body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

main {
    background: #fff;
    padding: 2rem 3rem;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    text-align: center;
    width: 90%;
    max-width: 800px;
}

h1 {
    font-size: 36px;
    margin-bottom: 2rem;
    color: #007aff;
}

.clock-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.clock {
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
    transition: transform 0.2s;
}

.clock:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.city {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #555;
}

.time {
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Courier New', Courier, monospace;
    margin-bottom: 0.3rem;
    color: #000;
}

.date {
    font-size: 0.9rem;
    color: #888;
}

.controls {
    margin-top: 1rem;
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    background-color: #6c757d;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #5a6268;
}