:root {
    --bg-dark: #0a0a0a;
    --bg-darker: #050505;
    --text-light: #e0e0e0;
    --text-lighter: #f0f0f0;
    --accent: #00bcd4; /* Deep teal accent */
    --accent-dark: #0097a7;
    --bg-light: #f8f9fa;
    --text-dark: #212529;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--bg-dark);
    transition: var(--transition);
}

body.light-mode {
    --bg-dark: var(--bg-light);
    --bg-darker: #e9ecef;
    --text-light: var(--text-dark);
    --text-lighter: #495057;
    --accent: #00bcd4;
    --accent-dark: #0097a7;
    --border-color: rgba(0, 0, 0, 0.1);
}

.dark-mode-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    font: inherit;      
    padding: 0;         
    color: inherit;     
}

.dark-mode-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.dark-mode-toggle:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.dark-mode-toggle.light-mode {
    background-color: rgba(0, 0, 0, 0.1);
}

.dark-mode-toggle.light-mode:hover {
    background-color: rgba(0, 0, 0, 0.2);
}

.toggle-icon {
    font-size: 1.2rem;
}

header.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    position: relative;
    overflow: hidden;
}

header.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(0, 188, 212, 0.05) 0%, transparent 70%);
    animation: pulse 6s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.05); opacity: 0.7; }
}

.hero-content {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--text-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .title {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero .tagline {
    font-size: 1.2rem;
    color: var(--text-lighter);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.social-links a {
    color: var(--text-light);
    font-size: 1.5rem;
    transition: var(--transition);
}

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

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.section {
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: var(--bg-darker);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-lighter);
    position: relative;
    display: inline-block;
}

.section h2::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--accent);
}

.summary {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-lighter);
    max-width: 800px;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-item {
    border-left: 3px solid var(--accent);
    padding-left: 1.5rem;
    position: relative;
}

.timeline-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-lighter);
}

.timeline-item .date {
    font-size: 0.9rem;
    color: var(--accent);
    font-style: italic;
    margin-bottom: 1rem;
    display: block;
}

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

.timeline-item li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1rem;
}

.timeline-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.project-card {
    background-color: var(--bg-dark);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.project-card.featured {
    border: 2px solid var(--accent);
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
}

.project-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
    color: var(--text-lighter);
}

.project-card p {
    margin-bottom: 1rem;
    color: var(--text-lighter);
    line-height: 1.6;
}

.project-links {
    display: flex;
    gap: 0.75rem;
}

.btn {
    display: inline-block;
    background-color: var(--accent);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn:hover {
    background-color: var(--accent-dark);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--bg-dark);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-lighter);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: rgba(0, 188, 212, 0.1);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    border: 1px solid rgba(0, 188, 212, 0.2);
}

.education-certifications {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.education, .certifications {
    background-color: var(--bg-dark);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.education h3, .certifications h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-lighter);
}

.education p {
    font-size: 1.1rem;
    color: var(--text-lighter);
    line-height: 1.6;
}

.certifications ul {
    list-style: none;
}

.certifications li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-lighter);
}

.certifications li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.contact-info {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-dark);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.contact-info p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-lighter);
}

.contact-info .social-links {
    justify-content: center;
    margin-bottom: 1.5rem;
}

.credit {
    font-size: 0.9rem;
    color: rgba(224, 224, 224, 0.6);
    margin-top: 1.5rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero .title {
        font-size: 1.3rem;
    }
    
    .hero .tagline {
        font-size: 1rem;
    }
    
    .section {
        padding: 1.5rem;
    }
    
    .social-links {
        gap: 1rem;
    }
    
    .social-links a {
        font-size: 1.3rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .education-certifications {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 3rem 1rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero .title {
        font-size: 1.1rem;
    }
    
    .hero .tagline {
        font-size: 0.9rem;
    }
    
    .section h2 {
        font-size: 1.7rem;
    }
    
    .timeline-item h3 {
        font-size: 1.1rem;
    }
    
    .project-card h3 {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* Print stylesheet */
@media print {
    body {
        background-color: white !important;
        color: black !important;
    }
    
    .dark-mode-toggle,
    .social-links,
    .btn {
        display: none !important;
    }
    
    .badge {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-lighter);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    }

    .section {
        background-color: white !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
        margin-bottom: 2rem !important;
    }
    
    .hero {
        background: none !important;
        padding: 2rem 0 !important;
    }
    
    .hero h1 {
        -webkit-text-fill-color: black !important;
        background: none !important;
        -webkit-background-clip: initial !important;
    }
    
    .hero .title {
        color: #0066cc !important;
    }
    
    .accent, .tag {
        color: #0066cc !important;
    }
    
    .timeline-item li::before,
    .certifications li::before {
        color: #0066cc !important;
    }
    
    .section h2::after {
        background-color: #0066cc !important;
    }
}