:root {
    --bg-color: #0a0e17;
    --text-color: #e0e6ed;
    --accent-color: #4facfe;
    --accent-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --nav-bg: rgba(10, 14, 23, 0.95);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --gap: 2rem;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.menu-toggle {
    display: none;
}

/* Hero Section */
header#home {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 5%;
    /* Account for fixed header */
    position: relative;
    background-image: url('assets/parallax-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(10, 14, 23, 0.7), var(--bg-color));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
}

.hero-content h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
}

.hero-title {
    font-size: clamp(1rem, 2vw, 1.4rem);
    color: #fff;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hero-location {
    font-size: 1.1rem;
    color: #a0aec0;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--accent-gradient);
    color: #0a0e17;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(79, 172, 254, 0.3);
}

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

.cta-btn.secondary:hover {
    background: rgba(79, 172, 254, 0.1);
    box-shadow: 0 10px 20px rgba(79, 172, 254, 0.1);
}

/* Section Common */
section {
    padding: 6rem 5%;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

h2::after {
    content: '';
    display: block;
    width: 60%;
    height: 4px;
    background: var(--accent-gradient);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.15rem;
    color: #cbd5e0;
}

.about-content p {
    margin-bottom: 1.5rem;
}

/* Competencies Grid & Education */
.competencies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.competency-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, border-color 0.3s ease;
    height: 100%;
}

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

.competency-card h3 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    text-align: center;
}

.skill-list {
    list-style: none;
    text-align: left;
}

.skill-list li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
    color: #cbd5e0;
}

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

.skill-list.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    padding-left: 0;
}

.skill-list.tags li {
    background: rgba(79, 172, 254, 0.1);
    color: var(--accent-color);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: 0;
    padding-left: 1rem;
}

.skill-list.tags li::before {
    content: none;
}

.highlight {
    color: var(--accent-color);
    font-weight: 600;
}

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background: rgba(255, 255, 255, 0.1);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
    border-radius: 2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
    box-sizing: border-box;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item.left {
    left: 0;
}

.timeline-item.right {
    left: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--bg-color);
    border: 4px solid var(--accent-color);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.right::after {
    left: -10px;
}

.content {
    padding: 30px;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    position: relative;
}

.content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    pointer-events: none;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.content h3 {
    color: var(--accent-color);
    margin-bottom: 0.2rem;
    font-size: 1.4rem;
}

.content h4 {
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.content .year {
    font-size: 0.85rem;
    color: #8892b0;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    display: block;
    font-weight: 700;
}

.content ul {
    list-style: none;
    margin-top: 1rem;
}

.content ul li {
    margin-bottom: 0.5rem;
    color: #cbd5e0;
    font-size: 0.95rem;
    position: relative;
    padding-left: 1.2rem;
}

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

/* Contact Section */
.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.1rem;
}

.contact-item a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.2);
    font-size: 0.9rem;
    color: #8892b0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media screen and (max-width: 768px) {
    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .timeline-item::after {
        left: 21px;
    }

    .timeline-item.right {
        left: 0%;
    }

    /* Mobile Nav */
    .menu-toggle {
        display: block;
        cursor: pointer;
        z-index: 1001;
    }

    .bar {
        width: 25px;
        height: 3px;
        background-color: var(--text-color);
        margin: 5px 0;
        transition: 0.3s;
    }

    .nav-links {
        position: fixed;
        background: var(--nav-bg);
        height: 100vh;
        width: 100%;
        top: 0;
        left: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transform: translateY(-100%);
        transition: transform 0.3s ease-in-out;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    header#home {
        padding-top: 100px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }
}