body {
    font-family: 'Inter', sans-serif;
    color: #333;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.container {
    padding: 40px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    text-align: center;
    max-width: 600px;
    width: 100%;
}
h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: #333;
}
p {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 10px;
}
.countdown {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}
.time-box {
    background-color: #f0f2f5; 
    padding: 20px;
    border-radius: 10px;
    min-width: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.time-box span {
    font-size: 3rem;
    font-weight: 700;
    color: #764ba2;
}
.time-box label {
    font-size: 1rem;
    color: #666;
    margin-top: 5px;
}
.birthday-message {
    display: none;
}
.birthday-message h2 {
    font-size: 3rem;
    color: #764ba2;
    animation: fadeIn 1s ease-in-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    .time-box {
        padding: 15px;
        min-width: 80px;
    }

    .time-box span {
        font-size: 2rem;
    }
}