*{
    font-family: "Cascadia Mono", monospace;
}
body {
    background-color: #eefff2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.toggle-theme {
    position: fixed;
    left: 10px;
    bottom: 20px;
    z-index: 100;
    padding: 12px 20px;
    background-color: #79d191;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    color: #333;
}

.toggle-theme:hover {
    background-color: #5cb87c;
    transform: translateY(-2px);
}

.fancybut {
    width: 120px;
    padding: 12px 20px;
    margin: 20px 0;
    background-color: #89a293;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    color: #ffffff;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    align-self: flex-start;
}

.fancybut:hover {
    background-color: #77be8f;
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

.content-box {
    width: 90%;
    max-width: 600px;
    padding: 40px;
    margin: 20px auto;
    background-color: #93c9a8;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
    color: #2d3e3f;
    background: transparent;
}

p {
    font-size: 1.2em;
    color: #2d3e3f;
    background: transparent;
    line-height: 1.6;
}

/* Animation */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.content-box {
    animation: pulse 4s infinite ease-in-out;
}

/* Dark mode support */
body.dark-mode {
    background-color: #1a2e22;
}
body.dark-mode .content-box {
    background-color: #2d4a3a;
}
body.dark-mode h1, p {
    color: #e0f7e9;
}
body.dark-mode .fancybut {
    background-color: #3a5a4a;
}
body.dark-mode .fancybut:hover {
    background-color: #4d7a62;
}
body.dark-mode #toggle-theme {
    background-color: #4d7a62;
    color: white;
}
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .content-box {
        width: 85%;
        padding: 30px 20px;
        margin: 20px 0;
    }

    h1 {
        font-size: 1.8em;
        margin-bottom: 15px;
    }

    p {
        font-size: 1em;
    }

    /* Nút Quay Lại - phóng to và tối ưu */
    .fancybut {
        width: 100%;
        padding: 16px;
        font-size: 1.2em;
        margin: 15px 0;
        box-sizing: border-box;
        border-radius: 30px;
    }

    /* Nút Light/Dark Mode - phóng to và tối ưu vị trí */
    .toggle-theme {
        position: fixed;
        bottom: 7px;
        width: 90%;
        left: 2%;
        max-width: 250px;
        padding: 16px;
        font-size: 1.2em;
        margin-top: 0;
        border-radius: 30px;
    }
    .toggle-theme:hover {
        background-color: #5cb87c;
        transform: translateY(1px);
    }
    /* Hiệu ứng hover cho mobile (nếu cần) */
}