:root {
    --bg: #ffffff;
    --text: #1e293b;
    --card: #f1f5f9;
    --accent: #2563eb;
}

body.dark {
    --bg: #0f172a;
    --text: #e2e8f0;
    --card: #1e293b;
    --accent: #60a5fa;
}

body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    display: flex;
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.sidebar {
    width: 220px;
    background-color: var(--card);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    box-shadow: 4px 0 10px rgba(0, 0, 0, 0.05);
}

.sidebar h2 {
    margin-bottom: 20px;
    font-size: 1.4rem;
    color: var(--accent);
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 30px;
}

.sidebar nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: 0.2s;
}

.sidebar nav a:hover {
    color: var(--accent);
}

.sidebar button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

main {
    flex: 1;
    padding: 40px;
    display: flex;
    flex-direction: column;
}

#intro {
    max-width: 800px;
    margin-bottom: 40px;
}

#intro h1 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

#projects h2 {
    margin-bottom: 20px;
}

.card-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background-color: var(--card);
    color: var(--text);
    text-decoration: none;
    padding: 20px;
    border-radius: 12px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    transition: all 0.2s ease;
}

.card:hover {
    transform: translateY(-3px);
    background-color: var(--accent);
    color: white;
}

footer {
    margin-top: 60px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text);
}