:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #8b5cf6;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

h1, h2, h3 { color: #ffffff; margin-bottom: 0.5em; }

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

a { color: var(--accent); text-decoration: none; font-weight: 600; }
a:hover { text-decoration: underline; }

pre {
    background: #0f172a;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #334155;
    overflow-x: auto;
    font-family: "Fira Code", monospace;
    font-size: 1rem;
}

input {
    width: 100%;
    padding: 12px;
    background: #0f172a;
    border: 1px solid #334155;
    color: white;
    border-radius: 8px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    border: none;
    color: white;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}

@media only screen and (max-width: 600px) {
    body { font-size: 1.2rem; }
    h1 { font-size: 2rem; }
}