:root {
    --primary: #FF6B35;
    --primary-light: #FF8C5A;
    --primary-dark: #E55A2B;
    --dark: #222222;
    --light: #FFFFFF;
    --gray: #F8F9FA;
    --text: #444444;
    --accent: #2A9D8F;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--text);
    line-height: 1.6;
    background-color: var(--light);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title h2 {
    font-size: 2.8rem;
    color: var(--dark);
    display: inline-block;
    font-weight: 700;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 5px;
    background: var(--primary);
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 5px;
}

/* Navbar */
/* =======================
    NEW CREATIVE NAVBAR
=========================== */

.glass-nav {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 92%;
    max-width: 1150px;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(15px);
    padding: 12px 25px;
    border-radius: 60px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    z-index: 1000;
    transition: all 0.3s ease;
}

.glass-nav.scrolled {
    background: rgba(255, 255, 255, 0.9);
    padding: 8px 22px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}

/* Wrapper inside nav */
.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo Bubble */
.nav-logo-bubble {
    background-image:url(techlogo.png); 
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: 0 7px 20px rgba(255,107,53,0.4);
    transition: transform 0.2s;
    background-position: center;
    background-size: contain;
    background-repeat: no-repeat;
}

.nav-logo-bubble:hover {
    transform: scale(1.07);
}

.nav-logo-img {
    width: 32px;
}

/* NAV LINKS */
.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    position: relative;
}

.nav-links a {
    font-weight: 600;
    font-size: 1.05rem;
    padding: 10px 18px;
    border-radius: 30px;
    position: relative;
    z-index: 2;
    transition: color 0.25s;
}

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

/* ACTIVE INDICATOR */
.nav-indicator {
    position: absolute;
    height: 40px;
    width: 110px;
    background: rgba(255, 107, 53, 0.2);
    border-radius: 30px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
    transition: 0.35s ease;
}

/* Ripple Hover */
.nav-links a:hover::before {
    content: "";
    position: absolute;
    width: 45px;
    height: 45px;
    background: rgba(255, 107, 53, 0.15);
    border-radius: 50%;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(1);
    transition: 0.25s;
}

/* Hamburger */
.hamburger {
    display: none;
    font-size: 1.8rem;
    background: none;
    border: none;
    color: var(--dark);
    cursor: pointer;
}

/* MOBILE MENU */
@media(max-width: 850px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 85px;
        right: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(255,255,255,0.95);
        padding: 25px 0;
        border-radius: 25px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    }

    .nav-links.active {
        display: flex;
        animation: fadeIn 0.3s ease forwards;
    }

    .nav-indicator {
        display: none;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(-12px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .hamburger {
        display: block;
    }
}


/* Hero Section */
#hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 100px;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

#hero-left {
    flex: 1;
    padding-right: 40px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.hero-title {
    font-size: 3.8rem;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.2;
    font-weight: 700;
}

.hero-title span {
    color: var(--primary);
    position: relative;
}

.hero-title span::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 8px;
    background: rgba(255, 107, 53, 0.2);
    bottom: 5px;
    left: 0;
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: var(--text);
    font-weight: 500;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 600px;
    color: var(--text);
}

.btn {
    display: inline-block;
    padding: 14px 35px;
    background: var(--primary);
    color: white;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid var(--primary);
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.3);
}

.btn:hover {
    background: transparent;
    color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    margin-left: 20px;
}

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

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

#hero-right {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image-container {
    position: relative;
    z-index: 2;
}

.hero-image {
    width: 400px;
    height: 400px;
    border-radius: 50%;
    object-fit: cover;
    border: 10px solid white;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.radiant-bg {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--primary-light) 0%, rgba(255, 107, 53, 0.3) 60%, transparent 80%);
    z-index: 1;
    animation: pulse 6s infinite ease-in-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.9;
    }
    100% {
        transform: scale(1);
        opacity: 0.7;
    }
}

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

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-category {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.skill-category:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.skill-category h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-category h3 i {
    color: var(--primary);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-item {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.skill-item:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 220px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    margin: 0 10px;
    font-size: 1.2rem;
    transition: transform 0.3s, background 0.3s;
}

.project-links a:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.project-info {
    padding: 25px;
}

.project-info h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.project-info p {
    margin-bottom: 15px;
    color: var(--text);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Research Section */
.research {
    background-color: var(--gray);
}

.research-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
    font-size: 1.2rem;
    color: var(--text);
}

.research-papers {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.paper-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    display: flex;
    gap: 25px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.paper-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.paper-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: rgba(255, 107, 53, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
}

.paper-content {
    flex: 1;
}

.paper-content h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.paper-meta {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.paper-abstract {
    margin-bottom: 20px;
    color: var(--text);
}

.paper-link {
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: gap 0.3s;
}

.paper-link:hover {
    gap: 12px;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.contact-info p {
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.contact-details {
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    font-size: 1.2rem;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    transition: transform 0.3s, background 0.3s;
    font-size: 1.2rem;
}

.social-links a:hover {
    transform: translateY(-5px);
    background: var(--primary-dark);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.contact-form input,
.contact-form textarea {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    font-family: 'Poppins', sans-serif;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

/* Footer */
/* ================================
   CREATIVE MODERN FOOTER
================================ */

.footer-section {
    background: linear-gradient(135deg, #1d1d1d 0%, #111111 100%);
    color: white;
    padding: 70px 0 35px;
    margin-top: 80px;
    border-radius: 40px 40px 0 0;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.25);
}

/* Footer Content Layout */
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 45px;
    flex-wrap: wrap;
}

/* Logo Block */
.footer-logo-block {
    max-width: 330px;
}

.footer-logo-circle {
    background: rgba(255, 107, 53, 0.15);
    width: 65px;
    height: 65px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px rgba(255, 107, 53, 0.4);
    margin-bottom: 18px;
    transition: transform 0.3s;
}

.footer-logo-circle:hover {
    transform: scale(1.05);
}

.footer-logo-img {
    width: 40px;
}

.footer-tagline {
    opacity: 0.85;
    font-size: 1.05rem;
    line-height: 1.6;
}

/* Navigation Links */
.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    font-weight: 500;
    font-size: 1.05rem;
    transition: color 0.3s, transform 0.25s;
    position: relative;
}

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

.footer-links a::after {
    content: "";
    position: absolute;
    width: 0%;
    height: 2.5px;
    background: var(--primary);
    bottom: -5px;
    left: 0;
    border-radius: 2px;
    transition: width 0.3s ease;
}

.footer-links a:hover::after {
    width: 100%;
}

/* Bottom Line */
.footer-bottom {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-bottom p {
    opacity: 0.75;
    font-size: 0.95rem;
}

/* Responsive */
@media(max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 25px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }
}


/* Responsive Design */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    #hero-left {
        padding-right: 0;
        margin-bottom: 50px;
    }
    
    .hero-description {
        margin: 0 auto 40px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-image {
        width: 320px;
        height: 320px;
    }
    
    .radiant-bg {
        width: 400px;
        height: 400px;
    }
    
    
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links li {
        margin: 10px 0;
        text-align: center;
    }
    
    .hamburger {
        display: block;
    }
    
    .section-title h2 {
        font-size: 2.2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .hero-image {
        width: 280px;
        height: 280px;
    }
    
    .radiant-bg {
        width: 350px;
        height: 350px;
    }
    
    .paper-card {
        flex-direction: column;
        text-align: center;
    }
    
    .paper-icon {
        align-self: center;
    }
}

@media (max-width: 576px) {
    section {
        padding: 80px 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-image {
        width: 240px;
        height: 240px;
    }
    
    .radiant-bg {
        width: 300px;
        height: 300px;
    }
    
    .btn {
        padding: 12px 25px;
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-outline {
        margin-left: 0;
        margin-top: 10px;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 1.8rem;
    }
}