:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --border-color: #30363d;
    --hover-border: #8b949e;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --transition-speed: 0.2s;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-stack);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Header */
.profile-header {
    margin-bottom: 4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-weight: 500;
}

.bio {
    color: var(--text-secondary);
    max-width: 600px;
    font-size: 1.1rem;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    text-decoration: none;
    transition: transform var(--transition-speed), border-color var(--transition-speed);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    border-color: var(--hover-border);
    transform: translateY(-2px);
}

.card-content h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.card-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Tags */
.tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.tag-c { color: #555; border-color: #555; }
.tag-cpp { color: #f34b7d; border-color: #f34b7d; }
.tag-rust { color: #dea584; border-color: #dea584; }
.tag-shell { color: #89e051; border-color: #89e051; }

.project-card:hover .tag {
    opacity: 1;
}

/* Footer */
footer {
    text-align: center;
    color: var(--text-secondary);
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px dashed var(--text-secondary);
}

footer a:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}