:root {
    --primary-text: #222;
    --secondary-text: #666;
    --background-color: #fcfcfc;
    --accent-color: #0070f3;
    --border-color: #eee;
    --card-bg: #fff;
    --tag-bg: #e9e9e9;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--primary-text);
    background-color: var(--background-color);
    padding: 0 1rem;
}

h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding-top: 2rem;
}

.section {
    padding: 3rem 0;
    margin-bottom: 1rem;
}

.header {
    background-color: var(--card-bg);
    padding: 5rem 0 3rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--secondary-text);
    margin-bottom: 0.5rem;
}

.slogan {
    font-style: italic;
    color: var(--secondary-text);
    margin-bottom: 2rem;
}

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

.link-item {
    color: var(--primary-text);
    text-decoration: none;
    font-weight: 400;
    padding: 0.25rem 0;
    transition: color 0.3s;
}

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

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

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.project-card h3 {
    color: var(--accent-color);
    margin-top: 0;
}

.project-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    margin-top: auto;
    display: inline-block;
}

.project-link:hover {
    text-decoration: underline;
}

.tags {
    margin: 1rem 0;
}

.tags span {
    display: inline-block;
    background-color: var(--tag-bg);
    color: var(--secondary-text);
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

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

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

.skills-grid li {
    margin-bottom: 0.5rem;
    color: var(--secondary-text);
}

.about-section p {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
}

.footer {
    background-color: var(--card-bg);
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
}

.footer p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.cta-button {
    background-color: var(--accent-color);
    color: #fff;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #005bb5;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .header {
        padding: 3rem 1rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

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

    .skills-grid > div {
        padding-bottom: 1rem;
    }
}