/* Dark Mode Variables */
:root {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --accent-color: #38bdf8;
    --card-bg: #1e293b;
    --button-hover: #0ea5e9;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    width: 100%;
    padding: 2rem 0;
    text-align: center;
    border-bottom: 1px solid #334155;
}

h1, h2 {
    color: #fff;
    margin-bottom: 1rem;
}

main {
    max-width: 800px;
    padding: 2rem;
    text-align: center;
}

.hero {
    margin: 4rem 0;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid #334155;
}

button {
    background: var(--accent-color);
    color: #000;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: var(--button-hover);
}