* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    min-height: 100vh;
    background: linear-gradient(45deg, #1a1a1a, #2d2d2d);
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 20px;
}

.timer-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

h1 {
    color: #ffffff;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

input {
    padding: 1rem;
    border: none;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    text-align: center;
}

input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

button {
    padding: 1rem;
    border: none;
    border-radius: 10px;
    background: #4CAF50;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
}

button:hover {
    background: #45a049;
    transform: scale(1.02);
}

.timer-display {
    text-align: center;
    color: white;
}

#timeLeft {
    font-size: 4rem;
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}

.timer-label {
    font-size: 1.2rem;
    opacity: 0.8;
}

.pulse {
    animation: pulse 2s infinite;
}

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

.footer {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    margin-top: 2rem;
    font-family: 'Poppins', sans-serif;
}

/* Mobile Optimization */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .timer-card {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    #timeLeft {
        font-size: 3rem;
    }
    
    .timer-label {
        font-size: 1rem;
    }
}