/* ===== CSS VARIABLES ===== */
:root {
    /* Colors from logo - blues and warm tones */
    --primary-blue: hsl(200, 65%, 45%);
    --primary-blue-dark: hsl(200, 70%, 35%);
    --primary-blue-light: hsl(200, 60%, 85%);
    --accent-teal: hsl(185, 55%, 50%);
    --accent-brick: hsl(15, 45%, 45%);
    /* Keeping for legacy, but using new blue for Damage */
    --accent-blue-deep: hsl(220, 60%, 40%);
    /* New color for Damage tab */
    --accent-warm: hsl(30, 40%, 60%);

    /* Neutral colors */
    --bg-primary: hsl(210, 20%, 98%);
    --bg-secondary: hsl(210, 25%, 95%);
    --bg-dark: hsl(210, 30%, 12%);
    --bg-card: hsl(0, 0%, 100%);

    /* Text colors */
    --text-primary: hsl(210, 25%, 15%);
    --text-secondary: hsl(210, 15%, 35%);
    --text-light: hsl(210, 10%, 60%);
    --text-inverse: hsl(0, 0%, 100%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-teal) 100%);
    --gradient-warm: linear-gradient(135deg, var(--accent-brick) 0%, var(--accent-warm) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.4) 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Outfit', var(--font-primary);

    /* Shadows */
    --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);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

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

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

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-md);
    text-align: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.subsection-title {
    font-size: 1.75rem;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--text-primary);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-blue);
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--gradient-primary);
    transition: transform var(--transition-base);
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #1a1a1a;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 2s ease-in-out;
    animation: kenBurns 20s ease-in-out infinite;
}

.hero-slide.active {
    opacity: 1;
}

@keyframes kenBurns {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.75) 100%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: #ffffff;
    padding: var(--spacing-md);
    max-width: 1000px;
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    margin-bottom: var(--spacing-sm);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: #ffffff;
    text-shadow:
        3px 3px 6px rgba(0, 0, 0, 0.8),
        0 0 20px rgba(0, 0, 0, 0.6),
        0 0 40px rgba(0, 0, 0, 0.4);
}

.hero-subtitle-large {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #ffffff;
    text-shadow:
        2px 2px 4px rgba(0, 0, 0, 0.8),
        0 0 15px rgba(0, 0, 0, 0.6);
}

.hero-static {
    display: block;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.hero-rotating {
    display: block;
    background: linear-gradient(135deg, var(--accent-teal) 0%, var(--primary-blue-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-height: 1.2em;
    animation: fadeIn 0.5s ease;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-blue-light);
}

.hero-tagline {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--text-inverse);
    transform: translateY(-2px);
}

.hero-cta .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.hero-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        top: 10px;
        opacity: 1;
    }

    100% {
        top: 30px;
        opacity: 0;
    }
}

/* ===== ABOUT SECTION ===== */
.about-section {
    background: var(--bg-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.about-main {
    font-size: 1.125rem;
    line-height: 1.8;
    font-family: var(--font-primary);
    color: var(--text-secondary);
}



.about-main p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.mission-card {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.mission-card h3 {
    color: var(--text-inverse);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.mission-card p {
    line-height: 1.8;
    font-size: 1.125rem;
}

/* ===== CAROUSEL STYLES ===== */
.carousel-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
    padding: var(--spacing-sm) 0;
}

.diff-carousel {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.diff-card {
    /* Default to 1 item per screen (mobile) */
    --items-per-screen: 1;
    min-width: calc(100% / var(--items-per-screen));
    flex: 0 0 calc(100% / var(--items-per-screen));
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.05);
    text-align: center;
    /* Add spacing between cards using border-box and padding */
    box-sizing: border-box;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    background-clip: padding-box;
}

/* Tablet: 2 items */
@media (min-width: 768px) {
    .diff-card {
        --items-per-screen: 2;
    }
}

/* Desktop: 3 items */
@media (min-width: 1024px) {
    .diff-card {
        --items-per-screen: 3;
    }
}

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

.diff-icon-svg {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary-blue);
}

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

.diff-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-blue);
}

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

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-card);
    border: 1px solid rgba(0, 0, 0, 0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    z-index: 10;
}

.carousel-btn:hover {
    background: var(--primary-blue);
    color: white;
    box-shadow: var(--shadow-md);
}

.prev-btn {
    left: 0;
}

.next-btn {
    right: 0;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: var(--spacing-md);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all var(--transition-base);
}

.dot.active {
    background: var(--primary-blue);
    transform: scale(1.2);
}

/* ===== RESEARCH SECTION ===== */
.research-section {
    background: var(--bg-secondary);
}

.research-tabs-container {
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: center;
}

.research-tabs {
    display: flex;
    gap: var(--spacing-md);
    background: var(--bg-card);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: all var(--transition-base);
    min-width: 140px;
}

.tab-btn:hover {
    background: rgba(0, 0, 0, 0.03);
}

.tab-btn.active {
    background: var(--primary-blue);
    color: white;
    box-shadow: var(--shadow-md);
}

.tab-icon {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.tab-text {
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: 0.05em;
}

.tab-subtitle {
    font-size: 0.75rem;
    opacity: 0.8;
    font-weight: 500;
}

/* Specific colors for active tabs if desired, currently using primary blue for all */
/* 
.tab-btn[data-tab="damage"].active { background: var(--accent-brick); }
.tab-btn[data-tab="data"].active { background: var(--primary-blue); }
.tab-btn[data-tab="design"].active { background: var(--accent-teal); }
*/

.tab-content-container {
    position: relative;
    min-height: 400px;
    /* Prevent jumpiness */
}

.tab-pane {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.research-sub-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.sub-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-blue);
    /* Default border color */
    transition: all var(--transition-base);
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.sub-card-image {
    width: 200px;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 0;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.sub-card-content {
    flex-grow: 1;
}

.sub-card:hover .sub-card-image {
    transform: scale(1.02);
}

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

.sub-card h3 {
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.sub-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 1rem;
    flex-grow: 1;
}

/* Color coding for sub-cards based on parent tab context - handled via CSS if we wrap them or just generic */
#damage .sub-card {
    border-left-color: var(--accent-blue-deep);
}

#data .sub-card {
    border-left-color: var(--primary-blue);
}

#design .sub-card {
    border-left-color: var(--accent-teal);
}

/* Active tab button colors */
.tab-btn[data-tab="damage"].active {
    background: var(--accent-blue-deep);
}

.tab-btn[data-tab="data"].active {
    background: var(--primary-blue);
}

.tab-btn[data-tab="design"].active {
    background: var(--accent-teal);
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .research-tabs {
        flex-direction: column;
        width: 100%;
    }

    .tab-btn {
        width: 100%;
        flex-direction: row;
        justify-content: flex-start;
        padding: var(--spacing-md);
    }

    .tab-icon {
        margin-bottom: 0;
        margin-right: var(--spacing-sm);
    }

    .tab-text {
        margin-right: auto;
    }
}

/* ===== PEOPLE SECTION ===== */
.people-section {
    background: var(--bg-primary);
}

.director-section {
    margin-bottom: var(--spacing-xl);
}

.person-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.person-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.person-photo {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.director-card .person-photo {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 4px solid rgba(255, 255, 255, 0.3);
    margin: 0 auto var(--spacing-md);
    display: block;
}

.director-card {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.director-card h3,
.director-card .person-title,
.director-card .person-affiliation,
.director-card .person-bio {
    color: var(--text-inverse);
}

.person-content h3,
.person-content h4 {
    margin-bottom: var(--spacing-xs);
}

.person-title {
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.director-card .person-title {
    color: var(--primary-blue-light);
}

.person-affiliation {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.person-bio {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.person-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.person-link {
    font-size: 1.5rem;
    opacity: 0.8;
    transition: all var(--transition-fast);
}

.person-link:hover {
    opacity: 1;
    transform: scale(1.2);
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

/* ===== PUBLICATIONS SECTION ===== */
.publications-section {
    background: var(--bg-secondary);
}

.publications-list {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.publication-item {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.publication-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary-blue);
}

.publication-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.publication-type-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.publication-year-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: var(--shadow-sm);
}

.publication-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: var(--spacing-sm);
}

.publication-journal {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.publication-links {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.publication-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-teal);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.publication-link:hover {
    color: var(--primary-blue);
    transform: translateX(4px);
}

.publication-link span {
    font-size: 1.1rem;
}

.loading {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-light);
    font-size: 1.125rem;
    grid-column: 1 / -1;
}

.publication-view-all {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    grid-column: 1 / -1;
}

.publication-view-all .btn {
    display: inline-block;
}


/* ===== TEACHING SECTION ===== */
.teaching-section {
    background: var(--bg-primary);
}

.teaching-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.teaching-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.teaching-card h3 {
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

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

/* ===== CONTACT SECTION ===== */
.contact-section {
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-info h3 {
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.contact-email {
    margin-top: var(--spacing-md);
}

.contact-email a {
    color: var(--accent-teal);
    font-weight: 600;
}

.contact-email a:hover {
    color: var(--primary-blue);
}

.contact-cta {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.contact-cta p {
    color: var(--text-inverse);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.contact-cta .btn {
    background: var(--bg-card);
    color: var(--primary-blue);
}

.contact-cta .btn:hover {
    background: var(--bg-primary);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.footer-tagline {
    font-family: var(--font-display);
    font-size: 1.125rem;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-teal);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
    font-size: 0.9rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        max-width: 300px;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        border-radius: var(--radius-md) 0 0 var(--radius-md);
        transition: right var(--transition-base);
        align-items: flex-start;
    }

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

    .hamburger {
        display: flex;
    }

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

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

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

    .mission-card {
        position: static;
    }
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-lg) 0;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

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

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

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

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

@media (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

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

    .hero-static {
        font-size: 1.25rem;
    }
}

/* =========================================
   RESPONSIVE REFACTOR (Mobile Fixes)
   ========================================= */

/* Ensure images never overflow their containers */
img {
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {

    /* Research Sub-Cards: Stack vertically on mobile */
    .sub-card {
        flex-direction: column;
        align-items: stretch;
    }

    .sub-card-image {
        width: 100%;
        height: 200px;
        /* Fixed height for consistency */
        margin-bottom: var(--spacing-md);
        margin-right: 0;
        /* Reset any right margin */
    }

    /* Ensure sub-grid doesn't overflow */
    .research-sub-grid {
        width: 100%;
        max-width: 100%;
    }
}