:root {
    --background-color: #f0f2f5;
    --text-color: #333333;
    --primary-color: #ff4081;
    --secondary-color: #7c4dff;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(255, 64, 129, 0.3);
}

body.dark-mode {
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --primary-color: #ff4081;
    --secondary-color: #7c4dff;
    --card-background: #2a2a2a;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --glow-color: rgba(255, 64, 129, 0.8);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px), 
                      linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

#theme-btn {
    background-color: var(--card-background);
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 10px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.container {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px var(--shadow-color);
    text-align: center;
    max-width: 600px;
    width: 90%;
    transition: background-color 0.3s ease;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.number {
    background-color: var(--secondary-color);
    color: #ffffff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.4rem;
    font-weight: bold;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.number.generated {
    transform: scale(1.1);
}

/* Number Range Colors */
.color-1-10 { background-color: #fbc02d; }
.color-11-20 { background-color: #1976d2; }
.color-21-30 { background-color: #d32f2f; }
.color-31-40 { background-color: #7b1fa2; }
.color-41-45 { background-color: #388e3c; }

#generate-btn {
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 5px 20px var(--glow-color);
    transition: all 0.3s ease;
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--glow-color);
}

#generate-btn:active {
    transform: translateY(0);
}