* {
    box-sizing: border-box;
}

body{
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: #eceff1;
    font-family: "Segoe UI", Roboto, Arial, sans-serif;
}

.contain{
    width: 100%;
    max-width: 400px;
    background-color: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,.12);
}

/* Franja naranja de arriba, igual que el menu */
.encabezado{
    background: #ff8500;
    color: #ffffff;
    text-align: center;
    padding: 28px 20px 22px;
}
.ti{
    margin: 0;
    font-size: 30px;
    font-weight: 700;
    letter-spacing: 3px;
}
.subti{
    margin: 6px 0 0;
    font-size: 13px;
    opacity: .9;
}

.cuerpo{
    padding: 28px 28px 30px;
}
.instruccion{
    margin: 0 0 20px;
    text-align: center;
    font-size: 18px;
    color: #37474f;
}

/* Cada campo lleva su icono a la izquierda */
.campo{
    display: flex;
    align-items: center;
    margin-bottom: 14px;
    border: 1px solid #cfd8dc;
    border-radius: 8px;
    background: #ffffff;
    transition: border-color .15s, box-shadow .15s;
}
.campo:focus-within{
    border-color: #ff8500;
    box-shadow: 0 0 0 3px rgba(255,133,0,.18);
}
.campo svg{
    width: 20px;
    height: 20px;
    margin: 0 4px 0 14px;
    color: #ff8500;
    flex-shrink: 0;
}
.login-field {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: none;
    background: transparent;
    height: 44px;
    padding: 0 12px;
    font-family: inherit;
    font-size: 16px;
    color: #37474f;
}

.login{
    width: 100%;
    margin-top: 8px;
    cursor: pointer;
    color: #ffffff;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    padding: 12px;
    border: 0;
    background-color: #ff8500;
    transition: background-color .15s;
}
.login:hover{
    background-color: #e67700;
}
.login:active{
    background-color: #cc6a00;
}
.login:disabled{
    background-color: #b0bec5;
}

.error{
    margin: 16px 0 0;
    padding: 10px 12px;
    border-radius: 8px;
    background-color: #ffebee;
    border-left: 4px solid #c62828;
    color: #b71c1c;
    font-size: 14px;
    text-align: center;
}