/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1100;
    margin-left: 1rem;
}

.nav-toggle .bar {
    width: 28px;
    height: 3px;
    background: var(--primary-color);
    margin: 4px 0;
    border-radius: 2px;
    transition: var(--transition);
}

nav ul li {
    margin: 1.2rem 0;
    width: 100%;
}

nav ul li a {
    width: 100%;
    display: block;
    padding: 0.5rem 0;
    font-size: 1.1rem;
}

.nav-toggle.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Base styles and resets */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Roboto:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #4cc9f0;
    --dark-color: #2b2d42;
    --light-color: #f8f9fa;
    --gray-color: #8d99ae;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --transition: all 0.3s ease;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

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

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

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

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

/* Header and Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 0;
    background-color: transparent;
    z-index: 1000;
    transition: var(--transition);
}

header.sticky {
    background-color: white;
    box-shadow: var(--shadow);
    padding: 0.8rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

header.sticky .logo {
    background: transparent;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

nav ul li a:hover::after,
nav ul li a.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.9), rgba(58, 12, 163, 0.9)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97') no-repeat center center/cover;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 1rem;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

.hero h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

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

/* About Section */
.about {
    padding: 6rem 0;
}

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

.about-image {
    position: relative;
}


.placeholder-image {
    background-color: #e9ecef;
    border-radius: 50%;
    width: 300px;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.placeholder-image .profile-pic {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-text p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Education Section */
.education {
    padding: 6rem 0;
    background-color: #f8f9fa;
}

.education-item {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.education-info {
    margin-bottom: 2rem;
}

.education-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.institution {
    font-weight: 500;
    color: var(--gray-color);
    margin-bottom: 0.5rem;
}

.duration,
.grade {
    color: var(--gray-color);
}

.relevant-courses h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

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

.course-category h5 {
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.course-category ul li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.course-category ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Skills Section */
.skills {
    padding: 6rem 0;
}

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

.skill-category {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-10px);
}

.skill-category h3 {
    text-align: center;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    color: var(--secondary-color);
}

.skill-category ul li {
    margin-bottom: 1rem;
    position: relative;
    padding-left: 1.5rem;
}

.skill-category ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

/* Research Interests Section */
.interests {
    padding: 6rem 0;
    background-color: #f8f9fa;
}

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

.interest-area {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.interest-area:hover {
    transform: translateY(-10px);
}

.interest-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.interest-icon i {
    font-size: 2rem;
}

.interest-area h3 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.interest-area p {
    margin-bottom: 1rem;
}

.interest-area ul {
    margin-top: 1rem;
}

.interest-area ul li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.interest-area ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* Projects Section */
.projects {
    padding: 6rem 0;
}

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

.project-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

.placeholder-project {
    width: 100%;
    height: 100%;
    background-color: #e9ecef;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-project i {
    font-size: 4rem;
    color: var(--gray-color);
}

.project-details {
    padding: 1.5rem;
}

.project-details h3 {
    margin-bottom: 0.5rem;
}

.tech-stack {
    color: var(--primary-color);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.project-link {
    font-size: 0.9rem;
}

.project-link i {
    margin-right: 0.3rem;
}

/* Contact Section */
.contact {
    padding: 6rem 0;
    background-color: #f8f9fa;
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

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

.social-link:hover {
    background: var(--secondary-color);
    transform: translateY(-5px);
}

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

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

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

/* Footer */
footer {
    background: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Media Queries for Responsiveness */
@media (max-width: 992px) {

    .nav-toggle {
        display: flex;
    }

    nav ul {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100vw;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 1.5rem 2rem;
        box-shadow: var(--shadow);
        margin-top: 0;
        display: none;
        z-index: 1001;
    }

    nav ul.open {
        display: flex;
    }

    nav ul li {
        margin: 1rem 0;
    }

    .nav-container {
        flex-direction: row;
        position: relative;
    }

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

    .about-image {
        margin-bottom: 2rem;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    nav ul {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100vw;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 1.5rem 2rem;
        box-shadow: var(--shadow);
        margin-top: 0;
        display: none;
        z-index: 1001;
    }

    nav ul.open {
        display: flex;
    }

    nav ul li {
        margin: 1rem 0;
    }

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

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    nav ul li {
        margin: 0.5rem;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero h2 {
        font-size: 1.3rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .contact-info {
        order: 2;
    }

    .contact-form {
        order: 1;
    }
}

@media (max-width: 576px) {
    .section-title {
        font-size: 1.8rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero h2 {
        font-size: 1.1rem;
    }

    .placeholder-image {
        width: 250px;
        height: 250px;
    }
}