:root {
    /* Color Palette - Cyber Dark Mode */
    --bg-primary: #0a0e17; /* Zeer donkerblauw/zwart */
    --bg-secondary: #111827;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-color: #00f0ff; /* Neon cyan */
    --accent-glow: rgba(0, 240, 255, 0.5);
    --accent-hover: #00bfff;
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-main: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    /* Subtle background gradient pattern */
    background-image: radial-gradient(circle at 15% 50%, rgba(0, 240, 255, 0.03), transparent 25%),
                      radial-gradient(circle at 85% 30%, rgba(0, 191, 255, 0.03), transparent 25%);
    background-attachment: fixed;
}

/* Typography elements */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.code-font {
    font-family: var(--font-code);
}

.accent {
    color: var(--accent-color);
}

/* Navigation */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--text-primary);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    position: relative;
}

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

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

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

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.1);
}

.btn-primary:hover {
    background-color: var(--accent-color);
    color: var(--bg-primary);
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-secondary {
    background-color: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 2rem;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.greeting {
    color: var(--accent-color);
    font-family: var(--font-code);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5rem);
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #9ca3af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    text-decoration: none;
    transition: var(--transition);
}

.scroll-indicator a:hover {
    color: var(--accent-color);
}

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

/* Common Section Styles */
.section-padding {
    padding: 100px 2rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    display: flex;
    align-items: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    height: 1px;
    width: 300px;
    background-color: var(--glass-border);
    margin-left: 1.5rem;
}

/* Glassmorphism Panel Utilities */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 2rem;
    transition: var(--transition);
}

.glass-panel:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: center;
}

.contact-details-list {
    margin-top: 1.5rem;
    list-style: none;
}

.contact-details-list li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.contact-details-list strong {
    color: var(--accent-color);
    margin-right: 0.5rem;
}

.about-card {
    position: relative;
}

.glass-card {
    background: linear-gradient(135deg, rgba(17, 24, 39, 0.8) 0%, rgba(10, 14, 23, 0.8) 100%);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
}

.hack-icon {
    font-size: 2.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.glass-card span {
    color: var(--accent-color);
}

.profile-image-container {
    width: 100%;
    max-width: 350px;
    margin: 0 auto;
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    border: 1px solid var(--glass-border);
}

.profile-image-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    z-index: 2;
}

.profile-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    transition: var(--transition);
}

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

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--glass-border);
    top: 0;
    bottom: 0;
    left: 20px;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 0 40px 50px;
    position: relative;
}

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    background-color: var(--accent-color);
    border: 4px solid var(--bg-primary);
    border-radius: 50%;
    left: 12px;
    top: 15px;
    z-index: 1;
    box-shadow: 0 0 10px var(--accent-glow);
}

.timeline-date {
    font-family: var(--font-code);
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    margin-bottom: 0.2rem;
    color: var(--text-primary);
    font-size: 1.3rem;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 1rem;
}

/* Education Grid */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.edu-card {
    position: relative;
    padding-top: 3rem;
}

.edu-icon {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2rem;
    color: var(--glass-border);
    transition: var(--transition);
}

.edu-card:hover .edu-icon {
    color: var(--accent-color);
    opacity: 0.5;
}

.edu-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.edu-card p {
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.edu-year {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--accent-color);
    background: rgba(0, 240, 255, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

/* Skills */
.skills-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.skill-category h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: rgba(0, 240, 255, 0.05);
    transform: translateY(-2px);
}

/* Contact */
.contact-subtitle {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: stretch;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: 100%;
}

.contact-info .contact-card {
    padding: 2rem 1.5rem;
    flex: 1; 
    display: flex;
    justify-content: center;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    height: 100%;
    justify-content: space-between;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    padding: 0.8rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-main);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
    background: rgba(17, 24, 39, 0.8);
}

.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 1rem;
    margin-top: 0.5rem;
}

.form-status {
    text-align: center;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.form-status.success {
    color: #10b981;
}

.form-status.error {
    color: #ef4444;
}

.contact-card {
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
}

.contact-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    transition: var(--transition);
}

.contact-card:hover i {
    transform: scale(1.1);
}

.contact-card h3 {
    margin-bottom: 0.5rem;
}

.contact-card p {
    margin-bottom: 0;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
}

footer p {
    font-family: var(--font-code);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Animations */
.hidden-element {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.show-element {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* In a real app we'd build a mobile menu, keeping simple for now */
    }
    
    .hamburger {
        display: block;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .section-title::after {
        width: 100px;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .skills-container {
        grid-template-columns: 1fr;
    }
}