:root {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --primary-color: #ff4081;
    --secondary-color: #7c4dff;
    --card-bg-color: #2a2a2a;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --glow-color: rgba(255, 64, 129, 0.8);
    --history-item-bg: #333;

    --font-main: 'Poppins', sans-serif;
}

body.light-mode {
    --bg-color: #f0f2f5;
    --text-color: #1a1a1a;
    --primary-color: #d81b60;
    --secondary-color: #6200ea;
    --card-bg-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(216, 27, 96, 0.3);
    --history-item-bg: #e4e6eb;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: grid;
    place-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='0.12'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.container {
    background-color: var(--card-bg-color);
    border-radius: 20px;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

#theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    background-color: var(--secondary-color);
    color: white;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 2.5rem;
    letter-spacing: 2px;
    text-shadow: 0 0 10px var(--glow-color);
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

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

#generate-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px var(--glow-color);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--glow-color);
}

.history {
    margin-top: 3rem;
}

.history h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    display: inline-block;
    transition: color 0.3s ease, border-color 0.3s ease;
}

#history-list {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

#history-list li {
    background-color: var(--history-item-bg);
    padding: 0.8rem;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-around;
    font-size: 1.1rem;
    transition: background-color 0.3s ease;
}