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

body {
    background-color: #f8fafc;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.pagina {
    text-align: center;
    width: 100%;
    max-width: 360px;
}

h1 {
    font-size: 28px;
    color: #0f172a;
    margin-bottom: 32px;
    letter-spacing: 1px;
}

.card-conversor {
    background-color: #0f172a;
    border: 2px solid #2563eb;
    border-radius: 8px;
    padding: 28px 24px;
    width: 100%;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.campo {
    margin-bottom: 20px;
    text-align: left;
}

.campo label {
    display: block;
    font-size: 14px;
    color: #e2e8f0;
    margin-bottom: 6px;
}

.campo input,
.campo select {
    width: 100%;
    padding: 10px 12px;
    background-color: #1e293b;
    border: 1px solid #334155;
    border-radius: 4px;
    color: #ffffff;
    font-size: 15px;
}

.campo input:focus,
.campo select:focus {
    outline: none;
    border-color: #3b82f6;
}

#btn-converter {
    width: 100%;
    background-color: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 11px 0;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

#btn-converter:hover {
    background-color: #1d4ed8;
}