@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swap');

:root, :root[data-theme='dark'] {
    --color-background: #1a1a1d;
    --color-text: #f0f0f0;
    --color-primary: #c3073f;
    --color-secondary: #950740;
    --color-accent: #6f2232;
    --color-ball-1: #fca311; /* Yellow */
    --color-ball-2: #14213d; /* Blue */
    --color-ball-3: #e63946; /* Red */
    --color-ball-4: #2a9d8f; /* Green */
    --color-ball-5: #8338ec; /* Purple */
    --background-image-opacity: 0.04;
}

:root[data-theme='light'] {
    --color-background: #f0f2f5;
    --color-text: #1a1a1d;
    --color-primary: #d90429;
    --color-secondary: #ef233c;
    --color-accent: #8d99ae;
    --color-ball-1: #fca311; /* Yellow */
    --color-ball-2: #14213d; /* Blue */
    --color-ball-3: #e63946; /* Red */
    --color-ball-4: #2a9d8f; /* Green */
    --color-ball-5: #8338ec; /* Purple */
    --background-image-opacity: 0.08;
}

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

main {
    padding: 2rem;
    background: rgba(42, 42, 48, 0.5);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

#theme-switcher-btn {
    font-size: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

#theme-switcher-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

h1 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 2rem;
    text-shadow: 0 0 5px var(--color-primary), 0 0 10px var(--color-primary);
}

#numbers-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2.5rem 0;
    flex-wrap: wrap;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3), 
                inset 0 -5px 10px rgba(0,0,0,0.4);
    text-shadow: 0 2px 3px rgba(0,0,0,0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#generate-btn {
    font-family: 'Inter', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    background: var(--color-primary);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3), 
                0 0 20px var(--color-primary), 
                inset 0 -3px 5px rgba(0,0,0,0.4);
    transition: all 0.3s ease;
}

#generate-btn:hover, #generate-btn:focus {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.4), 
                0 0 30px var(--color-primary), 
                inset 0 -3px 5px rgba(0,0,0,0.4);
    outline: none;
}

/* Responsive Design */
@media (max-width: 600px) {
    h1 {
        font-size: 2.2rem;
    }

    .number-ball {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    #generate-btn {
        font-size: 1rem;
        padding: 0.8rem 2rem;
    }
}