:root {
    --primary: #4d8ee8;
    --primary-light: #6ba3ff;
    --primary-dark: #2a5cb5;
    --secondary: #7a4ced;
    --dark: #0f0f15;
    --darker: #08080d;
    --light: #f0f4f8;
    --gray: #252535;
    --light-gray: #3a3a4a;
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --section-padding: 6rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scrollbar-width: none;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark);
    color: var(--light);
    overflow-x: hidden;
    line-height: 1.6;
}

code, .mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Smooth page transitions */
.main-content {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Navigation */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--darker);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    z-index: 1000;
    border-right: 1px solid rgba(255,255,255,0.05);
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray);
}

.sidebar-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
    margin-right: 15px;
    box-shadow: 0 0 20px rgb(69, 102, 149);
}

.sidebar-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--light);
}

.sidebar-title {
    font-size: 0.8rem;
    color: var(--primary);
    opacity: 0.8;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-link {
    color: var(--light);
    text-decoration: none;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.nav-link i {
    font-size: 1.1rem;
    margin-right: 12px;
    width: 24px;
    text-align: center;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(77, 142, 232, 0.1);
    color: var(--primary-light);
}

.nav-link.active {
    font-weight: 500;
    box-shadow: inset 3px 0 0 var(--primary);
}

.mobile-menu-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(15, 15, 21, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--gray);
    color: var(--light);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 999;
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    background: var(--primary);
    color: var(--dark);
}

.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--darker);
    z-index: 1000;
    padding: 12px 0;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.3);
    border-top: 1px solid var(--gray);
}

.mobile-nav-container {
    display: flex;
    justify-content: space-around;
}

.mobile-nav a {
    color: var(--light);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.7rem;
    padding: 5px 10px;
    border-radius: 8px;
    transition: var(--transition);
}

.mobile-nav a i {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.mobile-nav a.active {
    color: var(--primary);
    background: rgba(77, 142, 232, 0.1);
}

/* Main Content */
.main-container {
    margin-left: 0;
    transition: margin-left 0.4s ease;
}

.main-container.sidebar-open {
    margin-left: 280px;
}

/* Home Page */
.home {
    min-height: 100vh;
    padding: 6rem 2rem;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.home::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    z-index: -1;
}

.home-content {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.profile-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.profile-img {
    width: 380px;
    height: 430px;
    border-radius: 20px;
    object-fit: cover;
    border: 8px solid var(--primary);
    box-shadow: 0 20px 50px rgba(77, 142, 232, 0.3);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.profile-img:hover {
    transform: scale(1.02);
    box-shadow: 0 25px 60px rgba(77, 142, 232, 0.4);
}

.intro-text {
    max-width: 500px;
    background: radial-gradient(circle, rgba(77,142,232,0.15) 0%, rgba(15,15,21,0) 70%); 
}

.greeting {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.greeting::before {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.name {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 0.5rem 0 1rem;
    line-height: 1.2;
}

.title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--light);
    opacity: 0.9;
}

.tagline {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: rgba(240, 244, 248, 0.8);
    max-width: 600px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gray);
    color: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--dark);
    transform: translateY(-3px);
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    margin-right: 1rem;
    margin-bottom: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(77, 142, 232, 0.3);
}

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

.btn-outline:hover {
    background: rgba(77, 142, 232, 0.1);
    transform: translateY(-3px);
}

.achievements {
    background-color: rgba(10, 10, 15, 0.7);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 15px;
    border: 1px solid var(--gray);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: translateY(50px);
    opacity: 0;
    animation: slideUp 0.8s 0.3s forwards;
}

@keyframes slideUp {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.achievements h2 {
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.achievements h2::before {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    margin: 1.5rem 0;
    padding: 1rem;
    border-radius: 8px;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.achievement-item:hover {
    background-color: rgba(77, 142, 232, 0.05);
    border-left-color: var(--primary);
    transform: translateX(5px);
}

.achievement-icon {
    font-size: 1.5rem;
    margin-right: 15px;
    color: var(--primary);
    margin-top: 3px;
}

.achievement-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--light);
}

.achievement-content p {
    color: rgba(240, 244, 248, 0.7);
    font-size: 0.95rem;
}

/* Projects Page */
.projects {
    padding: var(--section-padding) 5%;
    min-height: 100vh;
}

.section-header {
    max-width: 1200px;
    margin: 0 auto 3rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
    color: var(--light);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.section-subtitle {
    color: rgba(240, 244, 248, 0.7);
    max-width: 600px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    background-color: var(--gray);
    border: none;
    color: var(--light);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.filter-btn.active, .filter-btn:hover {
    background-color: var(--primary);
    color: var(--dark);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background-color: var(--darker);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
    border: 1px solid var(--gray);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(77, 142, 232, 0.2);
    border-color: var(--primary);
}

.project-img-container {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.project-card:hover .project-img {
    transform: scale(1.05);
}

.project-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--light);
}

.project-desc {
    color: rgba(240, 244, 248, 0.7);
    margin-bottom: 1.2rem;
    line-height: 1.6;
    font-size: 0.95rem;
    flex-grow: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.tech-item {
    background-color: rgba(77, 142, 232, 0.1);
    color: var(--primary);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
}

.project-links {
    display: flex;
    gap: 12px;
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    color: var(--light);
    text-decoration: none;
    padding: 0.5rem 1.2rem;
    border-radius: 6px;
    transition: var(--transition);
    font-size: 0.9rem;
}

.project-link i {
    margin-right: 8px;
}

.demo-link {
    background-color: var(--primary);
    color: var(--dark);
}

.demo-link:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.code-link {
    background-color: var(--gray);
}

.code-link:hover {
    background-color: var(--light-gray);
    transform: translateY(-2px);
}

/* Research Papers Page */
.research {
    padding: var(--section-padding) 5%;
    min-height: 100vh;
}

.papers-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.paper-card {
    background-color: var(--darker);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--gray);
    transition: var(--transition);
}

.paper-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(77, 142, 232, 0.1);
}

.paper-title {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--light);
}

.paper-authors {
    color: var(--primary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.paper-conference {
    display: inline-block;
    background: rgba(122, 76, 237, 0.1);
    color: var(--secondary);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.paper-abstract {
    margin-bottom: 1.5rem;
    line-height: 1.7;
    color: rgba(240, 244, 248, 0.8);
}

.paper-links {
    display: flex;
    gap: 12px;
}

.paper-link {
    display: inline-flex;
    align-items: center;
    color: var(--light);
    text-decoration: none;
    padding: 0.5rem 1.2rem;
    border-radius: 6px;
    transition: var(--transition);
    background-color: var(--gray);
    font-size: 0.9rem;
}

.paper-link:hover {
    background-color: var(--primary);
    color: var(--dark);
    transform: translateY(-2px);
}

/* Notes Page */
.notes {
    padding: var(--section-padding) 5%;
    min-height: 100vh;
}

.notes-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2rem;
}

.category-btn {
    padding: 0.6rem 1.2rem;
    background-color: var(--gray);
    border: none;
    color: var(--light);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.category-btn.active, .category-btn:hover {
    background-color: var(--primary);
    color: var(--dark);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.note-card {
    background-color: var(--darker);
    border-radius: 12px;
    padding: 1.8rem;
    border: 1px solid var(--gray);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.note-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(77, 142, 232, 0.1);
}

.note-category {
    display: inline-block;
    background: rgba(77, 142, 232, 0.1);
    color: var(--primary);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-bottom: 1rem;
    align-self: flex-start;
}

.note-title {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--light);
}

.note-desc {
    color: rgba(240, 244, 248, 0.7);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-size: 0.95rem;
    flex-grow: 1;
}

.note-link {
    display: inline-flex;
    align-items: center;
    color: var(--light);
    text-decoration: none;
    padding: 0.5rem 1.2rem;
    border-radius: 6px;
    transition: var(--transition);
    background-color: var(--gray);
    font-size: 0.9rem;
    align-self: flex-start;
}

.note-link:hover {
    background-color: var(--primary);
    color: var(--dark);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background-color: var(--darker);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--gray);
}

.footer-text {
    color: rgba(240, 244, 248, 0.6);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    :root {
        --section-padding: 5rem;
    }
    
    .home-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .profile-container {
        align-items: center;
        text-align: center;

    }
    
    .intro-text {
        margin: 0 auto;
        text-align: center;
    }
    
    .greeting {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .btn-container {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 992px) {
    :root {
        --section-padding: 4rem;
    }
    
    .name {
        font-size: 2.8rem;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .profile-img {
        width: 300px;
        height: 330px;
    }
}

@media (max-width: 768px) {

    .mobile-menu-btn{
        display: none;
    }

    .main-container.sidebar-open {
        margin-left: 0;
    }
    
    .mobile-nav {
        display: block;
    }
    
    .home {
        padding-bottom: 100px;
    }
    
    .projects, .research, .notes {
        padding-bottom: 100px;
    }
    
    .name {
        font-size: 2.4rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    :root {
        --section-padding: 3rem 1.5rem;
    }
    
    .profile-img {
        width: 240px;
        height: 280px;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .title {
        font-size: 1.3rem;
    }

    .mobile-menu-btn{
        display: none;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        margin-right: 0;
    }
    
    .paper-links, .project-links {
        flex-direction: column;
    }
}


/* Skills Section */
.skills-section {
    background-color: rgba(10, 10, 15, 0.7);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid var(--gray);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    margin: 3rem auto;
    max-width: 1200px;
    transform: translateY(50px);
    opacity: 0;
    animation: slideUp 0.8s 0.2s forwards;
}

.skills-section h2 {
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skills-section h2::before {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.skill-box {
    background-color: rgba(77, 142, 232, 0.1);
    color: var(--light);
    padding: 0.8rem 1.2rem;
    border-radius: 6px;
    font-size: 0.95rem;
    transition: var(--transition);
    border: 1px solid rgba(77, 142, 232, 0.3);
    white-space: nowrap;
}

.skill-box:hover {
    background-color: rgba(77, 142, 232, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(77, 142, 232, 0.2);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .skills-container {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1rem;
        -webkit-overflow-scrolling: touch;
    }
    
    .skill-box {
        flex: 0 0 auto;
    }
}






/* Welcome Animation  */
.welcome-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--darker);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.8s ease-out;
}

.welcome-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.welcome-container {
  display: flex;
  align-items: center;
}

.welcome-text {
  font-size: 100px;
  font-weight: 600;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
  text-shadow: 0 0px 20px rgba(91, 154, 244, 0.997);;
}

.cursor {
  font-size: 80px;
  color: var(--primary);
  animation: blink 0.7s infinite;
  margin-left: 4px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@media (max-width: 768px) {
  .welcome-text, .cursor {
    font-size: 1.8rem;
  }
}