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

:root {
    --bg-gradient: linear-gradient(135deg, #2d3561 0%, #3d4a7a 25%, #4a5f8f 50%, #6b5b95 75%, #8b5a8e 100%);
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-border: rgba(255, 255, 255, 0.2);
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --link-color: #67e8f9;
    --highlight: #fbbf24;
}

body.light {
    --bg-gradient: linear-gradient(135deg, #e0e7ff 0%, #ddd6fe 25%, #fce7f3 50%, #fce7f3 75%, #fce7f3 100%);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(0, 0, 0, 0.1);
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --link-color: #0891b2;
    --highlight: #ea580c;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 2px solid var(--text-primary);
}

#theme-toggle {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    transition: background 0.2s;
}

.nav-links a:hover {
    background: var(--card-bg);
}

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

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    margin: 3rem 0 8rem;
    text-align: center;
}

.profile-img {
    width: 280px;
    height: 280px;
    border-radius: 1rem;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.hero h2 {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.about, .contact {
    margin: 12rem 0;
}

.about h2, .contact h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    text-align: center;
    padding-bottom: 1rem;
    border-bottom: 1px dashed var(--card-border);
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    width: fit-content;
}

.badge.opengl { background: #8b5cf6; color: white; }
.badge.django { background: #10b981; color: white; }
.badge.rust { background: #c2410c; color: white; }
.badge.programming { background: #16a34a; color: white; }
.badge.technologies { background: #3b82f6; color: white; }
.badge.tools { background: #64748b; color: white; }
.badge.motorcycle { background: #991b1b; color: white; }
.badge.climbing { background: #0e7490; color: white; }
.badge.travelling { background: #7e22ce; color: white; }

.contact {
    text-align: center;
}

.contact-card {
    max-width: 600px;
    margin: 0 auto;
}

.contact-card p {
    margin: 1rem 0;
    font-size: 1.125rem;
}

.contact-card a {
    color: var(--link-color);
    text-decoration: underline;
}

.contact-card span {
    color: var(--highlight);
    text-decoration: underline;
}

@media (min-width: 768px) {
    .hero {
        flex-direction: row;
        text-align: left;
        margin: 6rem 0 12rem;
    }
    
    .hero-text {
        text-align: left;
    }
}

@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero h2 {
        font-size: 1.25rem;
    }
    
    .profile-img {
        width: 200px;
        height: 200px;
    }
    
    nav {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 0.5rem;
    }
    
    .nav-links a {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
}