@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap');

:root {
    --bg-color: #f8f9fa;
    --container-bg: #ffffff;
    --text-color: #212529;
    --heading-color: #007bff;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --ball-bg: #e9ecef;
    --ball-text: #495057;
    --ball-border: #ced4da;
}

:root.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --heading-color: #00aaff;
    --border-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --ball-bg: #333333;
    --ball-text: #ffffff;
    --ball-border: #444444;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 2.5rem 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow-color);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
    position: relative;
    max-width: 500px;
    width: 90%;
}

h1 {
    color: var(--heading-color);
    margin-bottom: 2rem;
    font-weight: 700;
    letter-spacing: 1px;
}

#theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--ball-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 0.8rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.3s;
}

#theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px var(--shadow-color);
}