/* ==================== 
   Global Styles 
   ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e40af;
    --secondary-color: #3b82f6;
    --accent-color: #60a5fa;
    --dark-bg: #1f2937;
    --light-bg: #f9fafb;
    --text-dark: #111827;
    --text-light: #6b7280;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 
   Navigation 
   ==================== */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-color);
}

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

.logo-section {
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo-placeholder,
.iit-logo-placeholder {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
    padding: 10px 15px;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
}

.iit-logo-placeholder {
    font-size: 0.9rem;
    background-color: var(--primary-color);
    color: var(--white);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 8px 12px;
    border-radius: 4px;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background-color: rgba(30, 64, 175, 0.1);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: 0.3s;
}

/* ==================== 
   Hero Section 
   ==================== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-style: italic;
    opacity: 0.95;
    max-width: 800px;
    margin: 0 auto;
}

/* ==================== 
   Featured Section 
   ==================== */
.featured-section {
    padding: 3rem 0;
    background-color: var(--light-bg);
}

.featured-image-placeholder {
    background-color: var(--border-color);
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    border: 3px dashed var(--text-light);
}

.featured-image-placeholder p {
    font-size: 1.5rem;
    color: var(--text-light);
    font-weight: 500;
}

.featured-image-placeholder small {
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* ==================== 
   Section Headers 
   ==================== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.underline {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    margin: 0 auto;
    border-radius: 2px;
}

/* ==================== 
   About Section 
   ==================== */
.about-section {
    padding: 4rem 0;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* ==================== 
   Research Areas 
   ==================== */
.research-areas {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

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

.research-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.research-card h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.research-card p {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
}

/* ==================== 
   PI Section 
   ==================== */
.pi-section {
    padding: 4rem 0;
}

.pi-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: start;
}

.pi-image-placeholder {
    background-color: var(--border-color);
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    border: 3px dashed var(--text-light);
}

.pi-image-placeholder p {
    color: var(--text-light);
    font-size: 1.2rem;
}

.pi-name {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.pi-title {
    font-size: 1.2rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.pi-department {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.pi-bio p {
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== 
   Buttons 
   ==================== */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

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

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* ==================== 
   Team Preview 
   ==================== */
.team-preview {
    padding: 4rem 0;
    background-color: var(--light-bg);
    text-align: center;
}

.team-category {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.team-description {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== 
   Footer 
   ==================== */
.footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 3rem 0 1rem;
}

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

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section p,
.footer-section ul li {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
}

/* ==================== 
   Team Page Styles 
   ==================== */
.team-section {
    padding: 4rem 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.team-member {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.member-image-placeholder {
    background-color: var(--border-color);
    height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 3px solid var(--primary-color);
}

.member-image-placeholder p {
    color: var(--text-light);
}

.member-info {
    padding: 1.5rem;
}

.member-info h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.member-info .role {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.member-info p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 
   Publications Page Styles 
   ==================== */
.publications-section {
    padding: 4rem 0;
}

.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    background-color: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.publication-item h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    line-height: 1.4;
}

.publication-authors {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.publication-journal {
    color: var(--text-dark);
    font-weight: 500;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.publication-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.publication-meta span {
    background-color: var(--light-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ==================== 
   News Page Styles 
   ==================== */
.news-section {
    padding: 4rem 0;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.news-card {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-image-placeholder {
    background-color: var(--border-color);
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 3px solid var(--primary-color);
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-card h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.news-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ==================== 
   Facilities Page Styles 
   ==================== */
.facilities-section {
    padding: 4rem 0;
}

.facility-item {
    background-color: var(--white);
    padding: 2.5rem;
    margin-bottom: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.facility-item h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.facility-description {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.facility-specs {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.facility-specs h4 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.facility-specs ul {
    list-style-position: inside;
    color: var(--text-light);
}

.facility-specs ul li {
    margin-bottom: 0.5rem;
}

/* ==================== 
   Contact Page Styles 
   ==================== */
.contact-section {
    padding: 4rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.contact-info {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 12px;
}

.contact-info h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.contact-item {
    margin-bottom: 1.5rem;
}

.contact-item h4 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--text-light);
    line-height: 1.6;
}

.contact-form {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--text-dark);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ==================== 
   Responsive Design 
   ==================== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

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

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .pi-content {
        grid-template-columns: 1fr;
    }

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

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

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

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

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

@media (max-width: 480px) {
    .logo-section {
        flex-direction: column;
        gap: 10px;
    }

    .logo-placeholder,
    .iit-logo-placeholder {
        font-size: 0.9rem;
        padding: 8px 12px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }
}