/* CSS Custom Properties - Hidden Gem Theme */
:root {
    /* Core */
    --primary: #3A4A47;                 /* Darker Hidden Gem */
    --primary-rgb: 58,74,71;

    /* Neutrals */
    --neutral-0: #F1EDE1;               /* Blank Canvas (DC-003) */
    --neutral-1: #CBC3B8;               /* Wheat Bread (720C-3) */
    --neutral-2: #ADA293;               /* Smoked Tan (HDC-NT-14) */

    /* Accents */
    --accent: #695F64;                  /* Curtain Call (N570-5) */
    --accent-rgb: 105,95,100;
    --cool-accent: #BBBDA6;             /* Urban Nature (S380-3) */
    
    /* Text */
    --text: #2b2f2e;
    --heading: #1f2625;

    /* Utilities */
    --white: #ffffff;
    --glass: rgba(255,255,255,0.9);
}

/* Base Styles */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--primary);
    color: var(--neutral-0);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Remove underlines from all links */
a {
    text-decoration: none;
}

/* Layout & Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header & Navigation */
.header {
    background-color: var(--primary);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--neutral-0);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-0);
    letter-spacing: -0.025em;
}

.nav-links {
    display: none;
}

.nav-links.desktop {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--neutral-0);
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--cool-accent);
}

.nav-link.active {
    color: var(--cool-accent);
    font-weight: 600;
    background-color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: 2px solid var(--neutral-0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.contact-btn {
    background-color: var(--accent);
    color: var(--white);
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-weight: 500;
    transition: all 0.2s ease;
    transform: scale(1);
}

.contact-btn:hover {
    background-color: var(--cool-accent);
    transform: scale(1.05);
}

.mobile-menu-btn {
    display: none;
    color: var(--neutral-0);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    padding: 0 1.5rem 1rem;
}

.mobile-menu.show {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 0.5rem 0;
    color: var(--neutral-0);
    transition: color 0.2s ease;
}

.mobile-menu a:hover {
    color: var(--cool-accent);
}

.mobile-menu a.active {
    color: var(--cool-accent);
    font-weight: 600;
}

.mobile-menu .contact-btn {
    margin-top: 0.5rem;
    text-align: center;
}

/* Hero Section */
.hero {
    padding: 5rem 1.5rem;
    background-color: var(--primary);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
}

.hero-text {
    text-align: center;
    max-width: 50%;
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 700;
    color: var(--neutral-0);
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--cool-accent);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--neutral-0);
    max-width: 36rem;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all 0.2s ease;
    transform: scale(1);
}

.btn-primary:hover {
    background-color: var(--cool-accent);
    transform: scale(1.05);
}

.btn-secondary {
    background-color: var(--neutral-1);
    color: var(--text);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all 0.2s ease;
    transform: scale(1);
}

.btn-secondary:hover {
    background-color: var(--neutral-2);
    transform: scale(1.05);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-link {
    color: var(--neutral-0);
    transition: color 0.2s ease;
}

.social-link:hover {
    color: var(--cool-accent);
}

.social-icon {
    width: 2rem;
    height: 2rem;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.hero-image-container {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--primary), var(--accent), var(--cool-accent));
    border-radius: 50%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: gradient-animation 10s ease infinite;
}

.hero-image-container img {

    border-radius: 50%;
    object-fit: cover;
    /* border: 1rem solid var(--neutral-0); */
}

/* Page Headers */
.page-header {
    /* background: linear-gradient(135deg, var(--primary), var(--accent)); */
    padding: 5rem 1.5rem;
    text-align: center;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--neutral-0);
    margin-bottom: 1rem;
}

.page-description {
    font-size: 1.25rem;
    color: var(--neutral-0);
    max-width: 48rem;
    margin: 0 auto;
}

/* Sections */
.section {
    padding: 6rem 1.5rem;
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--neutral-0);
    margin-bottom: 3rem;
    text-align: center;
}

/* About Section */
.about-section {
    background-color: var(--primary);
}

.about-content {
    max-width: 64rem;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--neutral-0);
}

.about-grid {
    margin-top: 5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.about-card {
    background-color: var(--neutral-0);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--neutral-1);
}

.about-card h3 {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 1rem;
}

.about-card svg {
    width: 2rem;
    height: 2rem;
    margin-right: 0.75rem;
}

.about-card .education-icon {
    color: var(--primary);
}

.about-card .honors-icon {
    color: var(--accent);
}

.about-card h4 {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--heading);
    margin-bottom: 0.5rem;
}

.about-card p {
    color: var(--text);
    margin-bottom: 0.5rem;
}

.about-card .small {
    font-size: 0.875rem;
    color: var(--neutral-2);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    background-color: var(--neutral-0);
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--neutral-1);
}

.project-card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.project-header {
    flex: 0 0 40%;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-header.blue {
    background-color: var(--primary);
}

.project-header.indigo {
    background-color: var(--accent);
}

.project-header.purple {
    background-color: var(--cool-accent);
}

.project-tags {
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-0);
    margin-bottom: 0.5rem;
}

.project-subtitle {
    color: var(--neutral-0);
    margin-bottom: 1rem;
}

.project-content {
    flex: 0 0 60%;
    padding: 2rem;
}

.project-content h4 {
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--heading);
}

.project-list {
    list-style-type: disc;
    list-style-position: inside;
    margin-bottom: 1rem;
    color: var(--text);
}

.project-list li {
    margin-bottom: 0.5rem;
}

.impact-box {
    background-color: var(--primary);
    border-left: 4px solid var(--accent);
    color: var(--neutral-0);
    padding: 1rem;
    border-radius: 0 0.5rem 0.5rem 0;
}

.impact-box .impact-title {
    font-weight: 700;
}

.impact-box .impact-text {
    font-size: 0.875rem;
}

/* Skills Section */
.skills-section {
    background-color: var(--primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-card {
    background-color: var(--neutral-0);
    padding: 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    border: 1px solid var(--neutral-1);
}

.skill-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.skill-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--heading);
}

.skill-card p {
    color: var(--text);
}

/* Publications Section */
.publications-container {
    max-width: 64rem;
    margin: 0 auto;
}

.publication-item {
    background-color: var(--neutral-0);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--neutral-1);
}

.publication-item:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.publication-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.publication-text {
    color: var(--text);
}

.publication-author {
    font-weight: 600;
    color: var(--primary);
}

.publication-journal {
    font-style: italic;
    color: var(--neutral-2);
}

.publication-link {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    transition: text-decoration 0.2s ease;
}

.publication-link:hover {
    text-decoration: underline;
}

/* Contact Section */
.contact-section {
    background-color: var(--primary);
    color: var(--white);
    text-align: center;
}

.contact-avatar {
    width: 6rem;
    height: 6rem;
    background: linear-gradient(135deg, var(--accent), var(--cool-accent));
    border-radius: 50%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.contact-avatar img {
    width: 5rem;
    height: 5rem;
    border-radius: 50%;
    object-fit: cover;
    border: 1rem solid var(--primary);
}

.contact-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--neutral-0);
}

.contact-description {
    font-size: 1.125rem;
    color: var(--neutral-0);
    max-width: 42rem;
    margin: 0 auto 2rem;
}

.contact-btn-large {
    background-color: var(--accent);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-size: 1.125rem;
    font-weight: 700;
    transition: all 0.2s ease;
    transform: scale(1);
    display: inline-block;
    text-decoration: none;
}

.contact-btn-large:hover {
    background-color: var(--cool-accent);
    transform: scale(1.05);
}

/* Footer */
.footer {
    background-color: var(--primary);
    color: var(--neutral-0);
    padding: 2rem 0;
    border-top: 1px solid var(--neutral-1);
    text-align: center;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-6 {
    margin-bottom: 1.5rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.mt-2 {
    margin-top: 0.5rem;
}

.mt-8 {
    margin-top: 2rem;
}

.mt-10 {
    margin-top: 2.5rem;
}

.mt-12 {
    margin-top: 3rem;
}

.mt-20 {
    margin-top: 5rem;
}

.space-y-2 > * + * {
    margin-top: 0.5rem;
}

.space-y-4 > * + * {
    margin-top: 1rem;
}

.space-y-6 > * + * {
    margin-top: 1.5rem;
}

.space-x-4 > * + * {
    margin-left: 1rem;
}

.space-x-6 > * + * {
    margin-left: 1.5rem;
}

.space-x-8 > * + * {
    margin-left: 2rem;
}

/* Responsive Design */
@media (min-width: 768px) {
    .hero-content {
        flex-direction: row;
        align-items: center;
    }
    
    .hero-text {
        text-align: left;
        margin-bottom: 0;
    }
    
    .hero-buttons {
        justify-content: flex-start;
    }
    
    .social-links {
        justify-content: flex-start;
    }
    
    .hero-image-container {
        width: 24rem;
        height: 24rem;
    }
    
    .hero-image-container img {
        width: 400px;
        height: 400px;
    }
    
    .project-card {
        flex-direction: row;
    }
    
    .nav-links.mobile {
        display: none;
    }
    
    .mobile-menu-btn {
        display: none;
    }
}

@media (max-width: 767px) {
    .nav-links.desktop {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .page-title {
        font-size: 2.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
}

/* Animation for the hero image gradient */
.animated-gradient {
    background-size: 200% 200%;
    animation: gradient-animation 10s ease infinite;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Styles for scroll animations */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Tag Styles */
.tag {
    display: inline-block;
    background-color: var(--accent);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: 0.5rem;
    padding: 0.125rem 0.625rem;
    border-radius: 9999px;
    border: 1px solid var(--neutral-1);
}

/* Project Sections */
.project-section {
    margin-bottom: 4rem;
    padding: 2rem;
    background-color: var(--neutral-0);
    border-radius: 1rem;
    border: 1px solid var(--neutral-1);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

.project-section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.project-section-subtitle {
    font-size: 1.125rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 2rem;
    font-style: italic;
}

.project-overview {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    gap: 2rem;
}

.project-meta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    flex: 1;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.meta-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.meta-value {
    font-size: 1rem;
    color: var(--text);
    font-weight: 500;
}

.project-content-section {
    border-top: 2px solid var(--neutral-1);
    padding-top: 2rem;
}

.project-content-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 1rem;
    margin-top: 2rem;
}

.project-content-section h3:first-child {
    margin-top: 0;
}

.project-content-section p {
    color: var(--text);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.project-content-section ul {
    margin-bottom: 1.5rem;
}

.project-content-section li {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

/* Responsive adjustments for project sections */
@media (max-width: 768px) {
    .project-overview {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .project-meta-grid {
        grid-template-columns: 1fr;
    }
    
    .project-section {
        padding: 1.5rem;
    }
    
    .project-section-title {
        font-size: 1.5rem;
    }
}

/* Research Impact Section */
.research-impact-section {
    background-color: var(--neutral-1);
}

.section-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text);
    max-width: 48rem;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

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

.chart-container {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--neutral-2);
}

.chart-container h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading);
    margin-bottom: 1.5rem;
    text-align: center;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.metric-card {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 0.75rem;
    color: var(--white);
    transition: transform 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-5px);
}

.metric-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--neutral-0);
}

.metric-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--neutral-0);
}

#citations-chart {
    width: 100% !important;
    height: auto !important;
    max-height: 300px;
}

#research-areas-chart {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Responsive adjustments for research impact */
@media (min-width: 768px) {
    .impact-charts {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
}

@media (max-width: 767px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .metric-number {
        font-size: 2rem;
    }
    
    .chart-container {
        padding: 1.5rem;
    }
}