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

:root {
    --primary-purple: #7c3aed;
    --primary-blue: #2563eb;
    --dark-blue: #1e40af;
    --light-purple: #8b5cf6;
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    background: var(--bg-gradient);
    line-height: 1.6;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.2;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 100px 0;
    scroll-margin-top: 80px; /* For smooth scrolling with fixed nav */
}

.highlight {
    color: var(--primary-purple);
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: rgba(124, 58, 237, 0.2);
    z-index: -1;
    border-radius: 4px;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--light-purple), var(--dark-blue));
}

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

.btn-secondary:hover {
    background-color: rgba(124, 58, 237, 0.1);
    transform: translateY(-3px);
}

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

.btn-outline:hover {
    background-color: rgba(37, 99, 235, 0.1);
    transform: translateY(-3px);
}

.btn-contact {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
    color: white;
    padding: 10px 24px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

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

/* ========== NAVIGATION ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: var(--radius-md);
}

.nav-menu a:hover {
    color: var(--primary-purple);
    background-color: rgba(124, 58, 237, 0.1);
}

.nav-menu a.active {
    color: var(--primary-purple);
    background-color: rgba(124, 58, 237, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========== HERO SECTION ========== */
.hero {
    padding-top: 140px;
    padding-bottom: 100px;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--primary-blue);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
    font-weight: 600;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    padding: 20px 0;
}

.stat h3 {
    font-size: 2.5rem;
    color: var(--primary-purple);
    margin-bottom: 5px;
}

.stat p {
    color: var(--text-light);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
}

.image-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.image-border {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
    border: 3px solid var(--primary-purple);
    z-index: 1;
}

.floating-badge {
    position: absolute;
    bottom: 30px;
    left: -20px;
    background: white;
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 3;
}

.floating-badge i {
    color: var(--primary-purple);
    font-size: 1.2rem;
}

.floating-badge span {
    font-weight: 600;
    color: var(--text-primary);
}

/* ========== SECTION TITLES ========== */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-purple), var(--primary-blue));
    border-radius: 2px;
}

.section-description {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 50px;
}

.section-subtitle {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-primary);
}

/* ========== ABOUT SECTION ========== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 60px;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-text p {
    margin-bottom: 20px;
}

.about-highlight {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(37, 99, 235, 0.1));
    padding: 25px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-purple);
    margin: 30px 0;
}

.about-highlight p {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.skill-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-purple);
}

.skill-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(37, 99, 235, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.skill-icon i {
    font-size: 1.8rem;
    color: var(--primary-purple);
}

.skill-card h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

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

/* ========== JOURNEY SECTION ========== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-purple), var(--primary-blue));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 60px;
    width: 50%;
    padding: 0 40px;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-md);
    position: relative;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-purple);
}

.timeline-item:nth-child(odd) .timeline-content::after {
    content: '';
    position: absolute;
    right: -10px;
    top: 30px;
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-left: 10px solid var(--card-bg);
}

.timeline-item:nth-child(even) .timeline-content::after {
    content: '';
    position: absolute;
    left: -10px;
    top: 30px;
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-right: 10px solid var(--card-bg);
}

.timeline-marker {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
    border: 4px solid white;
    box-shadow: 0 0 0 4px var(--primary-purple);
    top: 30px;
    z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-marker {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-marker {
    left: -10px;
}

.timeline-date {
    display: inline-block;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(37, 99, 235, 0.1));
    color: var(--primary-purple);
    padding: 5px 15px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.timeline-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.timeline-org {
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: 15px;
    display: block;
}

.timeline-description {
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== RESEARCH SECTION ========== */
.research-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    max-width: 800px;
    margin: 0 auto;
}

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

.research-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    color: var(--primary-blue);
    padding: 8px 20px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.research-badge i {
    font-size: 1rem;
}

.research-title {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.research-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    color: var(--text-light);
    font-size: 0.95rem;
    flex-wrap: wrap;
}

.research-meta i {
    color: var(--primary-purple);
    margin-right: 5px;
}

.research-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.research-objectives {
    margin: 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.8), rgba(241, 245, 249, 0.8));
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-purple);
}

.research-objectives h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.research-objectives ul {
    list-style: none;
    padding-left: 0;
}

.research-objectives li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
    color: var(--text-secondary);
}

.research-objectives li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: bold;
}

.doi-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    margin-top: 20px;
    transition: var(--transition);
}

.doi-link:hover {
    color: var(--primary-purple);
    gap: 15px;
}

/* ========== CONTACT SECTION ========== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.contact-info-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.contact-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(37, 99, 235, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.5rem;
    color: var(--primary-purple);
}

.contact-details h4 {
    font-size: 1.3rem;
    margin-bottom: 5px;
    color: var(--text-primary);
}

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

.contact-details a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition);
}

.contact-details a:hover {
    color: var(--primary-purple);
}

.contact-note {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 5px;
}

.contact-actions-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-actions-card h4 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    cursor: pointer;
    border: none;
    outline: none;
}

.action-btn.whatsapp {
    background-color: #25D366;
    color: white;
}

.action-btn.whatsapp:hover {
    background-color: #128C7E;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(37, 211, 102, 0.2);
}

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

.action-btn.call:hover {
    background-color: var(--dark-blue);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.action-btn.email:hover {
    background-color: #6d28d9;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.social-contact h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.social-contact .social-links {
    display: flex;
    gap: 15px;
}

.social-contact .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: rgba(124, 58, 237, 0.1);
    border-radius: 50%;
    color: var(--primary-purple);
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.2rem;
}

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

/* ========== FOOTER ========== */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-info .logo {
    color: white;
    font-size: 1.8rem;
    margin-bottom: 15px;
    display: inline-block;
}

.footer-info p {
    color: #cbd5e1;
    margin-bottom: 20px;
    max-width: 300px;
}

.footer .social-links {
    display: flex;
    gap: 15px;
}

.footer .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.footer .social-links a:hover {
    background-color: var(--primary-purple);
    transform: translateY(-3px);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-links h4, .footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after, .footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--primary-purple);
}

.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.footer-contact p {
    color: #cbd5e1;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
    font-size: 0.9rem;
}