@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --primary-color: #4a90e2;
    --background-color: #f0f4f8;
    --text-color: #333;
    --white-color: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --toggle-color: #333;
    --placeholder-bg: #e0e0e0;
}

[data-theme="dark"] {
    --primary-color: #5aa1f5;
    --background-color: #121212;
    --text-color: #e0e0e0;
    --white-color: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --toggle-color: #f0f4f8;
    --placeholder-bg: #333;
}

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

.container {
    background-color: var(--white-color);
    padding: 2rem 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

h1 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 2rem;
    transition: color 0.3s ease;
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.number-placeholder, .number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(145deg, #5aa1f5, #3a7bd5);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, background 0.3s ease;
}

.number-placeholder {
    background: var(--placeholder-bg);
}

#generate-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

#generate-btn:hover {
    background-color: #3a7bd5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.5);
}

#generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(74, 144, 226, 0.4);
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--toggle-color);
    padding: 10px;
    border-radius: 50%;
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: rgba(0,0,0,0.1);
}

[data-theme="dark"] .theme-toggle:hover {
    background-color: rgba(255,255,255,0.1);
}