:root {
    --bg: #f0f2f5;
    --surface: #ffffff;
    --text: #1b1f24;
    --muted: #4b5563;
    --button-bg: #007bff;
    --button-bg-hover: #0056b3;
    --button-text: #ffffff;
    --ball-bg: #f8f9fa;
    --ball-border: #dee2e6;
    --shadow: 0 6px 14px rgba(0, 0, 0, 0.12);
}

body[data-theme="dark"] {
    --bg: #0b1020;
    --surface: #141b2d;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --button-bg: #22c55e;
    --button-bg-hover: #16a34a;
    --button-text: #0b1020;
    --ball-bg: #1f2937;
    --ball-border: #334155;
    --shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

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

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--surface);
    border-radius: 12px;
    box-shadow: var(--shadow);
    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: 2rem;
}

h1 {
    color: var(--text);
    margin: 0;
}

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

.button {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    color: var(--button-text);
    background-color: var(--button-bg);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: var(--button-bg-hover);
}

.toggle-btn {
    padding: 0.6rem 0.9rem;
    font-size: 0.9rem;
    background-color: transparent;
    color: var(--muted);
    border: 1px solid var(--muted);
}

.toggle-btn:hover {
    color: var(--text);
    border-color: var(--text);
}