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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --bg-color: #ffffff;
    --light-bg: #f8f9fa;
    --border-color: #e0e0e0;
    --link-color: #3498db;
    --link-hover: #2980b9;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    font-weight: 300;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1rem;
    color: #888;
    font-style: italic;
    margin-top: 0.5rem;
}

main {
    flex: 1;
}

section {
    margin-bottom: 2.5rem;
}

section h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: #555;
}

ul {
    list-style: none;
    padding-left: 0;
}

ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #555;
}

ul li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

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

.skill-category {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-top: 3px solid var(--secondary-color);
}

.skill-category h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.skill-category ul {
    margin: 0;
}

.skill-category ul li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
}

.project {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.project-logo {
    max-width: 60px;
    max-height: 60px;
    width: auto;
    height: auto;
    object-fit: contain;
}

.project h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0;
}

.project-description {
    margin-bottom: 1rem;
}

.project-link {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.project a {
    display: inline-block;
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    background-color: var(--bg-color);
    border-radius: 4px;
    border: 1px solid var(--link-color);
}

.project a:hover {
    color: var(--bg-color);
    background-color: var(--link-color);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.interests {
    background: linear-gradient(135deg, var(--light-bg) 0%, #ffffff 100%);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.contact-info {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: 6px;
    display: inline-block;
}

.contact-info strong {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.contact a {
    color: var(--link-color);
    text-decoration: none;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

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

.error-page {
    text-align: center;
    padding: 2rem 0;
}

.error-content {
    background-color: var(--light-bg);
    padding: 3rem 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    line-height: 1;
}

.error-content h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.error-content p {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1.5rem;
}

.error-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.home-button,
.contact-button {
    display: inline-block;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.home-button {
    background-color: var(--secondary-color);
    color: white;
    border: 2px solid var(--secondary-color);
}

.home-button:hover {
    background-color: var(--link-hover);
    border-color: var(--link-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.contact-button {
    background-color: var(--bg-color);
    color: var(--link-color);
    border: 2px solid var(--link-color);
}

.contact-button:hover {
    background-color: var(--link-color);
    color: var(--bg-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.helpful-links {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.helpful-links ul {
    margin-top: 1rem;
}

.helpful-links ul li {
    padding: 0.5rem 0;
}

.helpful-links a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.helpful-links a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

footer {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: #888;
    font-size: 0.9rem;
}

.footer-note {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: #aaa;
    font-style: italic;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
    
    section h2 {
        font-size: 1.3rem;
    }
    
    .container {
        padding: 1.5rem 1rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .project a {
        display: block;
        text-align: center;
    }
    
    .error-code {
        font-size: 4rem;
    }
    
    .error-content h3 {
        font-size: 1.5rem;
    }
    
    .error-actions {
        flex-direction: column;
    }
    
    .home-button,
    .contact-button {
        width: 100%;
        text-align: center;
    }
}