:root {
    --primary-color: #ff6b35;
    --secondary-color: #f7c948;
    --background-color: #f5f4ef;
    --text-color: #1e1b18;
    --surface-color: #ffffff;
    --page-gradient: linear-gradient(135deg, #f2d2b1, #f1e7c6, #d9e8e3, #c8d8f3);
    --card-shadow: 0 12px 28px rgba(30, 27, 24, 0.12), 0 6px 14px rgba(30, 27, 24, 0.08);
    --ball-shadow: 0 6px 12px rgba(30, 27, 24, 0.18);
    --button-shadow: 0 8px 18px rgba(30, 27, 24, 0.18);
}

[data-theme="dark"] {
    --primary-color: #ff9f1c;
    --secondary-color: #2ec4b6;
    --background-color: #0f1115;
    --text-color: #eae7e2;
    --surface-color: #1c2128;
    --page-gradient: linear-gradient(135deg, #0f1115, #1c2128, #182b3a, #0b1e2b);
    --card-shadow: 0 18px 38px rgba(5, 7, 10, 0.6), 0 8px 18px rgba(5, 7, 10, 0.4);
    --ball-shadow: 0 10px 18px rgba(0, 0, 0, 0.45);
    --button-shadow: 0 10px 20px rgba(0, 0, 0, 0.45);
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: var(--page-gradient);
    transition: background-color 0.3s ease, color 0.3s ease, background-image 0.6s ease;
}

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--surface-color);
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    width: 90%;
    max-width: 500px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.header h1 {
    color: var(--primary-color);
    margin: 0;
    text-align: left;
}

#theme-toggle {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

#theme-toggle:hover {
    background-color: var(--text-color);
    color: var(--surface-color);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.lotto-ball {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    color: var(--surface-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    box-shadow: var(--ball-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#generate-btn {
    background-color: var(--primary-color);
    color: var(--surface-color);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--button-shadow);
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.35);
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    #theme-toggle {
        align-self: flex-end;
    }
}