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

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --border-color: #d2d2d7;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 64px;
    position: relative;
    background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 0;
}

.greeting {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 500;
}

.hero-title {
    font-size: clamp(48px, 8vw, 80px);
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(24px, 4vw, 32px);
    color: var(--text-primary);
    margin-bottom: 20px;
    font-weight: 600;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-secondary);
    border-radius: 20px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 0; top: 8px; }
    50% { opacity: 1; top: 16px; }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: #0051D5;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

.btn-small {
    padding: 10px 24px;
    font-size: 14px;
}

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

.section-title {
    font-size: clamp(36px, 5vw, 48px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

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

.about-text p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.stat {
    text-align: center;
}

.stat h3 {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.about-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.about-image:hover img {
    transform: scale(1.05);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: 60px;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 122, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-info {
    padding: 24px;
}

.project-info h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-info p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

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

.tag {
    display: inline-block;
    padding: 6px 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
}

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

.timeline {
    position: relative;
    max-width: 900px;
    margin: 60px auto;
    padding-left: 60px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: -51px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 0 4px var(--primary-color);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-hover);
}

.timeline-date {
    display: inline-block;
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

.timeline-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.timeline-content h4 {
    font-size: 16px;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.timeline-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.education-section {
    margin-top: 80px;
}

.education-section h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.education-item {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.education-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.education-item h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.education-item p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.edu-date {
    display: inline-block;
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 600;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.certification-item {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 28px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    color: white;
    text-align: center;
}

.certification-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.cert-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.certification-item h4 {
    font-size: 18px;
    font-weight: 600;
    color: white;
    margin-bottom: 8px;
}

.certification-item p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.skill-category h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--primary-color);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    margin-bottom: 20px;
}

.skill-name {
    display: block;
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 8px;
}

.skill-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.skill-level {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 4px;
    transition: width 1s ease-out;
}

/* Contact Section */
.contact-content {
    display: flex;
    justify-content: center;
    margin-top: 60px;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    width: 100%;
}

.contact-item {
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.contact-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.contact-item p,
.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 15px;
}

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

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

.social-links a {
    font-weight: 500;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 32px 0;
}

.footer p {
    margin: 0;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    
    .stat h3 {
        font-size: 28px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        padding-left: 40px;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-dot {
        left: -41px;
        width: 16px;
        height: 16px;
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
    
    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 16px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}