:root {
    --bg: #ffffff;
    --fg: #222;
    --accent: #4e9af1;
}

body.dark-mode {
    --bg: #121212;
    --fg: #f0f0f0;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: var(--bg);
    color: var(--fg);
    scroll-behavior: smooth;
}

.container {
    width: 90%;
    max-width: 800px;
    margin: auto;
    padding: 2rem 0;
}

.hero {
    background: var(--accent);
    color: white;
    text-align: center;
    padding: 4rem 2rem;
}

.hero h1 {
    font-size: 2.5rem;
}

.hero p {
    font-size: 1.2rem;
    margin-top: 1rem;
}

.btn {
    background: white;
    color: var(--accent);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 1.5rem;
    display: inline-block;
}

.section {
    background: var(--bg);
    color: var(--fg);
    padding: 3rem 0;
    border-bottom: 1px solid #ccc;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    padding: 0.5rem 0;
}

form {
    display: flex;
    flex-direction: column;
}

form input, form textarea {
    margin-bottom: 1rem;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
}

form button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
}

.footer {
    background: #eee;
    color: #333;
    text-align: center;
    padding: 1rem;
}

.dark-mode .footer {
    background: #222;
    color: #aaa;
}