* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    text-align: center;
}

h2 {
    color: #333;
    margin-bottom: 30px;
    font-size: 1.8rem;
}

.counter-display {
    margin: 30px 0;
}

#counter {
    display: inline-block;
    font-size: 4rem;
    font-weight: bold;
    color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 100px;
    transition: transform 0.2s ease;
}

#counter.pulse {
    animation: pulse 0.3s ease;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

button {
    font-size: 1.1rem;
    padding: 15px 40px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    margin: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #e0e0e0;
    color: #666;
}

.btn-secondary:hover {
    background: #d0d0d0;
    transform: translateY(-2px);
}

footer {
    text-align: center;
    color: white;
    margin-top: 30px;
    opacity: 0.8;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .card {
        padding: 30px 20px;
    }

    #counter {
        font-size: 3rem;
    }

    button {
        padding: 12px 30px;
        font-size: 1rem;
    }
}