:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --tertiary-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-gradient: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 50%, #16213e 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-accent: #667eea;
    --shadow-glow: 0 20px 40px rgba(102, 126, 234, 0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--dark-gradient);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background: var(--dark-gradient);
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.6;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(102, 126, 234, 0.8);
    border-radius: 50%;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(100vh) translateX(0px); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(12, 12, 12, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

nav.scrolled {
    padding: 15px 0;
    background: rgba(12, 12, 12, 0.98);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-item {
    position: relative;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav-item:hover, .nav-item.active {
    color: var(--text-primary);
    transform: translateY(-2px);
}

.nav-item:hover::after, .nav-item.active::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 40px;
}

.hero-content {
    max-width: 1400px;
    width: 90%;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 80px;
    align-items: center;
}

.hero-text {
    z-index: 2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-accent);
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 30px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -2px;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
    max-width: 600px;
}

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

.btn {
    padding: 16px 32px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px rgba(102, 126, 234, 0.4);
}

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

.btn-outline:hover {
    background: var(--glass-bg);
    border-color: var(--text-accent);
    transform: translateY(-3px);
}

.hero-image {
    position: relative;
    text-align: center;
}

.profile-container {
    position: relative;
    display: inline-block;
}

.profile-photo {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid transparent;
    background: var(--primary-gradient);
    padding: 4px;
    transition: var(--transition);
    filter: brightness(1.1) contrast(1.1);
}

.profile-photo:hover {
    transform: scale(1.05) rotate(5deg);
    box-shadow: 0 30px 60px rgba(102, 126, 234, 0.3);
}

.floating-icons {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.floating-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-accent);
    animation: floatAround 6s ease-in-out infinite;
}

.floating-icon:nth-child(1){ 
    top: 10%; 
    right: 0%; 
    animation-delay: 0s; 
}

.floating-icon:nth-child(2){ 
    top: 60%; 
    right: -5%; 
    animation-delay: 2s;
}

.floating-icon:nth-child(3){ 
    bottom: 10%; 
    left: 5%; 
    animation-delay: 4s; 
}

@keyframes floatAround {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* Page Sections */
.page-section {
    min-height: 100vh;
    padding: 120px 40px;
    max-width: 1400px;
    margin: 0 auto;
    display: none;
}

.page-section.active {
    display: block;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    gap: 30px;
}

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.card:hover::before {
    transform: scaleX(1);
}

/* Education  */
.education-grid {
    grid-template-columns: 1fr;
}

.education-card {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 30px;
    align-items: center;
}

.education-year {
    font-size: 2rem;
    font-weight: 900;
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

.education-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.education-degree {
    color: var(--text-accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.education-score {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 600;
}

/* Projects  */
.projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.project-card {
    position: relative;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.3;
}

.project-duration {
    color: var(--text-accent);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 25px;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.tech-tag {
    background: var(--tertiary-gradient);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.project-link {
    color: var(--text-accent);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Certificates  */
.certificates-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.certificate-card {
    text-align: center;
}

.certificate-icon {
    width: 80px;
    height: 80px;
    background: var(--secondary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: white;
}

.certificate-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.certificate-issuer {
    color: var(--text-accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.certificate-date {
    color: var(--text-secondary);
}

/* Skills  */
.skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.skill-category {
    text-align: center;
}

.skill-icon {
    width: 100px;
    height: 100px;
    background: var(--tertiary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2.5rem;
    color: white;
}

.skill-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.skill-tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--primary-gradient);
    border-color: transparent;
    transform: translateY(-2px);
}

/* Contact  */
.contact-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    text-align: center;
    cursor: pointer;
}

.contact-icon {
    width: 100px;
    height: 100px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2.5rem;
    color: white;
    transition: var(--transition);
}

.contact-card:hover .contact-icon {
    transform: scale(1.1) rotate(10deg);
}

.contact-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.contact-info {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    font-size: 3rem;
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

.loader-bar {
    width: 200px;
    height: 4px;
    background: rgba(102, 126, 234, 0.2);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.loader-progress {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 2px;
    animation: loading 3s ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes loading {
    0% { width: 0%; }
    100% { width: 100%; }
}

@media (max-width: 1200px) {
    .nav-container { padding: 0 30px; }
    .hero-section { padding: 0 30px; }
    .page-section { padding: 120px 30px; }
}

@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(12, 12, 12, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 40px 0;
        gap: 20px;
        transform: translateY(-100%);
        visibility: hidden;
        opacity: 0;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        visibility: visible;
        opacity: 1;
    }

    .mobile-toggle { display: block; }
    .hero-content {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .hero-text { order: 2; }
    .hero-image { order: 1; }
    .profile-photo { width: 280px; height: 280px; }
}

@media (max-width: 768px) {
    .nav-container{ 
        padding: 0 20px; 
    }
    .hero-section{ 
        padding: 0 20px;
    }
    .page-section{ 
        padding: 100px 20px; 
    }
    
    .projects-grid{ 
        grid-template-columns: 1fr; 
    }
    .education-card{ 
        grid-template-columns: 1fr; 
        text-align: center; 
    }
    .cards-grid{ 
        gap: 20px; 
    }
    .card{ 
        padding: 30px; 
    }
    
    .cta-buttons{ 
        justify-content: center; 
    }
    .floating-icons{ display: none; 
    }
}
@media (max-width: 600px) {
    .nav-container{ 
        padding: 0 15px; 
    }
    .hero-section{ 
        padding: 0 15px; 
    }
    .page-section{ 
        padding: 80px 15px; 
    }
    .hero-description{ 
        font-size: 1.2rem; 
    }
    .btn{ 
        padding: 14px 28px; 
        font-size: 0.95rem; 
    }
    .cards-grid{ 
        gap: 15px; 
    }
    .card{ 
        padding: 25px; 
    }
}

@media (max-width: 480px){
    .profile-photo{ 
        width: 240px; 
        height: 240px; 
    }
    .hero-description{ 
        font-size: 1.1rem; 
    }
    .btn{ 
        padding: 14px 24px; 
        font-size: 0.9rem; 
    }
    .card{ 
        padding: 20px; 
    }
}
::-webkit-scrollbar { 
    width: 8px; 
}
::-webkit-scrollbar-track{ 
    background: rgba(255, 255, 255, 0.1); 
}
::-webkit-scrollbar-thumb{ 
    background: var(--primary-gradient); 
    border-radius: 4px; 
}
::-webkit-scrollbar-thumb:hover { 
    background: var(--secondary-gradient); 
}