:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --primary-light: #6c8aff;
    --secondary-color: #7209b7;
    --secondary-dark: #5a0892;
    --accent-color: #4cc9f0;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --text-color: #1e293b;
    --text-light: #64748b;
    --card-bg: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.95);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.dark-mode {
    --primary-color: #6c8aff;
    --primary-dark: #5a75e6;
    --primary-light: #8ba3ff;
    --secondary-color: #9d4edd;
    --secondary-dark: #7b2cbf;
    --accent-color: #56cfe1;
    --bg-color: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --text-color: #f8f9fa;
    --text-light: #adb5bd;
    --card-bg: #1a1a1a;
    --header-bg: rgba(10, 10, 10, 0.95);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.35);
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--header-bg);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: -0.5px;
}

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

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    font-size: 1rem;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 3px;
    bottom: -8px;
    left: 0;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
    border-radius: 2px;
}

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

.theme-toggle {
    background: rgba(67, 97, 238, 0.1);
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text-color);
    margin-left: 20px;
    transition: var(--transition);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--primary-color);
    background: rgba(67, 97, 238, 0.2);
    transform: rotate(15deg);
}

.mobile-menu {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: 10px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Hero Section */
.hero {
    padding: 160px 0 100px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    top: 10%;
    right: 10%;
    opacity: 0.1;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--secondary-color) 0%, transparent 70%);
    bottom: 10%;
    left: 5%;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 50px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    animation: fadeInUp 1s ease-out;
}

.hero-image {
    flex: 1;
    text-align: center;
    animation: fadeInRight 1s ease-out;
}

.hero-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
    border: 4px solid var(--card-bg);
}

.hero-image img:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-xl), 0 0 0 8px rgba(67, 97, 238, 0.1);
}

.hero h1 {
    font-size: 3.8rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 35px;
    color: var(--text-light);
    max-width: 600px;
    font-weight: 500;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Section Styling */
section {
    padding: 120px 0;
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: 70px;
    animation: fadeInUp 0.8s ease-out;
}

.section-title h2 {
    font-size: 2.8rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.section-title p {
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.2rem;
    font-weight: 500;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 35px;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }

.project-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
}

.project-img {
    height: 220px;
    overflow: hidden;
    position: relative;
}

.project-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.1) 100%);
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-img::after {
    opacity: 1;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    transition: var(--transition);
}

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

.project-content {
    padding: 28px;
}

.project-content h3 {
    margin-bottom: 12px;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.project-content p {
    margin-bottom: 18px;
    color: var(--text-light);
    line-height: 1.7;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 22px;
}

.tech-tag {
    background-color: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
    padding: 7px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.tech-tag:hover {
    background-color: rgba(67, 97, 238, 0.2);
    transform: translateY(-2px);
}

.project-buttons {
    display: flex;
    gap: 14px;
}

.project-buttons .btn {
    flex: 1;
    padding: 12px 18px;
    font-size: 0.95rem;
}

/* Interests Section */
.interests-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 35px;
}

.interest-card {
    background-color: var(--card-bg);
    padding: 35px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.interest-card:nth-child(1) { animation-delay: 0.1s; }
.interest-card:nth-child(2) { animation-delay: 0.2s; }
.interest-card:nth-child(3) { animation-delay: 0.3s; }
.interest-card:nth-child(4) { animation-delay: 0.4s; }

.interest-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.interest-icon {
    font-size: 2.8rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    width: 90px;
    height: 90px;
    background: rgba(67, 97, 238, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    transition: var(--transition);
}

.interest-card:hover .interest-icon {
    transform: scale(1.1) rotate(5deg);
    background: rgba(67, 97, 238, 0.15);
}

.interest-card h3 {
    margin-bottom: 12px;
    font-size: 1.4rem;
    font-weight: 700;
}

.interest-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Experience Section */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    border-radius: 10px;
}

.timeline-item {
    padding: 10px 45px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }

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

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

.timeline-content {
    padding: 28px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

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

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 5px;
    font-size: 1.4rem;
    font-weight: 700;
}

.timeline-content h4 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.timeline-content .duration {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 15px;
    display: block;
    font-size: 0.95rem;
}

.timeline-content ul {
    padding-left: 20px;
}

.timeline-content li {
    margin-bottom: 8px;
    color: var(--text-light);
    position: relative;
}

.timeline-content li::before {
    content: '▹';
    color: var(--primary-color);
    position: absolute;
    left: -15px;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    background-color: var(--bg-color);
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    top: 20px;
    z-index: 1;
    transition: var(--transition);
}

.timeline-item:hover::after {
    transform: scale(1.3);
    background-color: var(--primary-color);
}

.timeline-item:nth-child(odd)::after {
    right: -11px;
}

.timeline-item:nth-child(even)::after {
    left: -11px;
}

/* Education Section */
.education-container {
    max-width: 850px;
    margin: 0 auto;
}

.education-item {
    background-color: var(--card-bg);
    padding: 35px;
    border-radius: var(--border-radius);
    margin-bottom: 35px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.education-item:nth-child(1) { animation-delay: 0.1s; }
.education-item:nth-child(2) { animation-delay: 0.2s; }

.education-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.education-item h3 {
    color: var(--primary-color);
    margin-bottom: 5px;
    font-size: 1.5rem;
    font-weight: 700;
}

.education-item h4 {
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.education-item .duration {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 15px;
    display: block;
    font-size: 1rem;
}

.education-item p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 25px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.contact-item:nth-child(1) { animation-delay: 0.1s; }
.contact-item:nth-child(2) { animation-delay: 0.2s; }
.contact-item:nth-child(3) { animation-delay: 0.3s; }

.contact-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 1.6rem;
    color: var(--primary-color);
    width: 65px;
    height: 65px;
    background-color: rgba(67, 97, 238, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    transform: scale(1.1);
    background-color: rgba(67, 97, 238, 0.15);
}

.contact-text h3 {
    margin-bottom: 5px;
    font-size: 1.3rem;
    font-weight: 700;
}

.contact-text a, .contact-text p {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

.contact-form {
    background-color: var(--card-bg);
    padding: 35px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.05);
    animation: fadeInUp 0.8s ease-out;
    animation-delay: 0.4s;
    animation-fill-mode: both;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 16px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    font-size: 1rem;
    font-weight: 500;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

textarea.form-control {
    min-height: 160px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    padding: 60px 0 25px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.copyright {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-light);
    font-weight: 500;
}

.copyright p:first-child {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 1100px) {
    .hero h1 {
        font-size: 3.2rem;
    }
}

@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }
    
    .hero-content {
        margin-bottom: 0;
    }
    
    .hero h1 {
        font-size: 3rem;
    }
    
    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 75px;
        padding-right: 25px;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-item::after {
        left: 21px;
    }
    
    .timeline-item:nth-child(odd)::after,
    .timeline-item:nth-child(even)::after {
        left: 21px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--header-bg);
        flex-direction: column;
        padding: 25px;
        box-shadow: var(--shadow-lg);
        backdrop-filter: blur(16px);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links li {
        margin: 12px 0;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.15rem;
    }
    
    .section-title h2 {
        font-size: 2.3rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .project-buttons {
        flex-direction: column;
    }
    
    .interests-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .project-content, .education-item, .contact-form, .timeline-content {
        padding: 22px;
    }
}