/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #0a0a0a;
    overflow-x: hidden;
}

/* CSS Custom Properties */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-tertiary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --border-color: #333333;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.2);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.3);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Loading Screen */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 60px;
    height: 60px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    position: relative;
}

.profile-avatar {
    width: 200px;
    height: 200px;
    overflow: hidden;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

.project-image {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 10px;
    margin: 12px 0 20px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease;
}

.project-image:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.profile-avatar img.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    top: 10px;
}

.loader-inner {
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: var(--shadow-medium);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo span {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 50px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
    z-index: -1;
}

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

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

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

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-card {
    position: relative;
    width: 300px;
    height: 300px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-heavy);
    animation: float 6s ease-in-out infinite;
}

.profile-avatar {
    width: 280px;
    height: 280px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 80px;
    color: var(--text-secondary);
}

.floating-elements {
    position: absolute;
    width: 400px;
    height: 400px;
}

.floating-element {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    box-shadow: var(--shadow-medium);
    animation: orbit 10s linear infinite;
    animation-delay: var(--delay);
}

.floating-element:nth-child(1) {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    color: #f7df1e;
}

.floating-element:nth-child(2) {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    color: #3776ab;
}

.floating-element:nth-child(3) {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    color: #339933;
}

.floating-element:nth-child(4) {
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    color: #61dafb;
}

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

@keyframes orbit {
    0% { transform: rotate(0deg) translateX(170px) rotate(0deg); }
    100% { transform: rotate(360deg) translateX(170px) rotate(-360deg); }
}

/* Section Styles */
section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

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

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.info-card {
    background: var(--bg-tertiary);
    padding: 40px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.info-card h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 20px;
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--primary-color);
    width: 20px;
}

.education h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.education-timeline {
    position: relative;
}

.education-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 40px;
}

.timeline-marker {
    position: absolute;
    left: 10px;
    top: 0;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 4px solid var(--bg-secondary);
}

.timeline-content h4 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.timeline-content .institution {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 5px;
}

.timeline-content .field,
.timeline-content .grade,
.timeline-content .duration {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 3px;
}

/* ===================== */
/* Experience Section    */
/* ===================== */
.experience {
    background: var(--bg-primary);
}

.experience-timeline {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.experience-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 36px 40px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px 0 0 4px;
}

.experience-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
    border-color: rgba(102, 126, 234, 0.4);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 28px;
    gap: 20px;
    flex-wrap: wrap;
}

.exp-company-info {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.exp-company-icon {
    width: 52px;
    height: 52px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 22px;
    color: white;
    flex-shrink: 0;
}

.exp-role {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.exp-company {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 4px;
}

.exp-location {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.exp-location i {
    font-size: 0.75rem;
}

.exp-duration-badge {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 16px;
    white-space: nowrap;
    flex-shrink: 0;
}

.exp-duration-badge span {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.exp-bullets {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 24px;
}

.exp-bullet {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.bullet-dot {
    width: 7px;
    height: 7px;
    background: var(--primary-color);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 8px;
}

.exp-bullet p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

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

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.project-card:hover::before {
    opacity: 0.05;
}

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

.project-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    color: white;
}

.project-links {
    display: flex;
    gap: 10px;
}

.project-link {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.project-link:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.project-title {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.npm-badge {
    font-size: 0.7rem;
    font-weight: 600;
    background: linear-gradient(135deg, #cb3837, #ef5350);
    color: white;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.3px;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.project-description code {
    background: var(--bg-tertiary);
    color: var(--accent-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: 'Courier New', monospace;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.tech-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

.project-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Skills Section */
.skills {
    background: var(--bg-secondary);
}

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

.skill-category {
    background: var(--bg-tertiary);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.category-title {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-item {
    background: var(--bg-primary);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-item:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.achievement-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-secondary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.achievement-card:hover::before {
    opacity: 0.05;
}

.achievement-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-secondary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 32px;
    color: white;
    margin: 0 auto 20px;
}

.achievement-content h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.achievement-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.achievement-content p strong {
    color: var(--text-primary);
}

.achievement-content p code {
    background: var(--bg-tertiary);
    color: var(--accent-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.82em;
    font-family: 'Courier New', monospace;
}

.achievement-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.achievement-link:hover {
    color: var(--accent-color);
}

/* Contact Section */
.contact {
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-card {
    background: var(--bg-tertiary);
    padding: 40px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    color: white;
}

.contact-details h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.contact-details a,
.contact-details span {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    text-align: center;
}

.social-links h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid var(--border-color);
}

.social-icon.linkedin { color: #0077b5; border-color: #0077b5; }
.social-icon.github { color: #aaa; border-color: #555; }
.social-icon.instagram { color: #e1306c; border-color: #e1306c; }
.social-icon.leetcode { color: #ffa116; border-color: #ffa116; }
.social-icon.email { color: #ea4335; border-color: #ea4335; }

.social-icon:hover {
    background: currentColor;
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 20px 0;
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.active { left: 0; }
    .nav-item { margin: 10px 0; }

    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-title { font-size: 2.5rem; }

    .about-content { grid-template-columns: 1fr; gap: 40px; }
    .contact-content { grid-template-columns: 1fr; gap: 40px; }
    .hero-buttons { justify-content: center; }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr; }
    .achievements-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

    .profile-card { width: 250px; height: 250px; }
    .profile-avatar { width: 230px; height: 230px; font-size: 60px; }
    .floating-elements { width: 300px; height: 300px; }
    .floating-element { width: 50px; height: 50px; font-size: 20px; }

    .experience-card { padding: 24px 20px; }
    .exp-header { flex-direction: column; gap: 14px; }
    .exp-duration-badge { align-self: flex-start; }
    .exp-company-info { gap: 12px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .section-title { font-size: 2rem; }
    .container { padding: 0 15px; }
    .btn { padding: 10px 20px; font-size: 0.9rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
}

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}