:root {
    --primary: #ea580c;
    --primary-dark: #c2410c;
    --secondary: #991b1b;
    --accent: #f97316;
    --text-dark: #1f1916;
    --text-light: #fef2f2;
    --bg-main: #ffffff;
    --bg-alt: #fff7ed;
    --border: #fed7aa;
}

* { scroll-behavior: smooth; }

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

.nav-bar {
    background: #ffffff;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    font-weight: 500;
    color: var(--primary-dark);
    text-decoration: none;
}

.nav-link:hover {
    background: var(--bg-alt);
    color: var(--secondary);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary);
}

.card {
    background: #ffffff;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    padding: 1.5rem;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    transform: translateY(-2px);
}

.project-card {
    background: #ffffff;
    border-left: 4px solid var(--primary);
    border-radius: 0.5rem;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.25s ease;
}

.project-card:hover {
    border-left-color: var(--secondary);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.project-meta {
    font-size: 0.85rem;
    color: var(--primary-dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.35rem;
}

.project-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 0.4rem;
}

.project-desc {
    font-size: 0.95rem;
    color: #4b5563;
    line-height: 1.55;
}

.project-link {
    font-size: 0.9rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.project-link:hover { color: var(--secondary); }

.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(234,88,12,0.25);
}

.footer {
    background: var(--secondary);
    color: #ffffff;
    padding: 2rem 0;
}

.footer a { color: #fdba74; text-decoration: none; }
.footer a:hover { color: #ffffff; }

.tag {
    display: inline-block;
    background: var(--bg-alt);
    color: var(--primary-dark);
    border: 1px solid var(--border);
    border-radius: 9999px;
    padding: 0.15rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: 0.4rem;
    margin-bottom: 0.4rem;
}