/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Color Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-accent: #3b82f6;
    --color-gold: #f59e0b;
    
    /* Background Colors */
    --color-bg-primary: #0a0e27;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1f2937;
    --color-bg-card: #1a1f36;
    
    /* Text Colors */
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;
    
    /* Border & Divider */
    --color-border: #374151;
    --color-divider: #2d3748;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-primary: 'Montserrat', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed);
}

ul {
    list-style: none;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-dark {
    background-color: var(--color-bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: var(--spacing-sm) auto 0;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-speed);
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all var(--transition-speed);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-speed);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at top, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.hero-social {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    font-size: 1.5rem;
}

.hero-social a {
    color: var(--color-text-secondary);
    transition: all var(--transition-speed);
}

.hero-social a:hover {
    color: var(--color-primary);
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: var(--color-text-muted);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* ========================================
   About Section
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    border: 3px solid var(--color-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.about-text h3 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

/* ========================================
   Skills Section
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
}

.skill-category:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.skill-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.skill-list li {
    color: var(--color-text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
}

.skill-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

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

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

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg-secondary);
    z-index: 1;
}

.timeline-content {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
}

.timeline-content:hover {
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.timeline-header h3 {
    font-size: 1.4rem;
    color: var(--color-primary);
}

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

.timeline-content h4 {
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.timeline-body ul {
    list-style: none;
}

.timeline-body li {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
}

.timeline-body li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ========================================
   Projects Section
   ======================================== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    background-color: var(--color-bg-card);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-speed);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.2);
}

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-bg-tertiary);
}

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

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

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--color-primary);
    opacity: 0.3;
}

.project-info {
    padding: var(--spacing-lg);
}

.project-info h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.project-info p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 0.25rem 0.75rem;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--color-primary);
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

/* ========================================
   Education Section
   ======================================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.education-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-speed);
}

.education-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.education-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.education-card h3 {
    font-size: 1.3rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.education-card h4 {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.education-institution {
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

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

.education-highlights {
    margin-top: var(--spacing-md);
    text-align: left;
}

.education-highlights li {
    color: var(--color-text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
    margin-bottom: var(--spacing-xs);
}

.education-highlights li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ========================================
   Certifications Section
   ======================================== */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.certification-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-speed);
}

.certification-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.cert-logo {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.cert-logo img {
    max-height: 100%;
    width: auto;
}

.cert-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.certification-card h3 {
    font-size: 1.2rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.cert-issuer {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.cert-date,
.cert-expiry {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.cert-verify {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.cert-verify:hover {
    text-decoration: underline;
}

/* ========================================
   Achievements Section
   ======================================== */
.achievements-list {
    max-width: 900px;
    margin: 0 auto;
}

.achievement-item {
    display: flex;
    gap: var(--spacing-lg);
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-speed);
}

.achievement-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

.achievement-icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

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

.achievement-date {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

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

/* ========================================
   Contact Section
   ======================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 1.8rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-card);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
}

.contact-method:hover {
    border-color: var(--color-primary);
    transform: translateX(5px);
}

.contact-method i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.contact-form {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    transition: all var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--color-text-muted);
}

.footer-section h4 {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--color-text-muted);
    transition: color var(--transition-speed);
}

.footer-section ul li a:hover {
    color: var(--color-primary);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    font-size: 1.5rem;
}

.social-links a {
    color: var(--color-text-muted);
    transition: all var(--transition-speed);
}

.social-links a:hover {
    color: var(--color-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

/* ========================================
   Project Detail Page
   ======================================== */
.project-detail {
    padding-top: 120px;
    padding-bottom: var(--spacing-2xl);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-speed);
}

.back-link:hover {
    transform: translateX(-5px);
}

.project-content {
    max-width: 900px;
    margin: 0 auto;
}

.project-header {
    margin-bottom: var(--spacing-xl);
}

.project-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.project-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--color-text-muted);
}

.project-category {
    padding: 0.25rem 0.75rem;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--color-primary);
    border-radius: 4px;
    font-size: 0.9rem;
}

.tech-stack {
    margin-bottom: var(--spacing-xl);
}

.tech-stack h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-tag {
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.project-body {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.project-body h2 {
    color: var(--color-text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.project-body h3 {
    color: var(--color-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.project-body p {
    margin-bottom: var(--spacing-md);
}

.project-body ul,
.project-body ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.project-body ul {
    list-style: none;
}

.project-body ul li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.project-body ul li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.project-body ol {
    list-style: decimal;
}

.project-body code {
    background-color: var(--color-bg-card);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-primary);
}

.project-body pre {
    background-color: var(--color-bg-card);
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.project-body pre code {
    background: none;
    padding: 0;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-bg-secondary);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-speed);
        pointer-events: none;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        max-width: 300px;
        margin: 0 auto;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-marker {
        left: 1px;
    }
    
    .timeline-header {
        flex-direction: column;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .certifications-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .achievement-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .project-filters {
        flex-direction: column;
    }
    
    .filter-btn {
        width: 100%;
    }
}