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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #1a1a1a;
    color: #f0f0f0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

main {
    width: 100%;
    max-width: 400px;
    padding: 2rem 1.5rem;
}

h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #25d366;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

select {
    background-color: #2a2a2a;
    color: #f0f0f0;
    border: 1px solid #444;
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 1rem;
    flex-shrink: 0;
}

input[type="tel"] {
    background-color: #2a2a2a;
    color: #f0f0f0;
    border: 1px solid #444;
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 1.2rem;
    width: 100%;
    letter-spacing: 0.05em;
}

input[type="tel"]::placeholder {
    color: #666;
}

input[type="tel"]:focus,
select:focus {
    outline: none;
    border-color: #25d366;
}

button {
    width: 100%;
    padding: 0.9rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    background-color: #25d366;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

button:active {
    background-color: #1da851;
}