:root {
    --bg: #0f172a;
    --text: #f8fafc;
    --accent: #38bdf8;
    --card-bg: #1e293b;
}

body.light-mode {
    --bg: #f8fafc;
    --text: #0f172a;
    --card-bg: #e2e8f0;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.6;
    margin: 0;
    transition: background 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    padding: 2rem 10%;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 10%;
}

#hero {
    padding: 100px 0;
}

.highlight { color: var(--accent); }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
}

footer {
    text-align: center;
    padding: 100px 0;
}

a { color: var(--accent); text-decoration: none; }

#mode-toggle {
    background-color: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-family: inherit;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 2rem;
}

#mode-toggle:hover {
    background-color: var(--accent);
    color: var(--bg); /* Inverts the text color for contrast */
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

#mode-toggle:active {
    transform: scale(0.98);
}