:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #475569;
    --border-color: #e2e8f0;
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding: 60px 0;
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border-radius: 24px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 8px;
    color: var(--text-main);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 24px;
}

.tagline {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 60px;
}

.about-section h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.about-text {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 800px;
}

.skills-section {
    margin-bottom: 80px;
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-chip {
    padding: 6px 16px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.skill-chip:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.projects-section h2 {
    margin-bottom: 32px;
    font-size: 1.75rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    border-color: #d1d5db;
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 700;
}

.project-card p {
    color: var(--text-muted);
    margin-bottom: 16px;
    font-size: 0.95rem;
    flex-grow: 1;
}

.highlight {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
}

.highlight::before {
    content: "→";
    margin-right: 8px;
}

.card-buttons {
    display: flex;
    gap: 12px;
}

.btn {
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-github {
    background-color: #1e293b;
    color: white;
}

.btn-github:hover {
    background-color: #000;
}

.btn-demo {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-demo:hover {
    background-color: var(--primary-color);
    color: white;
}

footer {
    text-align: center;
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 80px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.social-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
}