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

:root {
    --primary-color: #3498db;
    --background-color-light: #f0f2f5;
    --text-color-light: #333;
    --container-bg-light: rgba(255, 255, 255, 0.5);
    --shadow-light: 0 10px 20px rgba(0,0,0,0.1);

    --background-color-dark: #2c3e50;
    --text-color-dark: #ecf0f1;
    --container-bg-dark: rgba(44, 62, 80, 0.8);
    --shadow-dark: 0 10px 20px rgba(0,0,0,0.3);

    --background-color: var(--background-color-light);
    --text-color: var(--text-color-light);
    --container-bg: var(--container-bg-light);
    --shadow: var(--shadow-light);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-image: linear-gradient(to right top, #d16ba5, #c777b9, #ba83ca, #aa8fd8, #9a9ae1, #8aa7ec, #79b3f4, #69bff8, #52cffe, #41dfff, #46eefa, #5ffbf1);
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    --background-color: var(--background-color-dark);
    --text-color: var(--text-color-dark);
    --container-bg: var(--container-bg-dark);
    --shadow: var(--shadow-dark);
}

.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 90%;
    width: 500px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

h1 {
    color: var(--primary-color);
    font-weight: 600;
    margin: 0;
}

.theme-switcher {
    position: relative;
}

#theme-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 5px;
}

#theme-toggle-btn svg {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}

#theme-toggle-btn:hover svg {
    transform: scale(1.2);
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.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;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.number:hover {
    transform: translateY(-5px);
}

#generate-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.6);
}

#generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}