*
{
    box-sizing: border-box;
}

body 
{
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.2s ease, color 0.2s ease;
}

:root
{
    --bg: #ffffff;
    --bg-secondary: #f5f5f5;
    --text: #111111;
    --text-muted: #555555;
    --border: #e5e7eb;
    --accent: #2563eb;
}

[data-theme="dark"] 
{
    --bg: #111827;
    --bg-secondary: #1f2937;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --border: #374151;
    --accent: #60a5fa;
}

.header
{
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.content
{
    padding: 1rem;
}

.card
{
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 8px;
}

a 
{
    color: var(--accent);
}