body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: #f8f8f8;
    padding-top: 60px;
}

.btn {
    background: linear-gradient(45deg, #ff5722, #ff9800);
    color: white;
    padding: 16px 40px;
    border: none;
    border-radius: 50px;
    font-size: 22px;
    cursor: pointer;
    box-shadow: 0 6px 18px rgba(0,0,0,0.3);
    transition: 0.3s;
}

.btn:hover {
    transform: scale(1.08);
}

#timer {
    margin-top: 18px;
    font-size: 22px;
    font-weight: bold;
    color: #333;
}

.hidden {
    display: none;
}

/* Loading bar */
#progressContainer {
    width: 80%;
    height: 12px;
    background: #ddd;
    border-radius: 10px;
    margin: 25px auto;
    overflow: hidden;
    display: none;
}

#progressBar {
    height: 100%;
    width: 0%;
    background: linear-gradient(45deg, #ff9800, #ff5722);
    border-radius: 10px;
    transition: width 1s linear;
}