/* ============================================
   Gita Gopinath - Personal Website
   Clean, Modern Design
   ============================================ */

/* CSS Variables */
:root {
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #3182ce;
    --text-color: #2d3748;
    --text-light: #718096;
    --background: #ffffff;
    --background-alt: #f7fafc;
    --border-color: #e2e8f0;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
    --max-width: 1200px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-color);
    background: var(--background);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

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

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo span {
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

/* Mobile Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--background-alt) 0%, var(--background) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    max-width: 350px;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.hero-text h1 {
    margin-bottom: 0.5rem;
}

.hero-text .title {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.hero-text .bio {
    font-size: 1.05rem;
    color: var(--text-color);
}

.bio-link {
    display: inline-block;
    font-weight: 500;
    color: var(--accent-color);
    transition: var(--transition);
}

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

.contact-info {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.contact-info p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.contact-info strong {
    color: var(--primary-color);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--background-alt);
    color: var(--text-color);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-3px);
}

/* Featured Section */
.featured {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.featured-card {
    background: var(--background);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.featured-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.featured-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.featured-card-content {
    padding: 1.5rem;
}

.featured-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.featured-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.featured-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.featured-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--accent-color);
    padding: 0.35rem 0.75rem;
    background: var(--background-alt);
    border-radius: 4px;
    transition: var(--transition);
}

.featured-links a:hover {
    background: var(--accent-color);
    color: white;
}

.featured-links a i {
    font-size: 0.8rem;
}

/* Page Content */
.page-header {
    background: var(--background-alt);
    padding: 3rem 0;
    text-align: center;
}

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

/* Publications List */
.publications-section {
    margin-bottom: 3rem;
}

.publication-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.publication-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.publication-item .authors {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.publication-item .journal {
    font-style: italic;
    color: var(--text-color);
    font-size: 0.95rem;
}

.publication-item .links {
    margin-top: 0.75rem;
    display: flex;
    gap: 1rem;
}

.publication-item .links a {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
    background: var(--background-alt);
    border-radius: 4px;
}

.publication-item .links a:hover {
    background: var(--accent-color);
    color: white;
}

/* CV Page */
.cv-download {
    text-align: center;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--accent-color);
    color: white;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
}

.btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.cv-section {
    margin-bottom: 2.5rem;
}

.cv-section h3 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.cv-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 1rem;
}

.cv-item .date {
    min-width: 120px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.cv-item .details h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.cv-item .details p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Speeches & Media */
.item-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.list-item {
    padding: 1.5rem;
    background: var(--background-alt);
    border-radius: 8px;
    transition: var(--transition);
}

.list-item:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.list-item .date {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.list-item h4 {
    margin-bottom: 0.5rem;
}

.list-item h4 a {
    color: var(--primary-color);
}

.list-item h4 a:hover {
    color: var(--accent-color);
}

.list-item .venue {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Honors Grid */
.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.honor-card {
    padding: 1.5rem;
    background: var(--background-alt);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.honor-card .year {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.honor-card h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.honor-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Blog */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: var(--background);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

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

.blog-card-content {
    padding: 1.5rem;
}

.blog-card .date {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.blog-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.blog-card h3 a {
    color: var(--primary-color);
}

.blog-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a:hover {
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .hero-image img {
        max-width: 280px;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .menu-toggle {
        display: flex;
    }

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

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

    .nav-links li {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .cv-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .cv-item .date {
        min-width: auto;
    }
}

/* Scroll to Top Button */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

/* Media Page Grid */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.media-card {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
}

.media-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.media-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.media-card-content {
    padding: 1.25rem;
}

.media-card-content .date {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.media-card-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.media-card-content h4 a {
    color: var(--primary-color);
    transition: var(--transition);
}

.media-card-content h4 a:hover {
    color: var(--accent-color);
}

.media-card-content .venue {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 500;
}

@media (max-width: 768px) {
    .media-grid {
        grid-template-columns: 1fr;
    }
}

/* Honors Year Boxes */
.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.year-box {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    transition: var(--transition);
}

.year-box:hover {
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.year-box h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.year-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.year-box li {
    font-size: 0.9rem;
    color: var(--text-color);
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
}

.year-box li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

@media (max-width: 768px) {
    .honors-grid {
        grid-template-columns: 1fr;
    }
}