;
    }
}